效果图

参考

https://github.com/themerror/Win32Window

代码

Program.cs

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

using static CallWinApiDemo.CreateWindow;

namespace CallWinApiDemo;

// https://github.com/themerror/Win32Window
internal class Program
{
    private static IntPtr hinst;
    private static UInt16 atom;

    private static void Main(string[] args)
    {
        Main2(System.Diagnostics.Process.GetCurrentProcess().Handle, IntPtr.Zero, string.Empty, (int)ShowWindowCommands.Normal);
    }

    // Reference: https://docs.microsoft.com/en-us/windows/win32/winmsg/using-window-classes

    private static bool Main2(IntPtr hinstance, IntPtr hPrevInstance, string lpCmdLine, int nCmdShow)
    {
        MSG msg;

        if (!InitApplication(hinstance))
            return false;

        if (!InitInstance(hinstance, nCmdShow))
            return false;

        sbyte hasMessage;

        while ((hasMessage = Win32Api.GetMessage(out msg, IntPtr.Zero, 0, 0)) != 0 && hasMessage != -1)
        {
            Win32Api.TranslateMessage(ref msg);
            Win32Api.DispatchMessage(ref msg);
        }
        return msg.wParam == UIntPtr.Zero;
    }

    private static bool InitApplication(IntPtr hinstance)
    {
        WNDCLASSEX wcx = new WNDCLASSEX();

        wcx.cbSize = Marshal.SizeOf(wcx);
        wcx.style = (int)(ClassStyles.VerticalRedraw | ClassStyles.HorizontalRedraw);

        IntPtr address2 = Marshal.GetFunctionPointerForDelegate((Delegate)(WndProc)MainWndProc);
        wcx.lpfnWndProc = address2;

        wcx.cbClsExtra = 0;
        wcx.cbWndExtra = 0;
        wcx.hInstance = hinstance;
        wcx.hIcon = Win32Api.LoadIcon(
                IntPtr.Zero, new IntPtr((int)2));
        wcx.hCursor = Win32Api.LoadCursor(IntPtr.Zero, (int)Win32_IDC_Constants.IDC_ARROW);
        wcx.hbrBackground = Win32Api.GetStockObject(StockObjects.WHITE_BRUSH);
        wcx.lpszMenuName = "MainMenu";
        wcx.lpszClassName = "MainWClass";

        UInt16 ret = Win32Api.RegisterClassEx2(ref wcx);
        if (ret != 0)
        {
            string message = new Win32Exception(Marshal.GetLastWin32Error()).Message;
            Console.WriteLine("调用 RegisterClasEx 失败, error = {0}", message);
        }
        atom = ret;
        return ret != 0;
    }

    private static bool InitInstance(IntPtr hInstance, int nCmdShow)
    {
        IntPtr hwnd;

        hinst = hInstance;
        hwnd = Win32Api.CreateWindowEx2(
            0,
            atom,                               // 窗口类名
            "Sample",                           // 标题栏字符串
            WindowStyles.WS_OVERLAPPEDWINDOW,   // top-level window 
            Win32_CW_Constant.CW_USEDEFAULT,    // 0 horizontal position 
            Win32_CW_Constant.CW_USEDEFAULT,    // 0 vertical position 
            400,                                // 400 宽 
            300,                                // 300 高 
            IntPtr.Zero,                        // no owner window 
            IntPtr.Zero,                        // use class menu 
            hInstance,                          // handle to application instance 
            IntPtr.Zero);                       // no window-creation data 
        if (hwnd == IntPtr.Zero)
        {
            string error = new Win32Exception(Marshal.GetLastWin32Error()).Message;
            Console.WriteLine("初始化实例 失败, error = {0}", error);
            return false;
        }
        Win32Api.ShowWindow(hwnd, (ShowWindowCommands)nCmdShow);
        Win32Api.UpdateWindow(hwnd);
        return true;
    }

    private static IntPtr MainWndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam)
    {
        IntPtr hdc;
        PAINTSTRUCT ps;
        RECT rect;
        switch ((WM)msg)
        {
            case WM.PAINT:
                hdc = Win32Api.BeginPaint(hWnd, out ps);
                Win32Api.GetClientRect(hWnd, out rect);
                Win32Api.DrawText(hdc, "Hello, Win 32!", -1, ref rect, Win32_DT_Constant.DT_SINGLELINE | Win32_DT_Constant.DT_CENTER | Win32_DT_Constant.DT_VCENTER);
                Win32Api.EndPaint(hWnd, ref ps);
                return IntPtr.Zero;
                break;

            case WM.DESTROY:
                Win32Api.PostQuitMessage(0);
                return IntPtr.Zero;
                break;
        }

        return Win32Api.DefWindowProc(hWnd, (WM)msg, wParam, lParam);
    }
}
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CreateWindow.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace CallWinApiDemo;

public class CreateWindow
{
    //ClassStyle, which are the enum values that dictate how the registered window classes render and etc...It has the following values.
    // http://www.pinvoke.net/default.aspx/Enums/ClassStyles.html
    [Flags]
    public enum ClassStyles : uint
    {
        /// 

        /// Aligns the window's client area on a byte boundary (in the x direction). This style
        /// affects the width of the window and its horizontal placement on the display.
        /// 
        ByteAlignClient = 0x1000,

        /// 

        /// Aligns the window on a byte boundary (in the x direction). This style affects the width
        /// of the window and its horizontal placement on the display.
        /// 
        ByteAlignWindow = 0x2000,

        /// 

        /// Allocates one device context to be shared by all windows in the class. Because window
        /// classes are process specific, it is possible for multiple threads of an application to
        /// create a window of the same class. It is also possible for the threads to attempt to use
        /// the device context simultaneously. When this happens, the system allows only one thread
        /// to successfully finish its drawing operation.
        /// 
        ClassDC = 0x40,

        /// 

        /// Sends a double-click message to the window procedure when the user double-clicks the
        /// mouse while the cursor is within a window belonging to the class.
        /// 
        DoubleClicks = 0x8,

        /// 

        /// Enables the drop shadow effect on a window. The effect is turned on and off through
        /// SPI_SETDROPSHADOW. Typically, this is enabled for small, short-lived windows such as
        /// menus to emphasize their Z order relationship to other windows.
        /// 
        DropShadow = 0x20000,

        /// 

        /// Indicates that the window class is an application global class. For more information,
        /// see the "Application Global Classes" section of About Window Classes.
        /// 
        GlobalClass = 0x4000,

        /// 

        /// Redraws the entire window if a movement or size adjustment changes the width of the
        /// client area.
        /// 
        HorizontalRedraw = 0x2,

        /// 

        /// Disables Close on the window menu.
        /// 
        NoClose = 0x200,

        /// 

        /// Allocates a unique device context for each window in the class.
        /// 
        OwnDC = 0x20,

        /// 

        /// Sets the clipping rectangle of the child window to that of the parent window so that the
        /// child can draw on the parent. A window with the CS_PARENTDC style bit receives a regular
        /// device context from the system's cache of device contexts. It does not give the child
        /// the parent's device context or device context settings. Specifying CS_PARENTDC enhances
        /// an application's performance.
        /// 
        ParentDC = 0x80,

        /// 

        /// Saves, as a bitmap, the portion of the screen image obscured by a window of this class.
        /// When the window is removed, the system uses the saved bitmap to restore the screen
        /// image, including other windows that were obscured. Therefore, the system does not send
        /// WM_PAINT messages to windows that were obscured if the memory used by the bitmap has not
        /// been discarded and if other screen actions have not invalidated the stored image. This
        /// style is useful for small windows (for example, menus or dialog boxes) that are
        /// displayed briefly and then removed before other screen activity takes place. This style
        /// increases the time required to display the window, because the system must first
        /// allocate memory to store the bitmap.
        /// 
        SaveBits = 0x800,

        /// 

        /// Redraws the entire window if a movement or size adjustment changes the height of the
        /// client area.
        /// 
        VerticalRedraw = 0x1
    }

    // check on this page: http://www.pinvoke.net/default.aspx/Enums/MessageBoxOptions.html
    ///

    /// Flags that define appearance and behaviour of a standard message box displayed by a call to the MessageBox function.
    /// 
    [Flags]
    public enum MessageBoxOptions : uint
    {
        OkOnly = 0x000000,
        OkCancel = 0x000001,
        AbortRetryIgnore = 0x000002,
        YesNoCancel = 0x000003,
        YesNo = 0x000004,
        RetryCancel = 0x000005,
        CancelTryContinue = 0x000006,
        IconHand = 0x000010,
        IconQuestion = 0x000020,
        IconExclamation = 0x000030,
        IconAsterisk = 0x000040,
        UserIcon = 0x000080,
        IconWarning = IconExclamation,
        IconError = IconHand,
        IconInformation = IconAsterisk,
        IconStop = IconHand,
        DefButton1 = 0x000000,
        DefButton2 = 0x000100,
        DefButton3 = 0x000200,
        DefButton4 = 0x000300,
        ApplicationModal = 0x000000,
        SystemModal = 0x001000,
        TaskModal = 0x002000,
        Help = 0x004000,
        NoFocus = 0x008000,
        SetForeground = 0x010000,
        DefaultDesktopOnly = 0x020000,
        Topmost = 0x040000,
        Right = 0x080000,
        RTLReading = 0x100000
    }

    // check on this page: http://www.pinvoke.net/default.aspx/Enums/MessageBoxResult.html
    /// 

    /// Represents possible values returned by the MessageBox function.
    /// 
    public enum MessageBoxResult : uint
    {
        Ok = 1,
        Cancel,
        Abort,
        Retry,
        Ignore,
        Yes,
        No,
        Close,
        Help,
        TryAgain,
        Continue,
        Timeout = 32000
    }

    //typedef struct tagMSG {
    //  HWND   hwnd;
    //  UINT   message;
    //  WPARAM wParam;
    //  LPARAM lParam;
    //  DWORD  time;
    //  POINT  pt;
    //} MSG, *PMSG, *LPMSG;

    // MSG structure http://msdn.microsoft.com/en-us/library/windows/desktop/ms644958(v=vs.85).aspx
    [StructLayout(LayoutKind.Sequential, Pack = 8)]
    public struct MSG
    {
        public IntPtr hwnd;
        public UInt32 message;
        public UIntPtr wParam;
        public UIntPtr lParam;
        public UInt32 time;
        public POINT pt;
    }

    //The PAINTSTRUCT is the strucute use by the GDI function BegingPaint and EndPaint function call.
    // http://www.pinvoke.net/default.aspx/Structures/PAINTSTRUCT.html
    [StructLayout(LayoutKind.Sequential)]
    public struct PAINTSTRUCT
    {
        public IntPtr hdc;
        public bool fErase;
        public RECT rcPaint;
        public bool fRestore;
        public bool fIncUpdate;

        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
        public byte[] rgbReserved;
    }

    //typedef struct tagPOINT {
    //  LONG x;
    //  LONG y;
    //} POINT, *PPOINT;
    public struct POINT
    {
        public Int32 x;
        public Int32 Y;
    }


    // http://www.pinvoke.net/default.aspx/Structures/RECT.html
    [StructLayout(LayoutKind.Sequential)]
    public struct RECT
    {
        public int Left, Top, Right, Bottom;

        public RECT(int left, int top, int right, int bottom)
        {
            Left = left;
            Top = top;
            Right = right;
            Bottom = bottom;
        }

        public RECT(System.Drawing.Rectangle r) : this(r.Left, r.Top, r.Right, r.Bottom)
        {
        }

        public int X
        {
            get { return Left; }
            set { Right -= (Left - value); Left = value; }
        }

        public int Y
        {
            get { return Top; }
            set { Bottom -= (Top - value); Top = value; }
        }

        public int Height
        {
            get { return Bottom - Top; }
            set { Bottom = value + Top; }
        }

        public int Width
        {
            get { return Right - Left; }
            set { Right = value + Left; }
        }

        public System.Drawing.Point Location
        {
            get { return new System.Drawing.Point(Left, Top); }
            set { X = value.X; Y = value.Y; }
        }

        public System.Drawing.Size Size
        {
            get { return new System.Drawing.Size(Width, Height); }
            set { Width = value.Width; Height = value.Height; }
        }

        public static implicit operator System.Drawing.Rectangle(RECT r)
        {
            return new System.Drawing.Rectangle(r.Left, r.Top, r.Width, r.Height);
        }

        public static implicit operator RECT(System.Drawing.Rectangle r)
        {
            return new RECT(r);
        }

        public static bool operator ==(RECT r1, RECT r2)
        {
            return r1.Equals(r2);
        }

        public static bool operator !=(RECT r1, RECT r2)
        {
            return !r1.Equals(r2);
        }

        public bool Equals(RECT r)
        {
            return r.Left == Left && r.Top == Top && r.Right == Right && r.Bottom == Bottom;
        }

        public override bool Equals(object obj)
        {
            if (obj is RECT)
                return Equals((RECT)obj);
            else if (obj is System.Drawing.Rectangle)
                return Equals(new RECT((System.Drawing.Rectangle)obj));
            return false;
        }

        public override int GetHashCode()
        {
            return ((System.Drawing.Rectangle)this).GetHashCode();
        }

        public override string ToString()
        {
            return string.Format(System.Globalization.CultureInfo.CurrentCulture, "{{Left={0},Top={1},Right={2},Bottom={3}}}", Left, Top, Right, Bottom);
        }
    }


    //the ShowWindowCommands enum, which feeds to the call ShowWindow, dictate how the window will be displayed.

    // http://www.pinvoke.net/default.aspx/Enums/ShowWindowCommand.html
    public enum ShowWindowCommands : int
    {
        /// 

        /// Hides the window and activates another window.
        /// 
        Hide = 0,

        /// 

        /// Activates and displays a window. If the window is minimized or maximized, the system
        /// restores it to its original size and position. An application should specify this flag
        /// when displaying the window for the first time.
        /// 
        Normal = 1,

        /// 

        /// Activates the window and displays it as a minimized window.
        /// 
        ShowMinimized = 2,

        /// 

        /// Maximizes the specified window.
        /// 
        Maximize = 3, // is this the right value?

        /// 

        /// Activates the window and displays it as a maximized window.
        /// 
        ShowMaximized = 3,

        /// 

        /// Displays a window in its most recent size and position. This value is similar to 
        /// cref="Win32.ShowWindowCommand.Normal"/>, except the window is not activated.
        /// 
        ShowNoActivate = 4,

        /// 

        /// Activates the window and displays it in its current size and position.
        /// 
        Show = 5,

        /// 

        /// Minimizes the specified window and activates the next top-level window in the Z order.
        /// 
        Minimize = 6,

        /// 

        /// Displays the window as a minimized window. This value is similar to 
        /// cref="Win32.ShowWindowCommand.ShowMinimized"/>, except the window is not activated.
        /// 
        ShowMinNoActive = 7,

        /// 

        /// Displays the window in its current size and position. This value is similar to 
        /// cref="Win32.ShowWindowCommand.Show"/>, except the window is not activated.
        /// 
        ShowNA = 8,

        /// 

        /// Activates and displays the window. If the window is minimized or maximized, the system
        /// restores it to its original size and position. An application should specify this flag
        /// when restoring a minimized window.
        /// 
        Restore = 9,

        /// 

        /// Sets the show state based on the SW_* value specified in the STARTUPINFO structure
        /// passed to the CreateProcess function by the program that started the application.
        /// 
        ShowDefault = 10,

        /// 

        /// Windows 2000/XP: Minimizes a window, even if the thread that owns the window is
        /// not responding. This flag should only be used when minimizing windows from a different thread.
        /// 
        ForceMinimize = 11
    }

    // Check on this page : http://www.pinvoke.net/default.aspx/gdi32/GetStockObject.html for the
    public enum StockObjects
    {
        WHITE_BRUSH = 0,
        LTGRAY_BRUSH = 1,
        GRAY_BRUSH = 2,
        DKGRAY_BRUSH = 3,
        BLACK_BRUSH = 4,
        NULL_BRUSH = 5,
        HOLLOW_BRUSH = NULL_BRUSH,
        WHITE_PEN = 6,
        BLACK_PEN = 7,
        NULL_PEN = 8,
        OEM_FIXED_FONT = 10,
        ANSI_FIXED_FONT = 11,
        ANSI_VAR_FONT = 12,
        SYSTEM_FONT = 13,
        DEVICE_DEFAULT_FONT = 14,
        DEFAULT_PALETTE = 15,
        SYSTEM_FIXED_FONT = 16,
        DEFAULT_GUI_FONT = 17,
        DC_BRUSH = 18,
        DC_PEN = 19,
    }

    // Did not find the the definition, thought this is for value -1
    public static class Win32_CW_Constant
    {
        //public const int CW_USEDEFAULT = (int)0x80000000;
        public const int CW_USEDEFAULT = -1;
    }

    //To show you how this Win32_CW_Constants is used, chck on the following code snippet.
#if false
	IntPtr hwnd = Win32Api.CreateWindowEx2(
			0,
			regRest,
			"The hello proram",
			WindowStyles.WS_OVERLAPPEDWINDOW,
			Win32_CW_Constant.CW_USEDEFAULT,
			Win32_CW_Constant.CW_USEDEFAULT,
			Win32_CW_Constant.CW_USEDEFAULT,
			Win32_CW_Constant.CW_USEDEFAULT,
			IntPtr.Zero,
			IntPtr.Zero,
			hInstance,
			IntPtr.Zero);
#endif

    // Check on this page: http://www.pinvoke.net/default.aspx/user32/DrawText.html for the DrawText constants.
    public static class Win32_DT_Constant
    {
        public const int DT_TOP = 0x00000000;

        public const int DT_LEFT = 0x00000000;

        public const int DT_CENTER = 0x00000001;

        public const int DT_RIGHT = 0x00000002;

        public const int DT_VCENTER = 0x00000004;

        public const int DT_BOTTOM = 0x00000008;

        public const int DT_WORDBREAK = 0x00000010;

        public const int DT_SINGLELINE = 0x00000020;

        public const int DT_EXPANDTABS = 0x00000040;

        public const int DT_TABSTOP = 0x00000080;

        public const int DT_NOCLIP = 0x00000100;

        public const int DT_EXTERNALLEADING = 0x00000200;

        public const int DT_CALCRECT = 0x00000400;

        public const int DT_NOPREFIX = 0x00000800;

        public const int DT_INTERNAL = 0x00001000;
    }

    // check on this page on the IDC_ constants http://www.pinvoke.net/default.aspx/Constants/IDC_.html
    public static class Win32_IDC_Constants
    {
        public const int
         IDC_ARROW = 32512,
         IDC_IBEAM = 32513,
         IDC_WAIT = 32514,
         IDC_CROSS = 32515,
         IDC_UPARROW = 32516,
         IDC_SIZE = 32640,
         IDC_ICON = 32641,
         IDC_SIZENWSE = 32642,
         IDC_SIZENESW = 32643,
         IDC_SIZEWE = 32644,
         IDC_SIZENS = 32645,
         IDC_SIZEALL = 32646,
         IDC_NO = 32648,
         IDC_HAND = 32649,
         IDC_APPSTARTING = 32650,
         IDC_HELP = 32651;
    }

    public static class Win32Api
    {
        // Messagae pump with C# and p/invke please check out https://docs.microsoft.com/en-us/windows/win32/winmsg/using-messages-and-message-queues
        //
        // General Reference Page: http://www.pinvoke.net
        [DllImport("user32.dll")]
        public static extern IntPtr DispatchMessage([In] ref MSG lpmsg);

        [DllImport("user32.dll")]
        public static extern bool TranslateMessage([In] ref MSG lpMsg);

        [DllImport("user32.dll")]
        public static extern sbyte GetMessage(out MSG lpMsg, IntPtr hWnd, uint wMsgFilterMin,
           uint wMsgFilterMax);

        public static IntPtr CreateWindow(
           string lpClassName,
           string lpWindowName,
           WindowStyles dwStyle,
           int x,
           int y,
           int nWidth,
           int nHeight,
           IntPtr hWndParent,
           IntPtr hMenu,
           IntPtr hInstance,
           IntPtr lpParam)
        {
            return CreateWindowEx(
                0,
                lpClassName,
                lpWindowName,
                dwStyle,
                x,
                y,
                nWidth,
                nHeight,
                hWndParent,
                hMenu,
                hInstance, lpParam);
        }

        // To use CreateWindow, just pass 0 as the first argument.
        [DllImport("user32.dll", SetLastError = true, EntryPoint = "CreateWindowEx")]
        public static extern IntPtr CreateWindowEx(
           WindowStylesEx dwExStyle,
           string lpClassName,
           string lpWindowName,
           WindowStyles dwStyle,
           int x,
           int y,
           int nWidth,
           int nHeight,
           IntPtr hWndParent,
           IntPtr hMenu,
           IntPtr hInstance,
           IntPtr lpParam);

        // Create a window, but accept a atom value.
        [DllImport("user32.dll", SetLastError = true, EntryPoint = "CreateWindowEx")]
        public static extern IntPtr CreateWindowEx2(
           WindowStylesEx dwExStyle,
           UInt16 lpClassName,
           string lpWindowName,
           WindowStyles dwStyle,
           int x,
           int y,
           int nWidth,
           int nHeight,
           IntPtr hWndParent,
           IntPtr hMenu,
           IntPtr hInstance,
           IntPtr lpParam);

        [DllImport("user32.dll")]
        public static extern ushort RegisterClass([In] ref WNDCLASS lpWndClass);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool ShowWindow(IntPtr hWnd, ShowWindowCommands nCmdShow);

        [DllImport("user32.dll")]
        public static extern IntPtr BeginPaint(IntPtr hwnd, out PAINTSTRUCT lpPaint);

        [DllImport("user32.dll")]
        public static extern IntPtr DefWindowProc(IntPtr hWnd, WM uMsg, IntPtr wParam, IntPtr lParam);

        [DllImport("user32.dll")]
        public static extern bool GetClientRect(IntPtr hWnd, out RECT lpRect);

        [DllImport("user32.dll")]
        public static extern int DrawText(IntPtr hDC, string lpString, int nCount, ref RECT lpRect, uint uFormat);

        [DllImport("user32.dll")]
        public static extern bool EndPaint(IntPtr hWnd, [In] ref PAINTSTRUCT lpPaint);

        [DllImport("user32.dll")]
        public static extern void PostQuitMessage(int nExitCode);

        [DllImport("user32.dll")]
        public static extern IntPtr LoadIcon(IntPtr hInstance, string lpIconName);

        [DllImport("user32.dll")]
        public static extern IntPtr LoadIcon(IntPtr hInstance, IntPtr lpIConName);

        [DllImport("gdi32.dll")]
        public static extern IntPtr GetStockObject(StockObjects fnObject);

        [DllImport("user32.dll")]
        public static extern MessageBoxResult MessageBox(IntPtr hWnd, string text, string caption, int options);

        [DllImport("user32.dll")]
        public static extern bool UpdateWindow(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern IntPtr LoadCursor(IntPtr hInstance, int lpCursorName);

        [DllImport("user32.dll")]
        public static extern short RegisterClassEx([In] ref WNDCLASSEX lpwcx);

        [DllImport("user32.dll", SetLastError = true, EntryPoint = "RegisterClassEx")]
        public static extern UInt16 RegisterClassEx2([In] ref WNDCLASSEX lpwcx);
    }

    // Window Style https://docs.microsoft.com/en-us/windows/win32/winmsg/window-styles?redirectedfrom=MSDN

    // http://www.pinvoke.net/default.aspx/Enums/WindowStyles.html
    /// 

    /// Window Styles. The following styles can be specified wherever a window style is required.
    /// After the control has been created, these styles cannot be modified, except as noted.
    /// 
    [Flags()]
    public enum WindowStyles : uint
    {
        /// 

        /// The window has a thin-line border.
        /// 
        WS_BORDER = 0x800000,

        /// 

        /// The window has a title bar (includes the WS_BORDER style).
        /// 
        WS_CAPTION = 0xc00000,

        /// 

        /// The window is a child window. A window with this style cannot have a menu bar. This
        /// style cannot be used with the WS_POPUP style.
        /// 
        WS_CHILD = 0x40000000,

        /// 

        /// Excludes the area occupied by child windows when drawing occurs within the parent
        /// window. This style is used when creating the parent window.
        /// 
        WS_CLIPCHILDREN = 0x2000000,

        /// 

        /// Clips child windows relative to each other; that is, when a particular child window
        /// receives a WM_PAINT message, the WS_CLIPSIBLINGS style clips all other overlapping child
        /// windows out of the region of the child window to be updated. If WS_CLIPSIBLINGS is not
        /// specified and child windows overlap, it is possible, when drawing within the client area
        /// of a child window, to draw within the client area of a neighboring child window.
        /// 
        WS_CLIPSIBLINGS = 0x4000000,

        /// 

        /// The window is initially disabled. A disabled window cannot receive input from the user.
        /// To change this after a window has been created, use the EnableWindow function.
        /// 
        WS_DISABLED = 0x8000000,

        /// 

        /// The window has a border of a style typically used with dialog boxes. A window with this
        /// style cannot have a title bar.
        /// 
        WS_DLGFRAME = 0x400000,

        /// 

        /// The window is the first control of a group of controls. The group consists of this first
        /// control and all controls defined after it, up to the next control with the WS_GROUP
        /// style. The first control in each group usually has the WS_TABSTOP style so that the user
        /// can move from group to group. The user can subsequently change the keyboard focus from
        /// one control in the group to the next control in the group by using the direction keys.
        /// You can turn this style on and off to change dialog box navigation. To change this style
        /// after a window has been created, use the SetWindowLong function.
        /// 
        WS_GROUP = 0x20000,

        /// 

        /// The window has a horizontal scroll bar.
        /// 
        WS_HSCROLL = 0x100000,

        /// 

        /// The window is initially maximized.
        /// 
        WS_MAXIMIZE = 0x1000000,

        /// 

        /// The window has a maximize button. Cannot be combined with the WS_EX_CONTEXTHELP style.
        /// The WS_SYSMENU style must also be specified.
        /// 
        WS_MAXIMIZEBOX = 0x10000,

        /// 

        /// The window is initially minimized.
        /// 
        WS_MINIMIZE = 0x20000000,

        /// 

        /// The window has a minimize button. Cannot be combined with the WS_EX_CONTEXTHELP style.
        /// The WS_SYSMENU style must also be specified.
        /// 
        WS_MINIMIZEBOX = 0x20000,

        /// 

        /// The window is an overlapped window. An overlapped window has a title bar and a border.
        /// 
        WS_OVERLAPPED = 0x0,

        /// 

        /// The window is an overlapped window.
        /// 
        WS_OVERLAPPEDWINDOW = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_SIZEFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,

        /// 

        /// The window is a pop-up window. This style cannot be used with the WS_CHILD style.
        /// 
        WS_POPUP = 0x80000000u,

        /// 

        /// The window is a pop-up window. The WS_CAPTION and WS_POPUPWINDOW styles must be combined
        /// to make the window menu visible.
        /// 
        WS_POPUPWINDOW = WS_POPUP | WS_BORDER | WS_SYSMENU,

        /// 

        /// The window has a sizing border.
        /// 
        WS_SIZEFRAME = 0x40000,

        /// 

        /// The window has a window menu on its title bar. The WS_CAPTION style must also be specified.
        /// 
        WS_SYSMENU = 0x80000,

        /// 

        /// The window is a control that can receive the keyboard focus when the user presses the
        /// TAB key. Pressing the TAB key changes the keyboard focus to the next control with the
        /// WS_TABSTOP style. You can turn this style on and off to change dialog box navigation. To
        /// change this style after a window has been created, use the SetWindowLong function. For
        /// user-created windows and modeless dialogs to work with tab stops, alter the message loop
        /// to call the IsDialogMessage function.
        /// 
        WS_TABSTOP = 0x10000,

        /// 

        /// The window is initially visible. This style can be turned on and off by using the
        /// ShowWindow or SetWindowPos function.
        /// 
        WS_VISIBLE = 0x10000000,

        /// 

        /// The window has a vertical scroll bar.
        /// 
        WS_VSCROLL = 0x200000
    }

    // http://www.pinvoke.net/default.aspx/Enums/WindowStylesEx.html
    [Flags]
    public enum WindowStylesEx : uint
    {
        /// 

        /// Specifies that a window created with this style accepts drag-drop files.
        /// 
        WS_EX_ACCEPTFILES = 0x00000010,

        /// 

        /// Forces a top-level window onto the taskbar when the window is visible.
        /// 
        WS_EX_APPWINDOW = 0x00040000,

        /// 

        /// Specifies that a window has a border with a sunken edge.
        /// 
        WS_EX_CLIENTEDGE = 0x00000200,

        /// 

        /// Windows XP: Paints all descendants of a window in bottom-to-top painting order using
        /// double-buffering. For more information, see Remarks. This cannot be used if the window
        /// has a class style of either CS_OWNDC or CS_CLASSDC.
        /// 
        WS_EX_COMPOSITED = 0x02000000,

        /// 

        /// Includes a question mark in the title bar of the window. When the user clicks the
        /// question mark, the cursor changes to a question mark with a pointer. If the user then
        /// clicks a child window, the child receives a WM_HELP message. The child window should
        /// pass the message to the parent window procedure, which should call the WinHelp function
        /// using the HELP_WM_HELP command. The Help application displays a pop-up window that
        /// typically contains help for the child window. WS_EX_CONTEXTHELP cannot be used with the
        /// WS_MAXIMIZEBOX or WS_MINIMIZEBOX styles.
        /// 
        WS_EX_CONTEXTHELP = 0x00000400,

        /// 

        /// The window itself contains child windows that should take part in dialog box navigation.
        /// If this style is specified, the dialog manager recurses into children of this window
        /// when performing navigation operations such as handling the TAB key, an arrow key, or a
        /// keyboard mnemonic.
        /// 
        WS_EX_CONTROLPARENT = 0x00010000,

        /// 

        /// Creates a window that has a double border; the window can, optionally, be created with a
        /// title bar by specifying the WS_CAPTION style in the dwStyle parameter.
        /// 
        WS_EX_DLGMODALFRAME = 0x00000001,

        /// 

        /// Windows 2000/XP: Creates a layered window. Note that this cannot be used for child
        /// windows. Also, this cannot be used if the window has a class style of either CS_OWNDC or CS_CLASSDC.
        /// 
        WS_EX_LAYERED = 0x00080000,

        /// 

        /// Arabic and Hebrew versions of Windows 98/Me, Windows 2000/XP: Creates a window whose
        /// horizontal origin is on the right edge. Increasing horizontal values advance to the left.
        /// 
        WS_EX_LAYOUTRTL = 0x00400000,

        /// 

        /// Creates a window that has generic left-aligned properties. This is the default.
        /// 
        WS_EX_LEFT = 0x00000000,

        /// 

        /// If the shell language is Hebrew, Arabic, or another language that supports reading order
        /// alignment, the vertical scroll bar (if present) is to the left of the client area. For
        /// other languages, the style is ignored.
        /// 
        WS_EX_LEFTSCROLLBAR = 0x00004000,

        /// 

        /// The window text is displayed using left-to-right reading-order properties. This is the default.
        /// 
        WS_EX_LTRREADING = 0x00000000,

        /// 

        /// Creates a multiple-document interface (MDI) child window.
        /// 
        WS_EX_MDICHILD = 0x00000040,

        /// 

        /// Windows 2000/XP: A top-level window created with this style does not become the
        /// foreground window when the user clicks it. The system does not bring this window to the
        /// foreground when the user minimizes or closes the foreground window. To activate the
        /// window, use the SetActiveWindow or SetForegroundWindow function. The window does not
        /// appear on the taskbar by default. To force the window to appear on the taskbar, use the
        /// WS_EX_APPWINDOW style.
        /// 
        WS_EX_NOACTIVATE = 0x08000000,

        /// 

        /// Windows 2000/XP: A window created with this style does not pass its window layout to its
        /// child windows.
        /// 
        WS_EX_NOINHERITLAYOUT = 0x00100000,

        /// 

        /// Specifies that a child window created with this style does not send the WM_PARENTNOTIFY
        /// message to its parent window when it is created or destroyed.
        /// 
        WS_EX_NOPARENTNOTIFY = 0x00000004,

        /// 

        /// Combines the WS_EX_CLIENTEDGE and WS_EX_WINDOWEDGE styles.
        /// 
        WS_EX_OVERLAPPEDWINDOW = WS_EX_WINDOWEDGE | WS_EX_CLIENTEDGE,

        /// 

        /// Combines the WS_EX_WINDOWEDGE, WS_EX_TOOLWINDOW, and WS_EX_TOPMOST styles.
        /// 
        WS_EX_PALETTEWINDOW = WS_EX_WINDOWEDGE | WS_EX_TOOLWINDOW | WS_EX_TOPMOST,

        /// 

        /// The window has generic "right-aligned" properties. This depends on the window class.
        /// This style has an effect only if the shell language is Hebrew, Arabic, or another
        /// language that supports reading-order alignment; otherwise, the style is ignored. Using
        /// the WS_EX_RIGHT style for static or edit controls has the same effect as using the
        /// SS_RIGHT or ES_RIGHT style, respectively. Using this style with button controls has the
        /// same effect as using BS_RIGHT and BS_RIGHTBUTTON styles.
        /// 
        WS_EX_RIGHT = 0x00001000,

        /// 

        /// Vertical scroll bar (if present) is to the right of the client area. This is the default.
        /// 
        WS_EX_RIGHTSCROLLBAR = 0x00000000,

        /// 

        /// If the shell language is Hebrew, Arabic, or another language that supports reading-order
        /// alignment, the window text is displayed using right-to-left reading-order properties.
        /// For other languages, the style is ignored.
        /// 
        WS_EX_RTLREADING = 0x00002000,

        /// 

        /// Creates a window with a three-dimensional border style intended to be used for items
        /// that do not accept user input.
        /// 
        WS_EX_STATICEDGE = 0x00020000,

        /// 

        /// Creates a tool window; that is, a window intended to be used as a floating toolbar. A
        /// tool window has a title bar that is shorter than a normal title bar, and the window
        /// title is drawn using a smaller font. A tool window does not appear in the taskbar or in
        /// the dialog that appears when the user presses ALT+TAB. If a tool window has a system
        /// menu, its icon is not displayed on the title bar. However, you can display the system
        /// menu by right-clicking or by typing ALT+SPACE.
        /// 
        WS_EX_TOOLWINDOW = 0x00000080,

        /// 

        /// Specifies that a window created with this style should be placed above all non-topmost
        /// windows and should stay above them, even when the window is deactivated. To add or
        /// remove this style, use the SetWindowPos function.
        /// 
        WS_EX_TOPMOST = 0x00000008,

        /// 

        /// Specifies that a window created with this style should not be painted until siblings
        /// beneath the window (that were created by the same thread) have been painted. The window
        /// appears transparent because the bits of underlying sibling windows have already been
        /// painted. To achieve transparency without these restrictions, use the SetWindowRgn function.
        /// 
        WS_EX_TRANSPARENT = 0x00000020,

        /// 

        /// Specifies that a window has a border with a raised edge.
        /// 
        WS_EX_WINDOWEDGE = 0x00000100
    }

    // http://www.pinvoke.net/default.aspx/Enums/WindowsMessages.html
    /// 

    /// Windows Messages Defined in winuser.h from Windows SDK v6.1 Documentation pulled from MSDN.
    /// 
    public enum WM : uint
    {
        /// 

        /// The WM_NULL message performs no operation. An application sends the WM_NULL message if
        /// it wants to post a message that the recipient window will ignore.
        /// 
        NULL = 0x0000,

        /// 

        /// The WM_CREATE message is sent when an application requests that a window be created by
        /// calling the CreateWindowEx or CreateWindow function. (The message is sent before the
        /// function returns.) The window procedure of the new window receives this message after
        /// the window is created, but before the window becomes visible.
        /// 
        CREATE = 0x0001,

        /// 

        /// The WM_DESTROY message is sent when a window is being destroyed. It is sent to the
        /// window procedure of the window being destroyed after the window is removed from the
        /// screen. This message is sent first to the window being destroyed and then to the child
        /// windows (if any) as they are destroyed. During the processing of the message, it can be
        /// assumed that all child windows still exist. ///
        /// 
        DESTROY = 0x0002,

        /// 

        /// The WM_MOVE message is sent after a window has been moved.
        /// 
        MOVE = 0x0003,

        /// 

        /// The WM_SIZE message is sent to a window after its size has changed.
        /// 
        SIZE = 0x0005,

        /// 

        /// The WM_ACTIVATE message is sent to both the window being activated and the window being
        /// deactivated. If the windows use the same input queue, the message is sent synchronously,
        /// first to the window procedure of the top-level window being deactivated, then to the
        /// window procedure of the top-level window being activated. If the windows use different
        /// input queues, the message is sent asynchronously, so the window is activated immediately.
        /// 
        ACTIVATE = 0x0006,

        /// 

        /// The WM_SETFOCUS message is sent to a window after it has gained the keyboard focus.
        /// 
        SETFOCUS = 0x0007,

        /// 

        /// The WM_KILLFOCUS message is sent to a window immediately before it loses the keyboard focus.
        /// 
        KILLFOCUS = 0x0008,

        /// 

        /// The WM_ENABLE message is sent when an application changes the enabled state of a window.
        /// It is sent to the window whose enabled state is changing. This message is sent before
        /// the EnableWindow function returns, but after the enabled state (WS_DISABLED style bit)
        /// of the window has changed.
        /// 
        ENABLE = 0x000A,

        /// 

        /// An application sends the WM_SETREDRAW message to a window to allow changes in that
        /// window to be redrawn or to prevent changes in that window from being redrawn.
        /// 
        SETREDRAW = 0x000B,

        /// 

        /// An application sends a WM_SETTEXT message to set the text of a window.
        /// 
        SETTEXT = 0x000C,

        /// 

        /// An application sends a WM_GETTEXT message to copy the text that corresponds to a window
        /// into a buffer provided by the caller.
        /// 
        GETTEXT = 0x000D,

        /// 

        /// An application sends a WM_GETTEXTLENGTH message to determine the length, in characters,
        /// of the text associated with a window.
        /// 
        GETTEXTLENGTH = 0x000E,

        /// 

        /// The WM_PAINT message is sent when the system or another application makes a request to
        /// paint a portion of an application's window. The message is sent when the UpdateWindow or
        /// RedrawWindow function is called, or by the DispatchMessage function when the application
        /// obtains a WM_PAINT message by using the GetMessage or PeekMessage function.
        /// 
        PAINT = 0x000F,

        /// 

        /// The WM_CLOSE message is sent as a signal that a window or an application should terminate.
        /// 
        CLOSE = 0x0010,

        /// 

        /// The WM_QUERYENDSESSION message is sent when the user chooses to end the session or when
        /// an application calls one of the system shutdown functions. If any application returns
        /// zero, the session is not ended. The system stops sending WM_QUERYENDSESSION messages as
        /// soon as one application returns zero. After processing this message, the system sends
        /// the WM_ENDSESSION message with the wParam parameter set to the results of the
        /// WM_QUERYENDSESSION message.
        /// 
        QUERYENDSESSION = 0x0011,

        /// 

        /// The WM_QUERYOPEN message is sent to an icon when the user requests that the window be
        /// restored to its previous size and position.
        /// 
        QUERYOPEN = 0x0013,

        /// 

        /// The WM_ENDSESSION message is sent to an application after the system processes the
        /// results of the WM_QUERYENDSESSION message. The WM_ENDSESSION message informs the
        /// application whether the session is ending.
        /// 
        ENDSESSION = 0x0016,

        /// 

        /// The WM_QUIT message indicates a request to terminate an application and is generated
        /// when the application calls the PostQuitMessage function. It causes the GetMessage
        /// function to return zero.
        /// 
        QUIT = 0x0012,

        /// 

        /// The WM_ERASEBKGND message is sent when the window background must be erased (for
        /// example, when a window is resized). The message is sent to prepare an invalidated
        /// portion of a window for painting.
        /// 
        ERASEBKGND = 0x0014,

        /// 

        /// This message is sent to all top-level windows when a change is made to a system color setting.
        /// 
        SYSCOLORCHANGE = 0x0015,

        /// 

        /// The WM_SHOWWINDOW message is sent to a window when the window is about to be hidden or shown.
        /// 
        SHOWWINDOW = 0x0018,

        /// 

        /// An application sends the WM_WININICHANGE message to all top-level windows after making a
        /// change to the WIN.INI file. The SystemParametersInfo function sends this message after
        /// an application uses the function to change a setting in WIN.INI. Note The
        /// WM_WININICHANGE message is provided only for compatibility with earlier versions of the
        /// system. Applications should use the WM_SETTINGCHANGE message.
        /// 
        WININICHANGE = 0x001A,

        /// 

        /// An application sends the WM_WININICHANGE message to all top-level windows after making a
        /// change to the WIN.INI file. The SystemParametersInfo function sends this message after
        /// an application uses the function to change a setting in WIN.INI. Note The
        /// WM_WININICHANGE message is provided only for compatibility with earlier versions of the
        /// system. Applications should use the WM_SETTINGCHANGE message.
        /// 
        SETTINGCHANGE = WININICHANGE,

        /// 

        /// The WM_DEVMODECHANGE message is sent to all top-level windows whenever the user changes
        /// device-mode settings.
        /// 
        DEVMODECHANGE = 0x001B,

        /// 

        /// The WM_ACTIVATEAPP message is sent when a window belonging to a different application
        /// than the active window is about to be activated. The message is sent to the application
        /// whose window is being activated and to the application whose window is being deactivated.
        /// 
        ACTIVATEAPP = 0x001C,

        /// 

        /// An application sends the WM_FONTCHANGE message to all top-level windows in the system
        /// after changing the pool of font resources.
        /// 
        FONTCHANGE = 0x001D,

        /// 

        /// A message that is sent whenever there is a change in the system time.
        /// 
        TIMECHANGE = 0x001E,

        /// 

        /// The WM_CANCELMODE message is sent to cancel certain modes, such as mouse capture. For
        /// example, the system sends this message to the active window when a dialog box or message
        /// box is displayed. Certain functions also send this message explicitly to the specified
        /// window regardless of whether it is the active window. For example, the EnableWindow
        /// function sends this message when disabling the specified window.
        /// 
        CANCELMODE = 0x001F,

        /// 

        /// The WM_SETCURSOR message is sent to a window if the mouse causes the cursor to move
        /// within a window and mouse input is not captured.
        /// 
        SETCURSOR = 0x0020,

        /// 

        /// The WM_MOUSEACTIVATE message is sent when the cursor is in an inactive window and the
        /// user presses a mouse button. The parent window receives this message only if the child
        /// window passes it to the DefWindowProc function.
        /// 
        MOUSEACTIVATE = 0x0021,

        /// 

        /// The WM_CHILDACTIVATE message is sent to a child window when the user clicks the window's
        /// title bar or when the window is activated, moved, or sized.
        /// 
        CHILDACTIVATE = 0x0022,

        /// 

        /// The WM_QUEUESYNC message is sent by a computer-based training (CBT) application to
        /// separate user-input messages from other messages sent through the WH_JOURNALPLAYBACK
        /// Hook procedure.
        /// 
        QUEUESYNC = 0x0023,

        /// 

        /// The WM_GETMINMAXINFO message is sent to a window when the size or position of the window
        /// is about to change. An application can use this message to override the window's default
        /// maximized size and position, or its default minimum or maximum tracking size.
        /// 
        GETMINMAXINFO = 0x0024,

        /// 

        /// Windows NT 3.51 and earlier: The WM_PAINTICON message is sent to a minimized window when
        /// the icon is to be painted. This message is not sent by newer versions of Microsoft
        /// Windows, except in unusual circumstances explained in the Remarks.
        /// 
        PAINTICON = 0x0026,

        /// 

        /// Windows NT 3.51 and earlier: The WM_ICONERASEBKGND message is sent to a minimized window
        /// when the background of the icon must be filled before painting the icon. A window
        /// receives this message only if a class icon is defined for the window; otherwise,
        /// WM_ERASEBKGND is sent. This message is not sent by newer versions of Windows.
        /// 
        ICONERASEBKGND = 0x0027,

        /// 

        /// The WM_NEXTDLGCTL message is sent to a dialog box procedure to set the keyboard focus to
        /// a different control in the dialog box.
        /// 
        NEXTDLGCTL = 0x0028,

        /// 

        /// The WM_SPOOLERSTATUS message is sent from Print Manager whenever a job is added to or
        /// removed from the Print Manager queue.
        /// 
        SPOOLERSTATUS = 0x002A,

        /// 

        /// The WM_DRAWITEM message is sent to the parent window of an owner-drawn button, combo
        /// box, list box, or menu when a visual aspect of the button, combo box, list box, or menu
        /// has changed.
        /// 
        DRAWITEM = 0x002B,

        /// 

        /// The WM_MEASUREITEM message is sent to the owner window of a combo box, list box, list
        /// view control, or menu item when the control or menu is created.
        /// 
        MEASUREITEM = 0x002C,

        /// 

        /// Sent to the owner of a list box or combo box when the list box or combo box is destroyed
        /// or when items are removed by the LB_DELETESTRING, LB_RESETCONTENT, CB_DELETESTRING, or
        /// CB_RESETCONTENT message. The system sends a WM_DELETEITEM message for each deleted item.
        /// The system sends the WM_DELETEITEM message for any deleted list box or combo box item
        /// with nonzero item data.
        /// 
        DELETEITEM = 0x002D,

        /// 

        /// Sent by a list box with the LBS_WANTKEYBOARDINPUT style to its owner in response to a
        /// WM_KEYDOWN message.
        /// 
        VKEYTOITEM = 0x002E,

        /// 

        /// Sent by a list box with the LBS_WANTKEYBOARDINPUT style to its owner in response to a
        /// WM_CHAR message.
        /// 
        CHARTOITEM = 0x002F,

        /// 

        /// An application sends a WM_SETFONT message to specify the font that a control is to use
        /// when drawing text.
        /// 
        SETFONT = 0x0030,

        /// 

        /// An application sends a WM_GETFONT message to a control to retrieve the font with which
        /// the control is currently drawing its text.
        /// 
        GETFONT = 0x0031,

        /// 

        /// An application sends a WM_SETHOTKEY message to a window to associate a hot key with the
        /// window. When the user presses the hot key, the system activates the window.
        /// 
        SETHOTKEY = 0x0032,

        /// 

        /// An application sends a WM_GETHOTKEY message to determine the hot key associated with a window.
        /// 
        GETHOTKEY = 0x0033,

        /// 

        /// The WM_QUERYDRAGICON message is sent to a minimized (iconic) window. The window is about
        /// to be dragged by the user but does not have an icon defined for its class. An
        /// application can return a handle to an icon or cursor. The system displays this cursor or
        /// icon while the user drags the icon.
        /// 
        QUERYDRAGICON = 0x0037,

        /// 

        /// The system sends the WM_COMPAREITEM message to determine the relative position of a new
        /// item in the sorted list of an owner-drawn combo box or list box. Whenever the
        /// application adds a new item, the system sends this message to the owner of a combo box
        /// or list box created with the CBS_SORT or LBS_SORT style.
        /// 
        COMPAREITEM = 0x0039,

        /// 

        /// Active Accessibility sends the WM_GETOBJECT message to obtain information about an
        /// accessible object contained in a server application. Applications never send this
        /// message directly. It is sent only by Active Accessibility in response to calls to
        /// AccessibleObjectFromPoint, AccessibleObjectFromEvent, or AccessibleObjectFromWindow.
        /// However, server applications handle this message.
        /// 
        GETOBJECT = 0x003D,

        /// 

        /// The WM_COMPACTING message is sent to all top-level windows when the system detects more
        /// than 12.5 percent of system time over a 30- to 60-second interval is being spent
        /// compacting memory. This indicates that system memory is low.
        /// 
        COMPACTING = 0x0041,

        /// 

        /// WM_COMMNOTIFY is Obsolete for Win32-Based Applications
        /// 
        [Obsolete]
        COMMNOTIFY = 0x0044,

        /// 

        /// The WM_WINDOWPOSCHANGING message is sent to a window whose size, position, or place in
        /// the Z order is about to change as a result of a call to the SetWindowPos function or
        /// another window-management function.
        /// 
        WINDOWPOSCHANGING = 0x0046,

        /// 

        /// The WM_WINDOWPOSCHANGED message is sent to a window whose size, position, or place in
        /// the Z order has changed as a result of a call to the SetWindowPos function or another
        /// window-management function.
        /// 
        WINDOWPOSCHANGED = 0x0047,

        /// 

        /// Notifies applications that the system, typically a battery-powered personal computer, is
        /// about to enter a suspended mode.
        /// Use: POWERBROADCAST
        /// 
        [Obsolete]
        POWER = 0x0048,

        /// 

        /// An application sends the WM_COPYDATA message to pass data to another application.
        /// 
        COPYDATA = 0x004A,

        /// 

        /// The WM_CANCELJOURNAL message is posted to an application when a user cancels the
        /// application's journaling activities. The message is posted with a NULL window handle.
        /// 
        CANCELJOURNAL = 0x004B,

        /// 

        /// Sent by a common control to its parent window when an event has occurred or the control
        /// requires some information.
        /// 
        NOTIFY = 0x004E,

        /// 

        /// The WM_INPUTLANGCHANGEREQUEST message is posted to the window with the focus when the
        /// user chooses a new input language, either with the hotkey (specified in the Keyboard
        /// control panel application) or from the indicator on the system taskbar. An application
        /// can accept the change by passing the message to the DefWindowProc function or reject the
        /// change (and prevent it from taking place) by returning immediately.
        /// 
        INPUTLANGCHANGEREQUEST = 0x0050,

        /// 

        /// The WM_INPUTLANGCHANGE message is sent to the topmost affected window after an
        /// application's input language has been changed. You should make any application-specific
        /// settings and pass the message to the DefWindowProc function, which passes the message to
        /// all first-level child windows. These child windows can pass the message to DefWindowProc
        /// to have it pass the message to their child windows, and so on.
        /// 
        INPUTLANGCHANGE = 0x0051,

        /// 

        /// Sent to an application that has initiated a training card with Microsoft Windows Help.
        /// The message informs the application when the user clicks an authorable button. An
        /// application initiates a training card by specifying the HELP_TCARD command in a call to
        /// the WinHelp function.
        /// 
        TCARD = 0x0052,

        /// 

        /// Indicates that the user pressed the F1 key. If a menu is active when F1 is pressed,
        /// WM_HELP is sent to the window associated with the menu; otherwise, WM_HELP is sent to
        /// the window that has the keyboard focus. If no window has the keyboard focus, WM_HELP is
        /// sent to the currently active window.
        /// 
        HELP = 0x0053,

        /// 

        /// The WM_USERCHANGED message is sent to all windows after the user has logged on or off.
        /// When the user logs on or off, the system updates the user-specific settings. The system
        /// sends this message immediately after updating the settings.
        /// 
        USERCHANGED = 0x0054,

        /// 

        /// Determines if a window accepts ANSI or Unicode structures in the WM_NOTIFY notification
        /// message. WM_NOTIFYFORMAT messages are sent from a common control to its parent window
        /// and from the parent window to the common control.
        /// 
        NOTIFYFORMAT = 0x0055,

        /// 

        /// The WM_CONTEXTMENU message notifies a window that the user clicked the right mouse
        /// button (right-clicked) in the window.
        /// 
        CONTEXTMENU = 0x007B,

        /// 

        /// The WM_STYLECHANGING message is sent to a window when the SetWindowLong function is
        /// about to change one or more of the window's styles.
        /// 
        STYLECHANGING = 0x007C,

        /// 

        /// The WM_STYLECHANGED message is sent to a window after the SetWindowLong function has
        /// changed one or more of the window's styles
        /// 
        STYLECHANGED = 0x007D,

        /// 

        /// The WM_DISPLAYCHANGE message is sent to all windows when the display resolution has changed.
        /// 
        DISPLAYCHANGE = 0x007E,

        /// 

        /// The WM_GETICON message is sent to a window to retrieve a handle to the large or small
        /// icon associated with a window. The system displays the large icon in the ALT+TAB dialog,
        /// and the small icon in the window caption.
        /// 
        GETICON = 0x007F,

        /// 

        /// An application sends the WM_SETICON message to associate a new large or small icon with
        /// a window. The system displays the large icon in the ALT+TAB dialog box, and the small
        /// icon in the window caption.
        /// 
        SETICON = 0x0080,

        /// 

        /// The WM_NCCREATE message is sent prior to the WM_CREATE message when a window is first created.
        /// 
        NCCREATE = 0x0081,

        /// 

        /// The WM_NCDESTROY message informs a window that its nonclient area is being destroyed.
        /// The DestroyWindow function sends the WM_NCDESTROY message to the window following the
        /// WM_DESTROY message. WM_DESTROY is used to free the allocated memory object associated
        /// with the window. The WM_NCDESTROY message is sent after the child windows have been
        /// destroyed. In contrast, WM_DESTROY is sent before the child windows are destroyed.
        /// 
        NCDESTROY = 0x0082,

        /// 

        /// The WM_NCCALCSIZE message is sent when the size and position of a window's client area
        /// must be calculated. By processing this message, an application can control the content
        /// of the window's client area when the size or position of the window changes.
        /// 
        NCCALCSIZE = 0x0083,

        /// 

        /// The WM_NCHITTEST message is sent to a window when the cursor moves, or when a mouse
        /// button is pressed or released. If the mouse is not captured, the message is sent to the
        /// window beneath the cursor. Otherwise, the message is sent to the window that has
        /// captured the mouse.
        /// 
        NCHITTEST = 0x0084,

        /// 

        /// The WM_NCPAINT message is sent to a window when its frame must be painted.
        /// 
        NCPAINT = 0x0085,

        /// 

        /// The WM_NCACTIVATE message is sent to a window when its nonclient area needs to be
        /// changed to indicate an active or inactive state.
        /// 
        NCACTIVATE = 0x0086,

        /// 

        /// The WM_GETDLGCODE message is sent to the window procedure associated with a control. By
        /// default, the system handles all keyboard input to the control; the system interprets
        /// certain types of keyboard input as dialog box navigation keys. To override this default
        /// behavior, the control can respond to the WM_GETDLGCODE message to indicate the types of
        /// input it wants to process itself.
        /// 
        GETDLGCODE = 0x0087,

        /// 

        /// The WM_SYNCPAINT message is used to synchronize painting while avoiding linking
        /// independent GUI threads.
        /// 
        SYNCPAINT = 0x0088,

        /// 

        /// The WM_NCMOUSEMOVE message is posted to a window when the cursor is moved within the
        /// nonclient area of the window. This message is posted to the window that contains the
        /// cursor. If a window has captured the mouse, this message is not posted.
        /// 
        NCMOUSEMOVE = 0x00A0,

        /// 

        /// The WM_NCLBUTTONDOWN message is posted when the user presses the left mouse button while
        /// the cursor is within the nonclient area of a window. This message is posted to the
        /// window that contains the cursor. If a window has captured the mouse, this message is not posted.
        /// 
        NCLBUTTONDOWN = 0x00A1,

        /// 

        /// The WM_NCLBUTTONUP message is posted when the user releases the left mouse button while
        /// the cursor is within the nonclient area of a window. This message is posted to the
        /// window that contains the cursor. If a window has captured the mouse, this message is not posted.
        /// 
        NCLBUTTONUP = 0x00A2,

        /// 

        /// The WM_NCLBUTTONDBLCLK message is posted when the user double-clicks the left mouse
        /// button while the cursor is within the nonclient area of a window. This message is posted
        /// to the window that contains the cursor. If a window has captured the mouse, this message
        /// is not posted.
        /// 
        NCLBUTTONDBLCLK = 0x00A3,

        /// 

        /// The WM_NCRBUTTONDOWN message is posted when the user presses the right mouse button
        /// while the cursor is within the nonclient area of a window. This message is posted to the
        /// window that contains the cursor. If a window has captured the mouse, this message is not posted.
        /// 
        NCRBUTTONDOWN = 0x00A4,

        /// 

        /// The WM_NCRBUTTONUP message is posted when the user releases the right mouse button while
        /// the cursor is within the nonclient area of a window. This message is posted to the
        /// window that contains the cursor. If a window has captured the mouse, this message is not posted.
        /// 
        NCRBUTTONUP = 0x00A5,

        /// 

        /// The WM_NCRBUTTONDBLCLK message is posted when the user double-clicks the right mouse
        /// button while the cursor is within the nonclient area of a window. This message is posted
        /// to the window that contains the cursor. If a window has captured the mouse, this message
        /// is not posted.
        /// 
        NCRBUTTONDBLCLK = 0x00A6,

        /// 

        /// The WM_NCMBUTTONDOWN message is posted when the user presses the middle mouse button
        /// while the cursor is within the nonclient area of a window. This message is posted to the
        /// window that contains the cursor. If a window has captured the mouse, this message is not posted.
        /// 
        NCMBUTTONDOWN = 0x00A7,

        /// 

        /// The WM_NCMBUTTONUP message is posted when the user releases the middle mouse button
        /// while the cursor is within the nonclient area of a window. This message is posted to the
        /// window that contains the cursor. If a window has captured the mouse, this message is not posted.
        /// 
        NCMBUTTONUP = 0x00A8,

        /// 

        /// The WM_NCMBUTTONDBLCLK message is posted when the user double-clicks the middle mouse
        /// button while the cursor is within the nonclient area of a window. This message is posted
        /// to the window that contains the cursor. If a window has captured the mouse, this message
        /// is not posted.
        /// 
        NCMBUTTONDBLCLK = 0x00A9,

        /// 

        /// The WM_NCXBUTTONDOWN message is posted when the user presses the first or second X
        /// button while the cursor is in the nonclient area of a window. This message is posted to
        /// the window that contains the cursor. If a window has captured the mouse, this message is
        /// not posted.
        /// 
        NCXBUTTONDOWN = 0x00AB,

        /// 

        /// The WM_NCXBUTTONUP message is posted when the user releases the first or second X button
        /// while the cursor is in the nonclient area of a window. This message is posted to the
        /// window that contains the cursor. If a window has captured the mouse, this message is not posted.
        /// 
        NCXBUTTONUP = 0x00AC,

        /// 

        /// The WM_NCXBUTTONDBLCLK message is posted when the user double-clicks the first or second
        /// X button while the cursor is in the nonclient area of a window. This message is posted
        /// to the window that contains the cursor. If a window has captured the mouse, this message
        /// is not posted.
        /// 
        NCXBUTTONDBLCLK = 0x00AD,

        /// 

        /// The WM_INPUT_DEVICE_CHANGE message is sent to the window that registered to receive raw
        /// input. A window receives this message through its WindowProc function.
        /// 
        INPUT_DEVICE_CHANGE = 0x00FE,

        /// 

        /// The WM_INPUT message is sent to the window that is getting raw input.
        /// 
        INPUT = 0x00FF,

        /// 

        /// This message filters for keyboard messages.
        /// 
        KEYFIRST = 0x0100,

        /// 

        /// The WM_KEYDOWN message is posted to the window with the keyboard focus when a nonsystem
        /// key is pressed. A nonsystem key is a key that is pressed when the ALT key is not pressed.
        /// 
        KEYDOWN = 0x0100,

        /// 

        /// The WM_KEYUP message is posted to the window with the keyboard focus when a nonsystem
        /// key is released. A nonsystem key is a key that is pressed when the ALT key is not
        /// pressed, or a keyboard key that is pressed when a window has the keyboard focus.
        /// 
        KEYUP = 0x0101,

        /// 

        /// The WM_CHAR message is posted to the window with the keyboard focus when a WM_KEYDOWN
        /// message is translated by the TranslateMessage function. The WM_CHAR message contains the
        /// character code of the key that was pressed.
        /// 
        CHAR = 0x0102,

        /// 

        /// The WM_DEADCHAR message is posted to the window with the keyboard focus when a WM_KEYUP
        /// message is translated by the TranslateMessage function. WM_DEADCHAR specifies a
        /// character code generated by a dead key. A dead key is a key that generates a character,
        /// such as the umlaut (double-dot), that is combined with another character to form a
        /// composite character. For example, the umlaut-O character (Ö) is generated by typing the
        /// dead key for the umlaut character, and then typing the O key.
        /// 
        DEADCHAR = 0x0103,

        /// 

        /// The WM_SYSKEYDOWN message is posted to the window with the keyboard focus when the user
        /// presses the F10 key (which activates the menu bar) or holds down the ALT key and then
        /// presses another key. It also occurs when no window currently has the keyboard focus; in
        /// this case, the WM_SYSKEYDOWN message is sent to the active window. The window that
        /// receives the message can distinguish between these two contexts by checking the context
        /// code in the lParam parameter.
        /// 
        SYSKEYDOWN = 0x0104,

        /// 

        /// The WM_SYSKEYUP message is posted to the window with the keyboard focus when the user
        /// releases a key that was pressed while the ALT key was held down. It also occurs when no
        /// window currently has the keyboard focus; in this case, the WM_SYSKEYUP message is sent
        /// to the active window. The window that receives the message can distinguish between these
        /// two contexts by checking the context code in the lParam parameter.
        /// 
        SYSKEYUP = 0x0105,

        /// 

        /// The WM_SYSCHAR message is posted to the window with the keyboard focus when a
        /// WM_SYSKEYDOWN message is translated by the TranslateMessage function. It specifies the
        /// character code of a system character key — that is, a character key that is pressed
        /// while the ALT key is down.
        /// 
        SYSCHAR = 0x0106,

        /// 

        /// The WM_SYSDEADCHAR message is sent to the window with the keyboard focus when a
        /// WM_SYSKEYDOWN message is translated by the TranslateMessage function. WM_SYSDEADCHAR
        /// specifies the character code of a system dead key — that is, a dead key that is pressed
        /// while holding down the ALT key.
        /// 
        SYSDEADCHAR = 0x0107,

        /// 

        /// The WM_UNICHAR message is posted to the window with the keyboard focus when a WM_KEYDOWN
        /// message is translated by the TranslateMessage function. The WM_UNICHAR message contains
        /// the character code of the key that was pressed. The WM_UNICHAR message is equivalent to
        /// WM_CHAR, but it uses Unicode Transformation Format (UTF)-32, whereas WM_CHAR uses
        /// UTF-16. It is designed to send or post Unicode characters to ANSI windows and it can can
        /// handle Unicode Supplementary Plane characters.
        /// 
        UNICHAR = 0x0109,

        /// 

        /// This message filters for keyboard messages.
        /// 
        KEYLAST = 0x0109,

        /// 

        /// Sent immediately before the IME generates the composition string as a result of a
        /// keystroke. A window receives this message through its WindowProc function.
        /// 
        IME_STARTCOMPOSITION = 0x010D,

        /// 

        /// Sent to an application when the IME ends composition. A window receives this message
        /// through its WindowProc function.
        /// 
        IME_ENDCOMPOSITION = 0x010E,

        /// 

        /// Sent to an application when the IME changes composition status as a result of a
        /// keystroke. A window receives this message through its WindowProc function.
        /// 
        IME_COMPOSITION = 0x010F,

        IME_KEYLAST = 0x010F,

        /// 

        /// The WM_INITDIALOG message is sent to the dialog box procedure immediately before a
        /// dialog box is displayed. Dialog box procedures typically use this message to initialize
        /// controls and carry out any other initialization tasks that affect the appearance of the
        /// dialog box.
        /// 
        INITDIALOG = 0x0110,

        /// 

        /// The WM_COMMAND message is sent when the user selects a command item from a menu, when a
        /// control sends a notification message to its parent window, or when an accelerator
        /// keystroke is translated.
        /// 
        COMMAND = 0x0111,

        /// 

        /// A window receives this message when the user chooses a command from the Window menu,
        /// clicks the maximize button, minimize button, restore button, close button, or moves the
        /// form. You can stop the form from moving by filtering this out.
        /// 
        SYSCOMMAND = 0x0112,

        /// 

        /// The WM_TIMER message is posted to the installing thread's message queue when a timer
        /// expires. The message is posted by the GetMessage or PeekMessage function.
        /// 
        TIMER = 0x0113,

        /// 

        /// The WM_HSCROLL message is sent to a window when a scroll event occurs in the window's
        /// standard horizontal scroll bar. This message is also sent to the owner of a horizontal
        /// scroll bar control when a scroll event occurs in the control.
        /// 
        HSCROLL = 0x0114,

        /// 

        /// The WM_VSCROLL message is sent to a window when a scroll event occurs in the window's
        /// standard vertical scroll bar. This message is also sent to the owner of a vertical
        /// scroll bar control when a scroll event occurs in the control.
        /// 
        VSCROLL = 0x0115,

        /// 

        /// The WM_INITMENU message is sent when a menu is about to become active. It occurs when
        /// the user clicks an item on the menu bar or presses a menu key. This allows the
        /// application to modify the menu before it is displayed.
        /// 
        INITMENU = 0x0116,

        /// 

        /// The WM_INITMENUPOPUP message is sent when a drop-down menu or submenu is about to become
        /// active. This allows an application to modify the menu before it is displayed, without
        /// changing the entire menu.
        /// 
        INITMENUPOPUP = 0x0117,

        /// 

        /// The WM_MENUSELECT message is sent to a menu's owner window when the user selects a menu item.
        /// 
        MENUSELECT = 0x011F,

        /// 

        /// The WM_MENUCHAR message is sent when a menu is active and the user presses a key that
        /// does not correspond to any mnemonic or accelerator key. This message is sent to the
        /// window that owns the menu.
        /// 
        MENUCHAR = 0x0120,

        /// 

        /// The WM_ENTERIDLE message is sent to the owner window of a modal dialog box or menu that
        /// is entering an idle state. A modal dialog box or menu enters an idle state when no
        /// messages are waiting in its queue after it has processed one or more previous messages.
        /// 
        ENTERIDLE = 0x0121,

        /// 

        /// The WM_MENURBUTTONUP message is sent when the user releases the right mouse button while
        /// the cursor is on a menu item.
        /// 
        MENURBUTTONUP = 0x0122,

        /// 

        /// The WM_MENUDRAG message is sent to the owner of a drag-and-drop menu when the user drags
        /// a menu item.
        /// 
        MENUDRAG = 0x0123,

        /// 

        /// The WM_MENUGETOBJECT message is sent to the owner of a drag-and-drop menu when the mouse
        /// cursor enters a menu item or moves from the center of the item to the top or bottom of
        /// the item.
        /// 
        MENUGETOBJECT = 0x0124,

        /// 

        /// The WM_UNINITMENUPOPUP message is sent when a drop-down menu or submenu has been destroyed.
        /// 
        UNINITMENUPOPUP = 0x0125,

        /// 

        /// The WM_MENUCOMMAND message is sent when the user makes a selection from a menu.
        /// 
        MENUCOMMAND = 0x0126,

        /// 

        /// An application sends the WM_CHANGEUISTATE message to indicate that the user interface
        /// (UI) state should be changed.
        /// 
        CHANGEUISTATE = 0x0127,

        /// 

        /// An application sends the WM_UPDATEUISTATE message to change the user interface (UI)
        /// state for the specified window and all its child windows.
        /// 
        UPDATEUISTATE = 0x0128,

        /// 

        /// An application sends the WM_QUERYUISTATE message to retrieve the user interface (UI)
        /// state for a window.
        /// 
        QUERYUISTATE = 0x0129,

        /// 

        /// The WM_CTLCOLORMSGBOX message is sent to the owner window of a message box before
        /// Windows draws the message box. By responding to this message, the owner window can set
        /// the text and background colors of the message box by using the given display device
        /// context handle.
        /// 
        CTLCOLORMSGBOX = 0x0132,

        /// 

        /// An edit control that is not read-only or disabled sends the WM_CTLCOLOREDIT message to
        /// its parent window when the control is about to be drawn. By responding to this message,
        /// the parent window can use the specified device context handle to set the text and
        /// background colors of the edit control.
        /// 
        CTLCOLOREDIT = 0x0133,

        /// 

        /// Sent to the parent window of a list box before the system draws the list box. By
        /// responding to this message, the parent window can set the text and background colors of
        /// the list box by using the specified display device context handle.
        /// 
        CTLCOLORLISTBOX = 0x0134,

        /// 

        /// The WM_CTLCOLORBTN message is sent to the parent window of a button before drawing the
        /// button. The parent window can change the button's text and background colors. However,
        /// only owner-drawn buttons respond to the parent window processing this message.
        /// 
        CTLCOLORBTN = 0x0135,

        /// 

        /// The WM_CTLCOLORDLG message is sent to a dialog box before the system draws the dialog
        /// box. By responding to this message, the dialog box can set its text and background
        /// colors using the specified display device context handle.
        /// 
        CTLCOLORDLG = 0x0136,

        /// 

        /// The WM_CTLCOLORSCROLLBAR message is sent to the parent window of a scroll bar control
        /// when the control is about to be drawn. By responding to this message, the parent window
        /// can use the display context handle to set the background color of the scroll bar control.
        /// 
        CTLCOLORSCROLLBAR = 0x0137,

        /// 

        /// A static control, or an edit control that is read-only or disabled, sends the
        /// WM_CTLCOLORSTATIC message to its parent window when the control is about to be drawn. By
        /// responding to this message, the parent window can use the specified device context
        /// handle to set the text and background colors of the static control.
        /// 
        CTLCOLORSTATIC = 0x0138,

        /// 

        /// Use WM_MOUSEFIRST to specify the first mouse message. Use the PeekMessage() Function.
        /// 
        MOUSEFIRST = 0x0200,

        /// 

        /// The WM_MOUSEMOVE message is posted to a window when the cursor moves. If the mouse is
        /// not captured, the message is posted to the window that contains the cursor. Otherwise,
        /// the message is posted to the window that has captured the mouse.
        /// 
        MOUSEMOVE = 0x0200,

        /// 

        /// The WM_LBUTTONDOWN message is posted when the user presses the left mouse button while
        /// the cursor is in the client area of a window. If the mouse is not captured, the message
        /// is posted to the window beneath the cursor. Otherwise, the message is posted to the
        /// window that has captured the mouse.
        /// 
        LBUTTONDOWN = 0x0201,

        /// 

        /// The WM_LBUTTONUP message is posted when the user releases the left mouse button while
        /// the cursor is in the client area of a window. If the mouse is not captured, the message
        /// is posted to the window beneath the cursor. Otherwise, the message is posted to the
        /// window that has captured the mouse.
        /// 
        LBUTTONUP = 0x0202,

        /// 

        /// The WM_LBUTTONDBLCLK message is posted when the user double-clicks the left mouse button
        /// while the cursor is in the client area of a window. If the mouse is not captured, the
        /// message is posted to the window beneath the cursor. Otherwise, the message is posted to
        /// the window that has captured the mouse.
        /// 
        LBUTTONDBLCLK = 0x0203,

        /// 

        /// The WM_RBUTTONDOWN message is posted when the user presses the right mouse button while
        /// the cursor is in the client area of a window. If the mouse is not captured, the message
        /// is posted to the window beneath the cursor. Otherwise, the message is posted to the
        /// window that has captured the mouse.
        /// 
        RBUTTONDOWN = 0x0204,

        /// 

        /// The WM_RBUTTONUP message is posted when the user releases the right mouse button while
        /// the cursor is in the client area of a window. If the mouse is not captured, the message
        /// is posted to the window beneath the cursor. Otherwise, the message is posted to the
        /// window that has captured the mouse.
        /// 
        RBUTTONUP = 0x0205,

        /// 

        /// The WM_RBUTTONDBLCLK message is posted when the user double-clicks the right mouse
        /// button while the cursor is in the client area of a window. If the mouse is not captured,
        /// the message is posted to the window beneath the cursor. Otherwise, the message is posted
        /// to the window that has captured the mouse.
        /// 
        RBUTTONDBLCLK = 0x0206,

        /// 

        /// The WM_MBUTTONDOWN message is posted when the user presses the middle mouse button while
        /// the cursor is in the client area of a window. If the mouse is not captured, the message
        /// is posted to the window beneath the cursor. Otherwise, the message is posted to the
        /// window that has captured the mouse.
        /// 
        MBUTTONDOWN = 0x0207,

        /// 

        /// The WM_MBUTTONUP message is posted when the user releases the middle mouse button while
        /// the cursor is in the client area of a window. If the mouse is not captured, the message
        /// is posted to the window beneath the cursor. Otherwise, the message is posted to the
        /// window that has captured the mouse.
        /// 
        MBUTTONUP = 0x0208,

        /// 

        /// The WM_MBUTTONDBLCLK message is posted when the user double-clicks the middle mouse
        /// button while the cursor is in the client area of a window. If the mouse is not captured,
        /// the message is posted to the window beneath the cursor. Otherwise, the message is posted
        /// to the window that has captured the mouse.
        /// 
        MBUTTONDBLCLK = 0x0209,

        /// 

        /// The WM_MOUSEWHEEL message is sent to the focus window when the mouse wheel is rotated.
        /// The DefWindowProc function propagates the message to the window's parent. There should
        /// be no internal forwarding of the message, since DefWindowProc propagates it up the
        /// parent chain until it finds a window that processes it.
        /// 
        MOUSEWHEEL = 0x020A,

        /// 

        /// The WM_XBUTTONDOWN message is posted when the user presses the first or second X button
        /// while the cursor is in the client area of a window. If the mouse is not captured, the
        /// message is posted to the window beneath the cursor. Otherwise, the message is posted to
        /// the window that has captured the mouse.
        /// 
        XBUTTONDOWN = 0x020B,

        /// 

        /// The WM_XBUTTONUP message is posted when the user releases the first or second X button
        /// while the cursor is in the client area of a window. If the mouse is not captured, the
        /// message is posted to the window beneath the cursor. Otherwise, the message is posted to
        /// the window that has captured the mouse.
        /// 
        XBUTTONUP = 0x020C,

        /// 

        /// The WM_XBUTTONDBLCLK message is posted when the user double-clicks the first or second X
        /// button while the cursor is in the client area of a window. If the mouse is not captured,
        /// the message is posted to the window beneath the cursor. Otherwise, the message is posted
        /// to the window that has captured the mouse.
        /// 
        XBUTTONDBLCLK = 0x020D,

        /// 

        /// The WM_MOUSEHWHEEL message is sent to the focus window when the mouse's horizontal
        /// scroll wheel is tilted or rotated. The DefWindowProc function propagates the message to
        /// the window's parent. There should be no internal forwarding of the message, since
        /// DefWindowProc propagates it up the parent chain until it finds a window that processes it.
        /// 
        MOUSEHWHEEL = 0x020E,

        /// 

        /// Use WM_MOUSELAST to specify the last mouse message. Used with PeekMessage() Function.
        /// 
        MOUSELAST = 0x020E,

        /// 

        /// The WM_PARENTNOTIFY message is sent to the parent of a child window when the child
        /// window is created or destroyed, or when the user clicks a mouse button while the cursor
        /// is over the child window. When the child window is being created, the system sends
        /// WM_PARENTNOTIFY just before the CreateWindow or CreateWindowEx function that creates the
        /// window returns. When the child window is being destroyed, the system sends the message
        /// before any processing to destroy the window takes place.
        /// 
        PARENTNOTIFY = 0x0210,

        /// 

        /// The WM_ENTERMENULOOP message informs an application's main window procedure that a menu
        /// modal loop has been entered.
        /// 
        ENTERMENULOOP = 0x0211,

        /// 

        /// The WM_EXITMENULOOP message informs an application's main window procedure that a menu
        /// modal loop has been exited.
        /// 
        EXITMENULOOP = 0x0212,

        /// 

        /// The WM_NEXTMENU message is sent to an application when the right or left arrow key is
        /// used to switch between the menu bar and the system menu.
        /// 
        NEXTMENU = 0x0213,

        /// 

        /// The WM_SIZING message is sent to a window that the user is resizing. By processing this
        /// message, an application can monitor the size and position of the drag rectangle and, if
        /// needed, change its size or position.
        /// 
        SIZING = 0x0214,

        /// 

        /// The WM_CAPTURECHANGED message is sent to the window that is losing the mouse capture.
        /// 
        CAPTURECHANGED = 0x0215,

        /// 

        /// The WM_MOVING message is sent to a window that the user is moving. By processing this
        /// message, an application can monitor the position of the drag rectangle and, if needed,
        /// change its position.
        /// 
        MOVING = 0x0216,

        /// 

        /// Notifies applications that a power-management event has occurred.
        /// 
        POWERBROADCAST = 0x0218,

        /// 

        /// Notifies an application of a change to the hardware configuration of a device or the computer.
        /// 
        DEVICECHANGE = 0x0219,

        /// 

        /// An application sends the WM_MDICREATE message to a multiple-document interface (MDI)
        /// client window to create an MDI child window.
        /// 
        MDICREATE = 0x0220,

        /// 

        /// An application sends the WM_MDIDESTROY message to a multiple-document interface (MDI)
        /// client window to close an MDI child window.
        /// 
        MDIDESTROY = 0x0221,

        /// 

        /// An application sends the WM_MDIACTIVATE message to a multiple-document interface (MDI)
        /// client window to instruct the client window to activate a different MDI child window.
        /// 
        MDIACTIVATE = 0x0222,

        /// 

        /// An application sends the WM_MDIRESTORE message to a multiple-document interface (MDI)
        /// client window to restore an MDI child window from maximized or minimized size.
        /// 
        MDIRESTORE = 0x0223,

        /// 

        /// An application sends the WM_MDINEXT message to a multiple-document interface (MDI)
        /// client window to activate the next or previous child window.
        /// 
        MDINEXT = 0x0224,

        /// 

        /// An application sends the WM_MDIMAXIMIZE message to a multiple-document interface (MDI)
        /// client window to maximize an MDI child window. The system resizes the child window to
        /// make its client area fill the client window. The system places the child window's window
        /// menu icon in the rightmost position of the frame window's menu bar, and places the child
        /// window's restore icon in the leftmost position. The system also appends the title bar
        /// text of the child window to that of the frame window.
        /// 
        MDIMAXIMIZE = 0x0225,

        /// 

        /// An application sends the WM_MDITILE message to a multiple-document interface (MDI)
        /// client window to arrange all of its MDI child windows in a tile format.
        /// 
        MDITILE = 0x0226,

        /// 

        /// An application sends the WM_MDICASCADE message to a multiple-document interface (MDI)
        /// client window to arrange all its child windows in a cascade format.
        /// 
        MDICASCADE = 0x0227,

        /// 

        /// An application sends the WM_MDIICONARRANGE message to a multiple-document interface
        /// (MDI) client window to arrange all minimized MDI child windows. It does not affect child
        /// windows that are not minimized.
        /// 
        MDIICONARRANGE = 0x0228,

        /// 

        /// An application sends the WM_MDIGETACTIVE message to a multiple-document interface (MDI)
        /// client window to retrieve the handle to the active MDI child window.
        /// 
        MDIGETACTIVE = 0x0229,

        /// 

        /// An application sends the WM_MDISETMENU message to a multiple-document interface (MDI)
        /// client window to replace the entire menu of an MDI frame window, to replace the window
        /// menu of the frame window, or both.
        /// 
        MDISETMENU = 0x0230,

        /// 

        /// The WM_ENTERSIZEMOVE message is sent one time to a window after it enters the moving or
        /// sizing modal loop. The window enters the moving or sizing modal loop when the user
        /// clicks the window's title bar or sizing border, or when the window passes the
        /// WM_SYSCOMMAND message to the DefWindowProc function and the wParam parameter of the
        /// message specifies the SC_MOVE or SC_SIZE value. The operation is complete when
        /// DefWindowProc returns. The system sends the WM_ENTERSIZEMOVE message regardless of
        /// whether the dragging of full windows is enabled.
        /// 
        ENTERSIZEMOVE = 0x0231,

        /// 

        /// The WM_EXITSIZEMOVE message is sent one time to a window, after it has exited the moving
        /// or sizing modal loop. The window enters the moving or sizing modal loop when the user
        /// clicks the window's title bar or sizing border, or when the window passes the
        /// WM_SYSCOMMAND message to the DefWindowProc function and the wParam parameter of the
        /// message specifies the SC_MOVE or SC_SIZE value. The operation is complete when
        /// DefWindowProc returns.
        /// 
        EXITSIZEMOVE = 0x0232,

        /// 

        /// Sent when the user drops a file on the window of an application that has registered
        /// itself as a recipient of dropped files.
        /// 
        DROPFILES = 0x0233,

        /// 

        /// An application sends the WM_MDIREFRESHMENU message to a multiple-document interface
        /// (MDI) client window to refresh the window menu of the MDI frame window.
        /// 
        MDIREFRESHMENU = 0x0234,

        /// 

        /// Sent to an application when a window is activated. A window receives this message
        /// through its WindowProc function.
        /// 
        IME_SETCONTEXT = 0x0281,

        /// 

        /// Sent to an application to notify it of changes to the IME window. A window receives this
        /// message through its WindowProc function.
        /// 
        IME_NOTIFY = 0x0282,

        /// 

        /// Sent by an application to direct the IME window to carry out the requested command. The
        /// application uses this message to control the IME window that it has created. To send
        /// this message, the application calls the SendMessage function with the following parameters.
        /// 
        IME_CONTROL = 0x0283,

        /// 

        /// Sent to an application when the IME window finds no space to extend the area for the
        /// composition window. A window receives this message through its WindowProc function.
        /// 
        IME_COMPOSITIONFULL = 0x0284,

        /// 

        /// Sent to an application when the operating system is about to change the current IME. A
        /// window receives this message through its WindowProc function.
        /// 
        IME_SELECT = 0x0285,

        /// 

        /// Sent to an application when the IME gets a character of the conversion result. A window
        /// receives this message through its WindowProc function.
        /// 
        IME_CHAR = 0x0286,

        /// 

        /// Sent to an application to provide commands and request information. A window receives
        /// this message through its WindowProc function.
        /// 
        IME_REQUEST = 0x0288,

        /// 

        /// Sent to an application by the IME to notify the application of a key press and to keep
        /// message order. A window receives this message through its WindowProc function.
        /// 
        IME_KEYDOWN = 0x0290,

        /// 

        /// Sent to an application by the IME to notify the application of a key release and to keep
        /// message order. A window receives this message through its WindowProc function.
        /// 
        IME_KEYUP = 0x0291,

        /// 

        /// The WM_MOUSEHOVER message is posted to a window when the cursor hovers over the client
        /// area of the window for the period of time specified in a prior call to TrackMouseEvent.
        /// 
        MOUSEHOVER = 0x02A1,

        /// 

        /// The WM_MOUSELEAVE message is posted to a window when the cursor leaves the client area
        /// of the window specified in a prior call to TrackMouseEvent.
        /// 
        MOUSELEAVE = 0x02A3,

        /// 

        /// The WM_NCMOUSEHOVER message is posted to a window when the cursor hovers over the
        /// nonclient area of the window for the period of time specified in a prior call to TrackMouseEvent.
        /// 
        NCMOUSEHOVER = 0x02A0,

        /// 

        /// The WM_NCMOUSELEAVE message is posted to a window when the cursor leaves the nonclient
        /// area of the window specified in a prior call to TrackMouseEvent.
        /// 
        NCMOUSELEAVE = 0x02A2,

        /// 

        /// The WM_WTSSESSION_CHANGE message notifies applications of changes in session state.
        /// 
        WTSSESSION_CHANGE = 0x02B1,

        TABLET_FIRST = 0x02c0,
        TABLET_LAST = 0x02df,

        /// 

        /// An application sends a WM_CUT message to an edit control or combo box to delete (cut)
        /// the current selection, if any, in the edit control and copy the deleted text to the
        /// clipboard in CF_TEXT format.
        /// 
        CUT = 0x0300,

        /// 

        /// An application sends the WM_COPY message to an edit control or combo box to copy the
        /// current selection to the clipboard in CF_TEXT format.
        /// 
        COPY = 0x0301,

        /// 

        /// An application sends a WM_PASTE message to an edit control or combo box to copy the
        /// current content of the clipboard to the edit control at the current caret position. Data
        /// is inserted only if the clipboard contains data in CF_TEXT format.
        /// 
        PASTE = 0x0302,

        /// 

        /// An application sends a WM_CLEAR message to an edit control or combo box to delete
        /// (clear) the current selection, if any, from the edit control.
        /// 
        CLEAR = 0x0303,

        /// 

        /// An application sends a WM_UNDO message to an edit control to undo the last operation.
        /// When this message is sent to an edit control, the previously deleted text is restored or
        /// the previously added text is deleted.
        /// 
        UNDO = 0x0304,

        /// 

        /// The WM_RENDERFORMAT message is sent to the clipboard owner if it has delayed rendering a
        /// specific clipboard format and if an application has requested data in that format. The
        /// clipboard owner must render data in the specified format and place it on the clipboard
        /// by calling the SetClipboardData function.
        /// 
        RENDERFORMAT = 0x0305,

        /// 

        /// The WM_RENDERALLFORMATS message is sent to the clipboard owner before it is destroyed,
        /// if the clipboard owner has delayed rendering one or more clipboard formats. For the
        /// content of the clipboard to remain available to other applications, the clipboard owner
        /// must render data in all the formats it is capable of generating, and place the data on
        /// the clipboard by calling the SetClipboardData function.
        /// 
        RENDERALLFORMATS = 0x0306,

        /// 

        /// The WM_DESTROYCLIPBOARD message is sent to the clipboard owner when a call to the
        /// EmptyClipboard function empties the clipboard.
        /// 
        DESTROYCLIPBOARD = 0x0307,

        /// 

        /// The WM_DRAWCLIPBOARD message is sent to the first window in the clipboard viewer chain
        /// when the content of the clipboard changes. This enables a clipboard viewer window to
        /// display the new content of the clipboard.
        /// 
        DRAWCLIPBOARD = 0x0308,

        /// 

        /// The WM_PAINTCLIPBOARD message is sent to the clipboard owner by a clipboard viewer
        /// window when the clipboard contains data in the CF_OWNERDISPLAY format and the clipboard
        /// viewer's client area needs repainting.
        /// 
        PAINTCLIPBOARD = 0x0309,

        /// 

        /// The WM_VSCROLLCLIPBOARD message is sent to the clipboard owner by a clipboard viewer
        /// window when the clipboard contains data in the CF_OWNERDISPLAY format and an event
        /// occurs in the clipboard viewer's vertical scroll bar. The owner should scroll the
        /// clipboard image and update the scroll bar values.
        /// 
        VSCROLLCLIPBOARD = 0x030A,

        /// 

        /// The WM_SIZECLIPBOARD message is sent to the clipboard owner by a clipboard viewer window
        /// when the clipboard contains data in the CF_OWNERDISPLAY format and the clipboard
        /// viewer's client area has changed size.
        /// 
        SIZECLIPBOARD = 0x030B,

        /// 

        /// The WM_ASKCBFORMATNAME message is sent to the clipboard owner by a clipboard viewer
        /// window to request the name of a CF_OWNERDISPLAY clipboard format.
        /// 
        ASKCBFORMATNAME = 0x030C,

        /// 

        /// The WM_CHANGECBCHAIN message is sent to the first window in the clipboard viewer chain
        /// when a window is being removed from the chain.
        /// 
        CHANGECBCHAIN = 0x030D,

        /// 

        /// The WM_HSCROLLCLIPBOARD message is sent to the clipboard owner by a clipboard viewer
        /// window. This occurs when the clipboard contains data in the CF_OWNERDISPLAY format and
        /// an event occurs in the clipboard viewer's horizontal scroll bar. The owner should scroll
        /// the clipboard image and update the scroll bar values.
        /// 
        HSCROLLCLIPBOARD = 0x030E,

        /// 

        /// This message informs a window that it is about to receive the keyboard focus, giving the
        /// window the opportunity to realize its logical palette when it receives the focus.
        /// 
        QUERYNEWPALETTE = 0x030F,

        /// 

        /// The WM_PALETTEISCHANGING message informs applications that an application is going to
        /// realize its logical palette.
        /// 
        PALETTEISCHANGING = 0x0310,

        /// 

        /// This message is sent by the OS to all top-level and overlapped windows after the window
        /// with the keyboard focus realizes its logical palette. This message enables windows that
        /// do not have the keyboard focus to realize their logical palettes and update their client areas.
        /// 
        PALETTECHANGED = 0x0311,

        /// 

        /// The WM_HOTKEY message is posted when the user presses a hot key registered by the
        /// RegisterHotKey function. The message is placed at the top of the message queue
        /// associated with the thread that registered the hot key.
        /// 
        HOTKEY = 0x0312,

        /// 

        /// The WM_PRINT message is sent to a window to request that it draw itself in the specified
        /// device context, most commonly in a printer device context.
        /// 
        PRINT = 0x0317,

        /// 

        /// The WM_PRINTCLIENT message is sent to a window to request that it draw its client area
        /// in the specified device context, most commonly in a printer device context.
        /// 
        PRINTCLIENT = 0x0318,

        /// 

        /// The WM_APPCOMMAND message notifies a window that the user generated an application
        /// command event, for example, by clicking an application command button using the mouse or
        /// typing an application command key on the keyboard.
        /// 
        APPCOMMAND = 0x0319,

        /// 

        /// The WM_THEMECHANGED message is broadcast to every window following a theme change event.
        /// Examples of theme change events are the activation of a theme, the deactivation of a
        /// theme, or a transition from one theme to another.
        /// 
        THEMECHANGED = 0x031A,

        /// 

        /// Sent when the contents of the clipboard have changed.
        /// 
        CLIPBOARDUPDATE = 0x031D,

        /// 

        /// The system will send a window the WM_DWMCOMPOSITIONCHANGED message to indicate that the
        /// availability of desktop composition has changed.
        /// 
        DWMCOMPOSITIONCHANGED = 0x031E,

        /// 

        /// WM_DWMNCRENDERINGCHANGED is called when the non-client area rendering status of a window
        /// has changed. Only windows that have set the flag DWM_BLURBEHIND.fTransitionOnMaximized
        /// to true will get this message.
        /// 
        DWMNCRENDERINGCHANGED = 0x031F,

        /// 

        /// Sent to all top-level windows when the colorization color has changed.
        /// 
        DWMCOLORIZATIONCOLORCHANGED = 0x0320,

        /// 

        /// WM_DWMWINDOWMAXIMIZEDCHANGE will let you know when a DWM composed window is maximized.
        /// You also have to register for this message as well. You'd have other windowd go opaque
        /// when this message is sent.
        /// 
        DWMWINDOWMAXIMIZEDCHANGE = 0x0321,

        /// 

        /// Sent to request extended title bar information. A window receives this message through
        /// its WindowProc function.
        /// 
        GETTITLEBARINFOEX = 0x033F,

        HANDHELDFIRST = 0x0358,
        HANDHELDLAST = 0x035F,
        AFXFIRST = 0x0360,
        AFXLAST = 0x037F,
        PENWINFIRST = 0x0380,
        PENWINLAST = 0x038F,

        /// 

        /// The WM_APP constant is used by applications to help define private messages, usually of
        /// the form WM_APP+X, where X is an integer value.
        /// 
        APP = 0x8000,

        /// 

        /// The WM_USER constant is used by applications to help define private messages for use by
        /// private window classes, usually of the form WM_USER+X, where X is an integer value.
        /// 
        USER = 0x0400,

        /// 

        /// An application sends the WM_CPL_LAUNCH message to Windows Control Panel to request that
        /// a Control Panel application be started.
        /// 
        CPL_LAUNCH = USER + 0x1000,

        /// 

        /// The WM_CPL_LAUNCHED message is sent when a Control Panel application, started by the
        /// WM_CPL_LAUNCH message, has closed. The WM_CPL_LAUNCHED message is sent to the window
        /// identified by the wParam parameter of the WM_CPL_LAUNCH message that started the application.
        /// 
        CPL_LAUNCHED = USER + 0x1001,

        /// 

        /// WM_SYSTIMER is a well-known yet still undocumented message. Windows uses WM_SYSTIMER for
        /// internal actions like scrolling.
        /// 
        SYSTIMER = 0x118
    }

    // WndProcDelegate http://www.pinvoke.net/default.aspx/user32/WndProcDelegate.html
    public delegate IntPtr WndProcDelegate(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);

    public delegate IntPtr WndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);

    // http://www.pinvoke.net/default.aspx/Structures.WNDCLASS
    [StructLayout(LayoutKind.Sequential)]
    public struct WNDCLASS
    {
        public ClassStyles style;

        [MarshalAs(UnmanagedType.FunctionPtr)]
        public WndProc lpfnWndProc;

        public int cbClsExtra;
        public int cbWndExtra;
        public IntPtr hInstance;
        public IntPtr hIcon;
        public IntPtr hCursor;
        public IntPtr hbrBackground;

        [MarshalAs(UnmanagedType.LPTStr)]
        public string lpszMenuName;

        [MarshalAs(UnmanagedType.LPTStr)]
        public string lpszClassName;
    }

    // check on this: http://www.pinvoke.net/default.aspx/Structures/WNDCLASSEX.html
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct WNDCLASSEX
    {
        [MarshalAs(UnmanagedType.U4)]
        public int cbSize;

        [MarshalAs(UnmanagedType.U4)]
        public int style;

        public IntPtr lpfnWndProc; // not WndProc -- careful
        public int cbClsExtra;
        public int cbWndExtra;
        public IntPtr hInstance;
        public IntPtr hIcon;
        public IntPtr hCursor;
        public IntPtr hbrBackground;
        public string lpszMenuName;
        public string lpszClassName;
        public IntPtr hIconSm;
    }

}

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