Qt在Windows系统下检索U盘的插拔

1、检索U盘

//检索是否插入U盘U盘
void MainWindow::onSigDeviceChange(MSG *msg)
{
    mVectorDiskVolume.clear();
    PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)msg->lParam;
    switch(msg->wParam)
    {
    case DBT_DEVICETYPESPECIFIC:

        break;
    case DBT_DEVICEARRIVAL://系统检测到新设备

        if(lpdb->dbch_devicetype == DBT_DEVTYP_VOLUME)
        {

             PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
             if(lpdbv->dbcv_flags ==0)
             {
                 //插入u盘
                 QString USBDisk = QString(this->FirstDriveFromMask(lpdbv ->dbcv_unitmask));
                 mVectorDiskVolume.append(USBDisk);
                 setCheckBoxState();
             }
        }
        break;
    case DBT_DEVICEREMOVECOMPLETE://设备已丢失

        if(lpdb->dbch_devicetype == DBT_DEVTYP_VOLUME)
        {
            PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
            if(lpdbv->dbcv_flags == 0)
            {
                QString USBDisk = QString(this->FirstDriveFromMask(lpdbv ->dbcv_unitmask));
                mVectorDiskVolume.removeAt(mVectorDiskVolume.indexOf(USBDisk));
            }
        }
        break;
    default:
        break;
    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41

char MainWindow::FirstDriveFromMask(ULONG unitmask)
{
    char i;
    for (i = 0; i < 26; ++i)
    {
        if (unitmask & 0x1)
            break;
        unitmask = unitmask >> 1;
    }
    return (i + 'A');
}
1
2
3
4
5
6
7
8
9
10
11

重写nativeEvent函数

bool MainWindow::nativeEvent(const QByteArray &eventType, void *message, long *result)
{
    //MSG是个消息结构体，里面有类型、数据等。
    MSG* msg = reinterpret_cast<MSG*>(message);

    if (msg->message == WM_DEVICECHANGE)
    {
        emit(sigDeviceChange(msg));
    }

    if (eventType == "windows_generic_MSG" || eventType == "windows_dispatcher_MSG") {
        MSG* msg = static_cast<MSG *>(message);
        switch (msg->message)
        {
        case WM_KEYDOWN:
        case WM_SYSKEYDOWN:
            {
                if ((VK_F4 == msg->wParam) && (::GetKeyState(VK_MENU) & 0xF000))
                {

                    return TRUE;
                }
            }
            break;
        default:
            break;
        }
    }

    return QWidget::nativeEvent(eventType, message, result);
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

关联信号槽

 connect(this, SIGNAL(sigDeviceChange(MSG*)), SLOT(onSigDeviceChange(MSG*)));
1

头文件

#include 
#include "dbt.h"
1
2