C# 串口软件

编写串口软件

 *在跟着别人写了一遍过后，发现串口软件会把原本一个整体的内容当成两次内容，导致显示出来的时候会发现内容会在中间出现换行*
 *通过尝试，在DataReceived事件触发后，不要立即从缓冲区读取发来的内容，设置Sleep等待50ms。然后就可解决问题*
1
2

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;

namespace PortHelper
{
	public partial class Form1:Form
	{
		private SerialPort SerialPort = new SerialPort();
		public Form1()
		{
			InitializeComponent();
			InitConfig();
		}
		
		private void InitConfig()
		{
			//GetPortNames()返回值是string[] ,自动返回你电脑上的串口名
			cbSerial.Items.AddRange(SerialPort.GetPortNames());
			if(cbSerial.Items.Count>0)
			{
				cbSerial.SelectedIndex = 0;
			}
			else
			{
				cbSerial.Text = "未检测到串口";
			}
			//对波特率的combobox项使用代码进行设置, 一般在控件上直接设置就好了
			string[] baudData = new String[] {"9600", "19200", "38400","57600", "115200","Custom"};
			cbBaudRate.Items.AddRange(baudData);
			cbBaudRate.SelectedIndex = 0;//作用:下拉列表框里会默认显示9600
			//对其他几个也进行默认设置
			cbDataBits.SelectedIndex = 3;//数据位列表框
            cbStop.SelectedIndex = 0;//停止位列表框
            cbParity.SelectedIndex = 0;//校验位列表框
            //所有的下拉框都不能随意输入内容,只能当选中特定项时才能输入
            cbSerial.DropDownStyle = ComboBoxStyle.DropDownList;
            cbBaudRate.DropDownStyle = ComboBoxStyle.DropDownList;
            cbDataBits.DropDownStyle = ComboBoxStyle.DropDownList;
            cbStop.DropDownStyle = ComboBoxStyle.DropDownList;
            cbParity.DropDownStyle = ComboBoxStyle.DropDownList;

			//默认状态下,编码方式设为ASCII
			radioButton1.Checked = true;

			SerialPort.DataReceived += new SerialDataReceivedEventHandler(Com_DataReceived);
		}
		
		private void Com_DataReceived(object sender, SerialDataReceivedEventArgs e)
		{
			//当这个事件解决器响应后,不要让它立刻去读缓冲区的内容,等50ms再读,
			//否则内容还没完全写到缓冲区内就被读走了,就会出现我开头出现的状况
			//添加了这个等待时间再去读取就不会出现一个完整的内容要读两次;一定要写在开头,不然也没用
            System.Threading.Thread.Sleep(50);
            从缓冲区读取数据到byte[]
            byte[] reDatas = new byte[SerialPort.BytesToRead];//BytesToRead字段:获取接收缓冲区中数据的字节数
            SerialPort.Read(reDatas, 0, reDatas.Length);
            //实现数据解码
            AddData(reDatas);
		}
		
		public void AddData(byte[] Data)
		{
			if(radioButton1.Checked)
			{
				AddContent(new ASCIIEncoding().GetString(Data));
			}
			else if(radioButton2.Checked)
			{
				StringBuilder sb = new StringBuilder();
				for(int i=0 ; i<Data.Length; i++)
				{
					sb.AppendFormat("{0:x2}" + " ", Data[i]);
				}
				//你若把上面的x换成X,下面这句中就不需要ToUpper()再去转换成大写了
				AddContent(sb.ToString().ToUpper());
			}
		}
		
		private void AddContent(string content)
        {
            BeginInvoke(new MethodInvoker(delegate
            {
            	//txtRecv是我控件的name
                txtRecv.AppendText(content + "\r\n");
                SerialPort.DiscardInBuffer();
            }));
        }
        
        private void start_button_Click(object sender, EventArgs e)
        {
        	if(SerialPort.IsOpen == false)
        	{
        		//把串口的属性配置好后，才能连接通信
                SerialPort.PortName = cbSerial.SelectedItem.ToString();
                SerialPort.BaudRate = Convert.ToInt32(cbBaudRate.Text.ToString());
                SerialPort.DataBits = Convert.ToInt32(cbDataBits.SelectedItem.ToString());
                SerialPort.StopBits =(StopBits)Convert.ToInt32(cbStop.SelectedItem.ToString());
                SerialPort.Parity = (Parity)Convert.ToInt32(cbParity.SelectedIndex.ToString());
                try
                {
                	SerialPort.Open();
                    send_button.Enabled = true;
                }
                catch(Exception ex)
                {
                    MessageBox.Show("未能成功开启串口");
                    return;
                }
                start_button.Text = "关闭";
           	}
        	else
        	{
        		try
                {
                    SerialPort.Close();
                    send_button.Enabled = false;
                }
                catch (Exception ex)
                {
                    MessageBox.Show("关闭失败");
                    
                }
                start_button.Text = "开启";
        	}
        	cbSerial.Enabled = !SerialPort.IsOpen;
            cbBaudRate.Enabled = !SerialPort.IsOpen;
            cbDataBits.Enabled = !SerialPort.IsOpen;
            cbStop.Enabled = !SerialPort.IsOpen;
            cbParity.Enabled =!SerialPort.IsOpen;
        }
        
        private void send_button_Click(object sender, EventArgs e)
        {
            byte[] sendData = null;
            if(radioButton1.Checked)
            {
                sendData = Encoding.ASCII.GetBytes(txtSend.Text.Trim());
            }
            else if(radioButton2.Checked)
            {
                sendData = ToHexFromString(txtSend.Text.Trim());
            }
            SerialPort.Write(sendData, 0, sendData.Length);
        }
        //这个函数我写的有些问题,后面再完善,不过对现在使用没影响
        private byte[] ToHexFromString(string str)
        {
            byte[] data = Encoding.ASCII.GetBytes(str);
            StringBuilder builder = new StringBuilder();
            for(int i=0;i<data.Length; i++)
            {
                builder.AppendFormat("{0:X2}" + " ", data[i]);
            }
            string strTemp = builder.ToString().Trim();
            string[] chars = strTemp.Split(new char[] {' '});

            byte[] hexByte = new byte[chars.Length];
            for(int i=0; i<chars.Length; i++)
            {
                hexByte[i] = Convert.ToByte(chars[i],16);
            }
            return hexByte;
        }
        
		private void clear_btn_Click(object sender, EventArgs e)
        {
            txtRecv.Clear();
        }
	}
	
}
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
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179

##问题
编写的时候参考内容链接:link