C#串口通信总结
我们知道对于标准DLL,可以采用DllImport进行调用。例如：
[DllImport("KMY350X.dll")]private static extern int OpenPort(int PortNum, int BaudRate);如果一些厂家比较懒的话，没有提供相应的dll,我们只能对它进行串口通信编程了。以前从没接触过串口编程，最近在一个项目中有几个地方都需要采用串口通信，跟公司一个老手请教后，感觉学到了很多东西，特在此做个总结:
一：首先我们来认识下什么是串口：
右键 我的电脑-管理-设备管理器-端口，选择一个端口，点击属性。
我们可以看到该串口的属性，在C#中我们使用SerialPort类来表示串口
ConfigClass config = new ConfigClass();
comm.serialPort.PortName = config.ReadConfig("SendHealCard"); //波特率 comm.serialPort.BaudRate = 9600; //数据位 comm.serialPort.DataBits = 8; //两个停止位 comm.serialPort.StopBits = System.IO.Ports.StopBits.One; //无奇偶校验位 comm.serialPort.Parity = System.IO.Ports.Parity.None; comm.serialPort.ReadTimeout = 100; comm.serialPort.WriteTimeout = -1;二：串口调试工具：
在对串口进行编程时候，我们要向串口发送指令，然后我们解析串口返回的指令。在这里向大家推荐一款工具。
将要发送的指令用空格隔开，选择HEX显示为放回的字符串。
三：正式编程：
编写Comm类:
public class Comm
{ public delegate void EventHandle(byte[] readBuffer); public event EventHandle DataReceived;public SerialPort serialPort;
Thread thread; volatile bool _keepReading;public Comm()
{ serialPort = new SerialPort(); thread = null; _keepReading = false; }public bool IsOpen
{ get { return serialPort.IsOpen; } }private void StartReading()
{ if (!_keepReading) { _keepReading = true; thread = new Thread(new ThreadStart(ReadPort)); thread.Start(); } }private void StopReading()
{ if (_keepReading) { _keepReading = false; thread.Join(); thread = null; } }private void ReadPort()
{ while (_keepReading) { if (serialPort.IsOpen) { int count = serialPort.BytesToRead; if (count > 0) { byte[] readBuffer = new byte[count]; try { Application.DoEvents(); serialPort.Read(readBuffer, 0, count); if(DataReceived != null) DataReceived(readBuffer); Thread.Sleep(100); } catch (TimeoutException) { } } } } }public void Open()
{ Close(); serialPort.Open(); if (serialPort.IsOpen) { StartReading(); } else { MessageBox.Show("串口打开失败！"); } }public void Close()
{ StopReading(); serialPort.Close(); }public void WritePort(byte[] send, int offSet, int count)
{ if (IsOpen) { serialPort.Write(send, offSet, count); } } }注册串口：
Comm comm = new Comm();
ConfigClass config = new ConfigClass(); comm.serialPort.PortName = config.ReadConfig("SendHealCard"); //波特率 comm.serialPort.BaudRate = 9600; //数据位 comm.serialPort.DataBits = 8; //两个停止位 comm.serialPort.StopBits = System.IO.Ports.StopBits.One; //无奇偶校验位 comm.serialPort.Parity = System.IO.Ports.Parity.None; comm.serialPort.ReadTimeout = 100; comm.serialPort.WriteTimeout = -1; comm.Open(); if (comm.IsOpen) { comm.DataReceived += new Comm.EventHandle(comm_DataReceived); }发送指令：
/// <summary>
/// 发卡到机口 /// </summary> private void SendCardToOut() { is_read_card = false; sendCardToOut = true; byte[] send = { 0x02, 0x46, 0x43, 0x34, 0x03, 0x30 }; if (comm.IsOpen) { comm.WritePort(send, 0, send.Length); } }收到指令，并解析：
void comm_DataReceived(byte[] readBuffer1)
{ //log.Info(HexCon.ByteToString(readBuffer)); if (readBuffer1.Length == 1) { receive = HealCardClass.ByteToString(readBuffer1); string str = "06"; if (string.Equals(receive.Trim(), str, StringComparison.CurrentCultureIgnoreCase)) { try { if (is_read_card) { byte[] send = new byte[1]; send[0] = 0x05; comm.WritePort(send, 0, send.Length); Thread.Sleep(500); comm.DataReceived -= new Comm.EventHandle(comm_DataReceived); InitReadComm(); } if (sendCardToOut) { byte[] send = new byte[1]; send[0] = 0x05; comm.WritePort(send, 0, send.Length);readComm.DataReceived -= new Comm.EventHandle(readComm_DataReceived);
readComm.Close();log.Info("发卡完成！");
lblMsg.Text = "发卡成功！"; lblSendCardMsg.Text = "发卡完成，请收好卡！"; timer1.Tick -= new EventHandler(timer1_Tick); PlaySound(); this.btnOK.Enabled = true;}
} catch (Exception ex) { log.Info(ex.ToString()); } } } }至此，串口通信编程告一段落