C#串口编程实例代码

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Runtime.InteropServices;using System.Threading;using System.IO.Ports;namespace PacketsTest{      class ComSR  {    private SerialPort serialPort;    private bool status = false;//接受结束状态，true为成功接收到数据.    private byte[] reciveData = null;//接受到的数据存储到这里.    public bool Status    {      set { status = value; }      get { return status; }           }    public byte[] RecivedData    {      get { return reciveData; }    }    public SerialPort _SerialPort    {      get { return serialPort; }    }     public ComSR(string portName,int baudRate,int dataBits,Parity parity,StopBits stopbits)    {      serialPort = new SerialPort();      serialPort.PortName = portName;//设置端口      serialPort.BaudRate = baudRate;//设置波特率      serialPort.DataBits = dataBits;//设置数据长度      serialPort.Parity = parity;//设置奇偶校验协议      serialPort.StopBits = stopbits;//停止位      serialPort.ReceivedBytesThreshold = 1;//这里是读事件触发条件,1代表一个字节      serialPort.DtrEnable = true;//启用数据终端就绪信号      serialPort.RtsEnable = true;//请求发送就绪信号      serialPort.DataReceived += new SerialDataReceivedEventHandler(Data_Recive);//绑定处理读事件的函数.    }     public void SendBuff(byte[] data)    {      try      {                 serialPort.Write(data, 0, data.Length);//这里是写            }      catch (Exception e)      {        if (serialPort != null && serialPort.IsOpen)        {          status = false; //这个status是我在上层类中判断端口读写状态的属性,可以去掉          serialPort.Close();        }      }    }     void Data_Recive(object o, EventArgs e)//这个是读端口,事件处理函数    {      try      {        Thread.Sleep(3);        int length = serialPort.BytesToRead;        reciveData = new byte[length];        serialPort.Read(reciveData, 0, length);        while (serialPort.BytesToRead != 0)//由于数据长度读写不一,而且时间很难确定,所以在这里做了这样的处理        {          Thread.Sleep(1);        }        if (serialPort.IsOpen)        {          status = true;          //serialPort.Close();//这里不应该关闭,应当在更高层次的程序上关闭端口.        }      }      catch (Exception ex)      {        if (serialPort != null &&　serialPort.IsOpen)        {          status = false;          serialPort.Close();        }      }    }       public void PortOpen()    {      if (!serialPort.IsOpen)      {        serialPort.Open();      }      else      {        serialPort.Close();        serialPort.Open();      }    }    /// <summary>    /// 关闭端口    /// </summary>    public void PortClose()    {      if (serialPort != null && serialPort.IsOpen)      {        serialPort.Close();      }    }  }}