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;//接受結束狀態，true為成功接收到數據.    private byte[] reciveData = null;//接受到的數據存儲到這里.    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;//設置端口      serialPort.BaudRate = baudRate;//設置波特率      serialPort.DataBits = dataBits;//設置數據長度      serialPort.Parity = parity;//設置奇偶校驗協議      serialPort.StopBits = stopbits;//停止位      serialPort.ReceivedBytesThreshold = 1;//這里是讀事件觸發條件,1代表一個字節      serialPort.DtrEnable = true;//啟用數據終端就緒信號      serialPort.RtsEnable = true;//請求發送就緒信號      serialPort.DataReceived += new SerialDataReceivedEventHandler(Data_Recive);//綁定處理讀事件的函數.    }     public void SendBuff(byte[] data)    {      try      {                 serialPort.Write(data, 0, data.Length);//這里是寫            }      catch (Exception e)      {        if (serialPort != null && serialPort.IsOpen)        {          status = false; //這個status是我在上層類中判斷端口讀寫狀態的屬性,可以去掉          serialPort.Close();        }      }    }     void Data_Recive(object o, EventArgs e)//這個是讀端口,事件處理函數    {      try      {        Thread.Sleep(3);        int length = serialPort.BytesToRead;        reciveData = new byte[length];        serialPort.Read(reciveData, 0, length);        while (serialPort.BytesToRead != 0)//由于數據長度讀寫不一,而且時間很難確定,所以在這里做了這樣的處理        {          Thread.Sleep(1);        }        if (serialPort.IsOpen)        {          status = true;          //serialPort.Close();//這里不應該關閉,應當在更高層次的程序上關閉端口.        }      }      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>    /// 關閉端口    /// </summary>    public void PortClose()    {      if (serialPort != null && serialPort.IsOpen)      {        serialPort.Close();      }    }  }}