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();
      }
    }
  }
}