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(jié)束狀態(tài)，true為成功接收到數(shù)據(jù).
    private byte[] reciveData = null;//接受到的數(shù)據(jù)存儲(chǔ)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(shè)置端口
      serialPort.BaudRate = baudRate;//設(shè)置波特率
      serialPort.DataBits = dataBits;//設(shè)置數(shù)據(jù)長(zhǎng)度
      serialPort.Parity = parity;//設(shè)置奇偶校驗(yàn)協(xié)議
      serialPort.StopBits = stopbits;//停止位
      serialPort.ReceivedBytesThreshold = 1;//這里是讀事件觸發(fā)條件,1代表一個(gè)字節(jié)
      serialPort.DtrEnable = true;//啟用數(shù)據(jù)終端就緒信號(hào)
      serialPort.RtsEnable = true;//請(qǐng)求發(fā)送就緒信號(hào)
      serialPort.DataReceived += new SerialDataReceivedEventHandler(Data_Recive);//綁定處理讀事件的函數(shù).
    }
 
    public void SendBuff(byte[] data)
    {
      try
      {
         
        serialPort.Write(data, 0, data.Length);//這里是寫(xiě)      
      }
      catch (Exception e)
      {
        if (serialPort != null && serialPort.IsOpen)
        {
          status = false; //這個(gè)status是我在上層類(lèi)中判斷端口讀寫(xiě)狀態(tài)的屬性,可以去掉
          serialPort.Close();
        }
      }
    }
 
    void Data_Recive(object o, EventArgs e)//這個(gè)是讀端口,事件處理函數(shù)
    {
      try
      {
        Thread.Sleep(3);
        int length = serialPort.BytesToRead;
        reciveData = new byte[length];
        serialPort.Read(reciveData, 0, length);
        while (serialPort.BytesToRead != 0)//由于數(shù)據(jù)長(zhǎng)度讀寫(xiě)不一,而且時(shí)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(yīng)該關(guān)閉,應(yīng)當(dāng)在更高層次的程序上關(guān)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(guān)閉端口
    /// </summary>
    public void PortClose()
    {
      if (serialPort != null && serialPort.IsOpen)
      {
        serialPort.Close();
      }
    }
  }
}