C#串口通信总结

转自：http://smartsoft.5d6d.com/thread-9132-1-1.html

 C#串口通信总结

 

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。
 
      串口调试助手.exe

       

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());
                    }
                }
    
       }

  }

 

rising:

直接转发的，需要确定。