【C#】串口操作实用类

    做工业通信有很长时间了,特别是串口(232/485),有VB/VC/C各种版本的串口操作代码,这些代码也经过了多年的现场考验,应该说是比较健壮的代码,但是目前却没有C#相对成熟的串口操作代码,最近用Moxa的设备开发基于WinCE5.0的串口操作代码,所以就扩充完善了一下串口操作,特别是SendCommand函数,这是我比较常用的主从通信代码,不喜欢用事件或线程接数据,在规定的超时时间内直接循环判断要接收的数据。

     下面是具体的代码:   

   public   class  PortData
    {
        
public   event  PortDataReceivedEventHandle Received;
        
public   event  SerialErrorReceivedEventHandler Error; 
        
public  SerialPort port;
        
public   bool  ReceiveEventFlag  =   false ;   // 接收事件是否有效 false表示有效

        
public  PortData( string  sPortName,  int  baudrate,Parity parity,SerialInterface.SerialMode mode)
        {
            port 
=   new  SerialPort(sPortName, baudrate, parity,  8 , StopBits.One);
            port.RtsEnable 
=   true ;
            port.ReadTimeout 
=   3000 ;
            port.DataReceived 
+=   new  SerialDataReceivedEventHandler(DataReceived);
            port.ErrorReceived 
+=   new  SerialErrorReceivedEventHandler(ErrorEvent);
        }

        
~ PortData()
        {
            Close();
        }
        
public   void  Open()
        {
            
if  ( ! port.IsOpen)
            {           
                port.Open();
            }
        }

        
public   void  Close()
        {
            
if  (port.IsOpen)
            {
                port.Close();
            }
        }
        
// 数据发送
         public   void  SendData( byte [] data)
        {
            
if  (port.IsOpen)
            {
                port.Write(data, 
0 , data.Length);
            }
        }
        
public   void  SendData( byte [] data, int  offset, int  count)
        {
            
if  (port.IsOpen)
            {
                port.Write(data, offset, count);
            }
        }
        
// 发送命令
         public   int  SendCommand( byte [] SendData,  ref    byte [] ReceiveData, int  Overtime)
        {

            
if (port.IsOpen)
            {
                ReceiveEventFlag 
=   true ;         // 关闭接收事件
                port.DiscardInBuffer();          // 清空接收缓冲区                 
                port.Write(SendData,  0 , SendData.Length);
                
int  num = 0 ,ret = 0 ;
                
while  (num ++   <  Overtime)
                {
                    
if  (port.BytesToRead  >=  ReceiveData.Length)  break ;
                    System.Threading.Thread.Sleep(
1 ); 
                }
                
if  (port.BytesToRead  >=  ReceiveData.Length) 
                    ret 
=  port.Read(ReceiveData,  0 , ReceiveData.Length);
                ReceiveEventFlag 
=   false ;        // 打开事件
                 return  ret;
            }
            
return   - 1 ;
        }

        
public   void  ErrorEvent( object  sender, SerialErrorReceivedEventArgs e)
        {
            
if  (Error  !=   null ) Error(sender, e);
        }
        
// 数据接收
         public   void  DataReceived( object  sender, SerialDataReceivedEventArgs e)
        {
            
// 禁止接收事件时直接退出
             if  (ReceiveEventFlag)  return ;

            
byte [] data  =   new   byte [port.BytesToRead];
            port.Read(data, 
0 , data.Length);
            
if  (Received  !=   null ) Received(sender,  new  PortDataReciveEventArgs(data));
        }

        
public   bool  IsOpen()
        {
            
return  port.IsOpen;
        }
    }
    
public   delegate   void  PortDataReceivedEventHandle( object  sender, PortDataReciveEventArgs e);
    
public   class  PortDataReciveEventArgs : EventArgs
    {
        
public  PortDataReciveEventArgs()
        {
            
this .data  =   null ;
        }

        
public  PortDataReciveEventArgs( byte [] data)
        {
            
this .data  =  data;
        }

        
private   byte [] data;

        
public   byte [] Data
        {
            
get  {  return  data; }
            
set  { data  =  value; }
        }
    }

【附注】1~9 串口的名称是 "COMx:",>9的以前用\\\\.\\COMx:比较好使,但是在moxa 661设备上却不行,要用如下格式"$device\\COM" + PortNo.ToString() + "\0",也许这是moxa修改了相应的串口驱动。

 

 

//注:把代码中的public PortData(string sPortName, int baudrate,Parity parity,SerialInterface.SerialMode mode) 最后一个参数去掉。
PortData comPort = new PortData("COM1:", 115200, Parity.Even);
byte[] bytSendArray = new byte[2]; //发送数据缓冲区
bytSendArray[0]=0xAC;
bytSendArray[2]=0xAA;
byte[] bytReceiveArray = new byte[5];
//该命令潜台词是你发送了两个字节的数据0xAC,0xAA 下位机应该在200毫秒超时内返回5个字节的数据
intReceiveNum = comPort.SendCommand(bytSendData, ref bytReceiveArray, 200);
//intReceiveNum为实际返回的数据个数,返回的数据放在bytReceiveArray中
comPort.Close();
该代码适合主从式通信(一应一答方式)

 

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