C#串口操作实用类
Posted 叶帆
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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; }
}
}
{
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。
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