学步园

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<br /> {<br /> public event PortDataReceivedEventHandle Received;<br /> public event SerialErrorReceivedEventHandler Error;<br /> public SerialPort port;<br /> public bool ReceiveEventFlag = false; //接收事件是否有效 false表示有效<br /> public PortData(string sPortName, int baudrate,Parity parity,SerialInterface.SerialMode mode)<br /> {<br /> port = new SerialPort(sPortName, baudrate, parity, 8, StopBits.One);<br /> port.RtsEnable = true;<br /> port.ReadTimeout = 3000;<br /> port.DataReceived += new SerialDataReceivedEventHandler(DataReceived);<br /> port.ErrorReceived += new SerialErrorReceivedEventHandler(ErrorEvent);<br /> }<br /> ~PortData()<br /> {<br /> Close();<br /> }<br /> public void Open()<br /> {<br /> if (!port.IsOpen)<br /> {<br /> port.Open();<br /> }<br /> }<br /> public void Close()<br /> {<br /> if (port.IsOpen)<br /> {<br /> port.Close();<br /> }<br /> }<br /> //数据发送<br /> public void SendData(byte[] data)<br /> {<br /> if (port.IsOpen)<br /> {<br /> port.Write(data, 0, data.Length);<br /> }<br /> }<br /> public void SendData(byte[] data,int offset,int count)<br /> {<br /> if (port.IsOpen)<br /> {<br /> port.Write(data, offset, count);<br /> }<br /> }<br /> //发送命令<br /> public int SendCommand(byte[] SendData, ref byte[] ReceiveData,int Overtime)<br /> {<br /> if(port.IsOpen)<br /> {<br /> ReceiveEventFlag = true; //关闭接收事件<br /> port.DiscardInBuffer(); //清空接收缓冲区<br /> port.Write(SendData, 0, SendData.Length);<br /> int num=0,ret=0;<br /> while (num++ < Overtime)<br /> {<br /> if (port.BytesToRead >= ReceiveData.Length) break;<br /> System.Threading.Thread.Sleep(1);<br /> }<br /> if (port.BytesToRead >= ReceiveData.Length)<br /> ret = port.Read(ReceiveData, 0, ReceiveData.Length);<br /> ReceiveEventFlag = false; //打开事件<br /> return ret;<br /> }<br /> return -1;<br /> }<br /> public void ErrorEvent(object sender, SerialErrorReceivedEventArgs e)<br /> {<br /> if (Error != null) Error(sender, e);<br /> }<br /> //数据接收<br /> public void DataReceived(object sender, SerialDataReceivedEventArgs e)<br /> {<br /> //禁止接收事件时直接退出<br /> if (ReceiveEventFlag) return;<br /> byte[] data = new byte[port.BytesToRead];<br /> port.Read(data, 0, data.Length);<br /> if (Received != null) Received(sender, new PortDataReciveEventArgs(data));<br /> }<br /> public bool IsOpen()<br /> {<br /> return port.IsOpen;<br /> }<br /> }<br /> public delegate void PortDataReceivedEventHandle(object sender, PortDataReciveEventArgs e);<br /> public class PortDataReciveEventArgs : EventArgs<br /> {<br /> public PortDataReciveEventArgs()<br /> {<br /> this.data = null;<br /> }<br /> public PortDataReciveEventArgs(byte[] data)<br /> {<br /> this.data = data;<br /> }<br /> private byte[] data;<br /> public byte[] Data<br /> {<br /> get { return data; }<br /> set { data = value; }<br /> }<br /> }<br /> //【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。