日期:2014-05-19  浏览次数:20715 次

怎么用C#2005自带的串口类发送和接收ASCII大于127的字符呢
如上,郁闷的要死   ~

------解决方案--------------------
这就是一个串口通信类:
【C#】串口操作实用类2007-05-02 09:53 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。

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;
}