将主端口COM8拆分成 COM1和COM2两个虚拟端口

 COM8接收的消息会传递给COM1和COM2

SerialPort spSend;//spSend,spReceive用虚拟串口连接，它们之间可以相互传输数据。spSend发送数据

SerialPort spReceive; //spReceive接受数据

private delegate void MyDelegate(string indata); //委托，处理接收的数据

private MyDelegate showDelegate = null;

 showDelegate = new MyDelegate(show);

 spReceive = new SerialPort("COM1", 19200, Parity.None, 8, StopBits.One);

spReceive.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler); //虚拟串口监听接收消息监听事件，该事件并不在主线程运行
spReceive.Open();//打开串口，工作完成时务必关闭串口

  void show(string indata)

{

//处理COM1接收的消息

}

private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)

{

 SerialPort sp = (SerialPort)sender;

this.Invoke(showDelegate, new object[] { sp.ReadExisting() });

}

软件：Serial Splitter 4.2