一个可以直接使用的串口操作类，这个类完成读、写和监视一个串口通信端口，当串行端口发生事件它会发送一个消息给其所属窗口，

该类创建一个读数据线程和一个写数据线程，使主程序不会被堵塞。-One can use the serial port operations, the completion of this class to read, write, and monitor a serial communications port, serial port when the event occurs it will send a message to the window to which it belongs, the class creates a thread to read data and write data to a thread , so that the main program will not be blocked.