串行端口编程的实例代码, 读书的习题, VC6.0 和 MSComm控件

可以同时打开四个串口，并分别发送和接收数据，用VC6.0-Four serial port can be opened at the same time and send and receive data, respectively, using VC6.0

使用VC6.0做的串口调试助手，该串口使用AC控件，可以实现数据的发送接收。-Using VC6.0 do serial debugging assistant, the serial port using AC control, can realize to send and receive data.