说明：  Visual C++为我们提供了一种好用的ActiveX控件Microsoft Communications Control(即MSComm)来支持应用程序对串口的访问，在应用程序中插入MSComm控件后就可以较为方便地实现对通过计算机串口收发数据。
(Visual C to provide us with a handy Microsoft ActiveX controls Communications Control (MSComm) to support the applications of Serial visit the application MSComm inserted after it more convenient to the computer through serial data transceiver.)