一个串口通信的ActiveX源码，可以方便快捷的使用此dll即可完成串口通信-A serial communication ActiveX source code, can be convenient to use this dll to complete the serial communication

DLL编程，主要涉及了串口控件的使用以及串口通信的实现，同时以DLL的方式调用-DLL programming, mainly related to the use of the serial port control, as well as the realization of serial communication, called the DLL manner