API函数写串口通讯,分别采用阻塞和轮训的方式接收数据，-WU

在delphi环境系，利用API编写的简单串口通讯程序，可以做为初学者学习API编程的例子-In Delhi environment department, use the API write simple serial interface communication program, and can be used as beginners learn API programming example

程序是如何调用API的串口函数，及通讯示例，不需要三方控件，可以设虚拟串口。-Program is how to call the API function serial and communication example, no third party controls, you can set up a virtual serial port.