一个用VC API写的串口通讯程序，很适合初学者，能以此例程基础上设计更多功能的界面-One with VC API to write the serial communication program, it is suitable for beginners, this routine can be designed on the basis of the interface more features

文件主要是实现API串口通讯，示例了MFC的串口类和API函数的使用，对学习API串口通信的人有帮助。-Document is mainly to achieve API serial communication, the example of the MFC serial port class and the use of API function, the study of API serial communication to help people.