RFID射频打卡系统上位机，VC6开发，使用windows API，定时器读串口，没有用到线程-windows application program about RFID，use windows API，read the serial port with timer but not thread

windows系统，c++语言的 通过RS232 （串口）操作RFID读写卡器的源代码(The windows system, the c++ language uses the RS232 (serial port) to operate the source code for the RFID read and write card)