自己写的串口通信类库，为异步读操作，使用时直接将lib文件加载如程序，判断串口是否可以，打开串口，读、写串口，关闭等，自己写的，满足一定的需求，不太完善-serial communication class library for the asynchronous read operation, use lib file is loaded directly into such programs to determine whether the serial port, open the ser