Automatic identification of c + + serial program, sending the correct instruction format, with another machine to receive, to receive the full is 0 (the hair is not zero), but before that the program (a serial port communication, send and receive all no problem, each time will be like this, and change the USB port or restart:) perform again, again an existing program, accept normal, excuse me what reason???

CodePudding user response:

Estimate your program exits didn't release the serial port resources!
Lead to a serial port is being used