Is there any difference between a virtual serial port and a real serial port? If I have a VC program that can send and receive data from a real serial port, is it also applicable to a virtual serial port? It has no effect on your program in terms of expression. However, if a real serial port is used, it is generally necessary to link devices or other computers on the physical serial port to send and receive data; Virtual serial ports should appear in pairs, and another program needs to link another virtual serial port to send and receive data.

When using it, you really only need to modify the serial number in your program.

It is particularly important to note that _ t ("comx") is used when going from COM 1 to COM9, while _ t (\ \ \. \ \ comxxx) is required if it exceeds 10.