(In the android environment, use wifi to communicate with the computer socket instance, write the computer end program with C , use the mobile phone as the server, and use the computer as the client; Alternatively, the computer uses MFC programming as the client. The principle is that the mobile phone establishes a ServerSocket and obtains its own IP address and port; Then the computer connects to the IP: port of the phone through the socket. MFC programming is mainly used on the computer. Please refer to the example for socket code.)