VC++局域网聊天程序，利用Socket套接字将主程序分为服务端和客户端两个部分。采用了UDP和TCP/IP相结合，有效提高了数据传输的时效性和稳定性。本程序还用到了多线程编程，用来解决程序自身阻塞的问题。(The VC ++ LAN chat program uses Socket to divide the main program into two parts: server and client. The combination of UDP and TCP / IP is adopted to effectively improve the timeliness and stability of data transmission. This program also uses multi-threaded programming to solve the problem of program blocking itself.)