The principle of realizing TCP and UDP network service with Windows socket is introduced. At the same time,a method of Visual Basic programming of client/server application program based on TCP and UDP protocol with Winsock is introduced in this paper.

• 介绍了利用Windows Socket 实现TCP和UDP网络服务的原理及在Visual Basic 环境下如何使用Winsock 控件编制基于TCP和UDP协议的客户/ 服务器应用程序的方法。