使用Winsock建立因特网应用

How to use Winsock Control in order to build Internet applications

Winsock控件是包含在Visual Basic软件开发包中的一个强大的工具，它允许执行各种应用里面的任何因特网网络协议。比较其他ActiveX控件Winsock控件能够更好地完成许多网络方面的工作，并且易于控制和减少因使用其他控件而带来的错误。本文介绍了基本的网络通讯协议和Winsock通讯原理，文章说明了如何使用Winsock实现因特网应用开发及其程序编制方法，最后给出了相应的实例。

：The Winsock control shipped with Visual Basic is the very powerful tool. It allows implementing any Internet network protocol inside of your application. In comparance with any other ActiveX controls the Winsock control takes great deal of job. However the situation will be fully under your control and you won't depend on the mistakes of other control's developers. This paper introduces the basic knowledge of network protocols and principles of communications. It trying to explain how to program Winsock control and how to use it in order to implement any of the most widely used Internet protocols such as HTTP (WWW), FTP, NNTP (News), SMTP and POP3 (Mail).