基于VB的即时通信系统毕业设计（毕业学术论文设计）.docVIP

摘 要 即时通讯(Instant Messaging)是目前Internet上最为流行的通讯方式，而各 种各样的即时通讯软件也层出不穷；服务提供商也提供了越来越丰富的通讯服务 功能。随着互联网的发展，即时通讯的运用将日益广泛。 本文围绕即时通讯的基本文字交流功能，设计了管理在线用户，维护在线用 户，实现文字通信的功能。本系统使用TCP和UDP协议作为传输层的协议，更加便 捷了用户之间的通讯和交友。 该系统为用户提供了一个集文字通信、在线信息、文件传输于一体的即时通 信平台。经过几个月的项目开发、测试，本即时通讯系统现已可以正常运行。 关键词：TCP/IP，C/S，Winsock，即时通信系统，Visual Basic ABSTRACT Instant Messaging is currently the most popular way to communicate on the Internet，by the way various Instant Messaging software have been continuously appearing; Service provider offers more and more communication services nowadays. As the development of the Internet, Instant Messaging will perform a wider use and is growing up day after day. This thesis is based on the function of exchange, which is the basic character of instant messaging system, online users management, safeguarding online users and exchange message are come true. This system has offered an instant messaging platform incorporating characters communication, online information and file transfer. Through several months develop and test cycle, this instant messaging system can already used to run now. Keywords: TCP/IP, C/S, Winsock, Instant Messenger System, Visual Basic 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc171915388 摘要 PAGEREF _Toc171915388 \h I HYPERLINK \l _Toc171915389 ABSTRACT PAGEREF _Toc171915389 \h II HYPERLINK \l _Toc171915390 第1章 绪论 PAGEREF _Toc171915390 \h 1 HYPERLINK \l _Toc171915391 1.1 研究背景及意义 PAGEREF _Toc171915391 \h 1 HYPERLINK \l _Toc171915392 1.2 网络即时通信软件的现状 PAGEREF _Toc171915392 \h 2 HYPERLINK \l _Toc171915393 1.3 本文的内容安排 PAGEREF _Toc171915393 \h 3 HYPERLINK \l _Toc171915394 第2章 实现网络即时通信软件的相关知识 PAGEREF _Toc171915394 \h 5 HYPERLINK \l _Toc171915395 2.1 Winsock的原理 PAGEREF _Toc171915395 \h 5 HYPERLINK \l _Toc171915396 2.2 TCP/IP协议的原理 PAGEREF _Toc171915396 \h 6 HYPERLINK \l _Toc171915397 2.3 C/S结构的概述 PAGEREF _Toc171915397 \h 7 HYPERLINK \l _Toc171915398 2.4 基于Socket通信的基本应用模式 PAGEREF _Toc171915398 \h 8 HYPERLINK \l _Toc171915399 2.