随着计算机技术的进步和人民生活水平的提高，计算机已经走进了千家万户。计算机集娱乐休闲、办公、学习、上网冲浪等功能于一身，已经是许多家庭的必备品。尤其是上网冲浪已经成为一种潮流，是许多青年人的最爱。
Email 是现在很流行的一个词。它已经成为我们相互交流时不可缺少的工具。一个Email系统一般都由发送邮件和接收邮件两部分组成。不管接收系统还是发送系统都是基于一定的网络协议上的。一般的发送系统都是基于SMTP协议的，而接收系统一般都是基于IMAP协议或者POP3协议的。
POP3协议的命令少、简单、实用，实现起来相对简单，对硬件的处理能力和存储空间的要求低，符合嵌入式系统的各种要求。本软件就是基于POP3协议的邮件接收系统。它的主体部分是以VC 6.0为开发工具，通过C语言进行开发；界面部分是用DeltaGUI（Delta Graphical User Interface）开发的。DeltaGUI是构造嵌入式图形用户界面的应用开发包。本软件可以不经过修改或少许修改就可以移植到各种电子设备上。通过它,用户可以随时随地上网接收Email 。用户通过它可以不必先登陆各种网站而直接登陆邮箱，省去了不必要的时间和麻烦。而且本软件是一次性的从邮件服务器上把邮件下载下来，用户对邮件的各种操作不必再与服务器进行交互，而是在用户自己的计算机上进行，大大方便了用户。
本文共分为五章。第一章为概述，简单描述了嵌入式系统和Email相关的知识。第二章为系统开发相关技术简介，比较详细地介绍了POP3协议。第三章是系统设计。第四章为软件测试。
关键词：Email ; pop3协议 ; 嵌入式系统； 网络
Abstract
Along with the development of computer technology, more and more family own computer. The computer gathers the function of amusement leisure, transact, studystudy, internet access surfingbrowsing etc. function in whole body, have been essential things of many homes. The surfing of internet access have become a kind of fashion , being the favorite of many youths. A phrase of Email is very popular currently.
Email has become our indispensable tool in exchanges. An Email system generally makes up of two parts : send out the mail and receive the mail.
Both of sending system and receiving system base on definite specific network protocols. Most sending systems base on SMTP protocol, while most receiving systems base on IMAP protocol or POP3 protocol.
The POP3 protocol is little, simple, practical and simple to realize them, low demand for the hardware’s ability and storage. This The software described in the thesis of the software is a system of receiving email that based on POP3 protocol. The main body of the software is with VC 6.0 for the developing tool, with the language oand f C for the writing language. The interface part of the software is developed with the DeltaGUI( Delta Graphical User Interface). The DeltaGUI is an application developing tool for constructing users’ embedded graph interface . The software can be used in many kinds of electronics equipments. By it, users can access the internet and receive Email at any time and anywhere. And users need not land first every kind of website but directly land mailbox, leave out unnecessary time and troubles. And the software downloads all mails from the mail server at one time. For every kind of operations with the mail, users need not carry out alternation with server again, but deal with in users own computers.
This text is divided into five chapters. Chapter 1 is summarization for the whole text, describing some related knowledge of embedded system and Email. Chapter 2 is a brief introduction for the related technique, introducing in detail POP3 protocol .Chapter 3 is a system design. Chapter 4 introduces detailed testing process of software.
Key Words: Email ; pop3 protocol ;
embedded system ；network
目录
摘要（本论文范文的论文综述） 8
Abstract 10
第一章 软件总体概述 1
1.1嵌入式系统概述 1
1.1.1嵌入式系统定义 2
1.1.2嵌入式系统的工业特点 2
1.1.3 嵌入式具有的产品特征 3
1.1.4 嵌入式软件的特征 3
1.1.5嵌入式系统开发需要的开发工具 4
1.2 Email 介绍 5
第二章 系统开发相关技术简介 8
2.1协议总体介绍 8
2.1.1 pop3协议介绍 8
2.1.2 SMTP协议介绍 12
2.1.3 IMAP协议介绍 13
2.2 网络编程相关技术 15
2.2.1套接字A P I 16
2.2.2 SAStartup函数 17
2.2.3 SACleanup函数 17
2.2.4 socket函数 17
2.2.5 closesocket函数 18
2.2.6 send函数 19
2.2.7 recv函数 20
2.2.8 connect函数 21
2.3 DeltaGUI简介 22
2.3.1什么是DeltaGUI 22
2.3.2 DeltaGUI的功能 22
2.3.3 DeltaGUI的特点如下 23
2.3.4 DeltaGUI在嵌入式系统中的地位。 23
2.3.5 使用DeltaGUI进行应用设计与开发 24
第三章 系统设计 26
3.1 需求分析 26
3.2 总体设计 27
3.3 详细设计 30
3.3.1 连接服务器 30
3.3.2 文本信息处理 34
3.3.3 根据相关编码规则解码 35
3.3.4 界面的布局和显示 37
第四章 软件测试 42
结束语 46
致谢 47
参考文献 48
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