ABSTRACTABSTRACT Science and technology in the increasingly upgrades,network transmission tool isvaried,rich,and in the sea of the science and technology,the communication software seems to havebecome more important,it is the bridge of communication between people,it can help people tobetter finish the work,facilitate communication,make the work efficiency greatly improved,so thatthe person is unable to leave the network,without communication.Current,chat tools are many,such as QQ,WeChat,there is also a chat function,these are allneed to provide access to the Internet environment can chat,and these common chat tools forenterprise staff,but these tools have too many other entertainment functions,will affect theenterprise staffs work efficiency,in order to provide the efficiency of the enterprise staff,but also tothe needs of the staff to be able to timely communication,design and develop a local area network(LAN)based on QT technology integrating words and send the file of chat software.This design is based on the technology of QT and c++achieved send text messages,transferfiles,and other functions,in order to be able to have good scalability and maintainability,using QTCreator chat software application development,using the SQLite database for data storagemanagement,after the validation test,the system realized the function of chatting,achieved thedesign purpose.Key words:Chat;QT C++目录第1章绪论1.2国内外研究现状.1.3研究目标和方法21.4主要研究内容.…第2章相关技术简介.·42.1QT开发环境概述2.1.1QT特点..2.1.3QT对象通讯机制62.2编译调试工具简介第3章可行性分析.3.1经济可行性3.2技术可行性…3.3操作可行性3.4法律方面可行性分析第4章需求分析.…114.1需求分析….114.1.1功能需求分析.114.1.2性能需求分析4.2系统用例分析4.3类与对象模型.13第5章系统设计..145.1总体结构5.2系统流程设计…5.2.1事件跟踪图设计145.2.2状态图设计…155.2.3系统数据流图设计..155.3数据库设计17186.1系统主界面模块.186.2聊天室模块.…226.3发送接收文件模块27第7章系统测试.297.1软件测试的概念和原则297.2测试的过程297.3系统的运行环境.307.4系统维护….307.5系统存在的不足3031参考文献.3233