、采用 C/S 架构，通过多线程实现服务器与多个客户端之间的通信
2、在服务器端使用select、轻量级数据库 Sqlite3 管理
3、记录存储所有用户注册时的昵称、密码、个性签名、VIP 标志等
4、用到了C语言链表表示用户信息、文件编程、socket网络编程、多线程（服务器端）、sqlite3数据库存储等；
5、具体功能包括：注册、登录、修改密码、群聊、私聊、查看在线用户、设置个性签名、文件传输、查看聊天记录、注册会员等功能，VIP 会员还独享禁言、解禁、踢人等特殊功能。(Using C/S architecture to communicate the communication between the server and multiple clients through multithreading
2. Use select and lightweight database Sqlite3 management on the server side
3. Record the nicknames, passwords, personalities, VIP signs, and so on for the registration of all users
4, use the C language chain to represent user information, file programming, socket network programming, multithreading (server side), SQLite3 database storage, etc.
5, specific features include: registration, login, change password, group chat, private chat, online user view, set character signature, file transfer, check the records and membership functions to chat, VIP members are also banned, the lifting of the ban, forcing exclusive special functions.)