网络聊天工具的设计与实现.doc

学号: 南湖学院毕业设计题目: 网络聊天工具的设计与实现作者届别 2010 届系别机械与电子工程系专业计算机科学与技术指导老师职称讲师完成时间 2010 年5月 18日摘要视频聊天系统作为一种新型的通信和交流工具,突破了地域的限制,可以提供更为便捷、灵活、全面的音、视频信息的传递和服务,具有极其广泛的发展前景。本文介绍了采用 Microsoft Visual C++ 编程开发视频聊天系统的一套比较常用的解决方案。文字聊天采用 TCP 模式;语音视频聊天采用 UDP 模式,在客户端之间点对点的进行。在该方案中,通过函数库 VFW 来实现视频捕获、影像压缩以及影像播放。微软公司提供的专门用于视频捕获开发的工具包 VFW ,为在 Windows 操作系统中实现视频捕获提供了标准的接口,从而大大降低了程序的开发难度。在视频传输方面,则通过组建视频帧,将位图形式的视频帧压缩成帧格式的 Mpeg4 流,传输到客户端后,解压并显示影像。同时,在本方案中, 采用了线程来实现语音录制和语音回放,最终实现了通过服务器中转的文字聊天、点对点的语音视频聊天。关键词: 文字聊天;视频捕获;视频传输;语音录制与回放湖南理工学院南湖学院毕业设计(论文) II Abstract As a new tool munication, video chatting system has broken through geographical restrictions, has provides more convenient, flexible plete transmission and service. Furthermore, it has a very bright future. mon solution about how to develop a video chatting system is introduced by the Microsoft Visual C++ programming. TCP model is used in the text chatting and UDP for the point-to-point video chats between the Clients. In this plan, Video Capture, pression Manager and DrawDib are realized by the functions of VFW Library. The special kit VFW (Video for Windows) in video capture offered by Microsoft Corporation, has provided a standard interface for video capture in Windows Operating System and thus greatly reduced the hardship of programming. In video transmission aspect, it requires a video frame which pressed the video frame of bitmap into Mpeg4 steam of frame form. Then it will be pressed into images since it has been arrived the Client. Meanwhile, the thread is used to achieve audio recording and replaying. Finally, it has realized the text chatting through a server to transit, the point-to-point audio and video chats. Keywords: text chatting; Video Capture; video transmission; audio recording and playing 湖南理工学院南湖学院毕业设计(论文) III 目录摘要....................................................................................................... I ABSTRACT ...........................................................................................