一个即时通讯的源码（类似qq），delphi写的。内有需要用到的控件，知识包括点对点，文件传输，界面等等方面知识。非常值得学习的代码。-A source of instant messaging (similar to qq), delphi written. Inside there is a need to use the control, knowledge, including peer-to-peer, file transfer, interface, etc. knowledge.