1. socket通信：有客户端和服务端的socket代码。 2. 多线程：客户端和服务端各用一线程发送信息；服务端另有一监听线程，用于把超时的信息删除。 这里应用到了同步，使两个线程可以操作同一个map。 -1. Socket communications: There are client and service side of the socket code. 2. Multi-threading: client and server uses one threa

一个双线程安全的Pipe实现。一个线程在端读，另一个线程在另一端写，可以用做线程间通信。-A two-threads safe Pipe implement. One thread writes on the in-side, and another thread reads on the other side. U can use it to communicate in two threads. It s safe!

实现了聊天功能 局域网文件传输功能 分客户端和服务器端-File transfer is one of the most commonly used services on the Internet, a multi-threaded file transfer can effectively improve the file transfer speed and efficiency, this system use the Windows sockets implementation, So