一个支持窗口拖放的普遍类COleDropTargetEx，任何需要提供拖放的窗口包含此类后，将响应拖放消息函数加入，便可接收拖放-A universal support for drag and drop the window class COleDropTargetEx, no need to provide drag and drop the window contains such, it will respond by adding drag and drop message funct

Tcp通讯，客户端监听,server发消息client接收消息-Tcp communication, the client monitored, hair news server client receive news