COM回调实例,需要在客户端注册服务端类型库-COM callback example, the need for client-side type library registration services

利用后台工人线程自动休眠自动工作，充分展示delphi线程的优越性。涉及到delphi多线程同步、线程唤醒、线程间通讯技术。-A test for thread that works at background and call it on surface. It s include process s communitations and callback between process.

delphi 监控文件夹变化 自定义监控类采用消息回调方法，SHChangeNotifyDeregister注册响应消息。-delphi monitor folder changes using the custom control class the the message callback method, SHChangeNotifyDeregister registration response message.

通过ole回调操作mapinfo，实现地图功能，比较实用，而且已经编译完成。在网上有许多的文章介绍，但是不能在delphi下编译通过。-By ole callback operations mapinfo, realization of the map function, more practical, and has been compiled. There are many articles in the online descr iption, but not in delphi comp