windows环境，监控文件夹变化。当文件夹内文件移动，删除，修改时产生消息通知。-for windows platform。Monitor the change of file directory.

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.