use FindChangeNotification or SHChangeNotifyRegister
1. http://www.mvps.org/vbnet/index.html?code/fileapi/watchedfolder.htm
2. http://www.mvps.org/vbnet/index.html?code/shell/shchangenotify.htm
1. http://www.mvps.org/vbnet/index.html?code/fileapi/watchedfolder.htm
2. http://www.mvps.org/vbnet/index.html?code/shell/shchangenotify.htm
下面有一个 ShellExecute Hook项就是