当用户清空垃圾箱时，如何通知我的 Cocoa 应用程序？
我的应用程序将一些文件放入垃圾箱，但也实现了撤消功能以将它们再次拉出。我需要知道用户是否清空垃圾箱，以便我可以清空我的撤消堆栈。
我是否需要监视文件系统事件才能实现此目的，或者是否有更简单的方法？
My app puts some files in the trash, but also implements undo to pull them back out again. I need to know if the user empties the trash so I can empty my undo stack.
Do I need to monitor file system events to achieve this, or is there an easier way?
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（3）
您可能最终不得不观看 ~/.Trash，但是当垃圾箱被清空时，会发布一条通知。它的名字是
“com.apple.carbon.core.DirectoryNotification”（其他时候也发布过），但它的userInfo中似乎没有任何内容。但是，它确实有一个字符串作为对象，因此可能包含一些相关信息。我的快速测试似乎表明事实并非如此。 （它看起来像一个类似于"FNObject 555279-101"的字符串）You'll probably have to end up watching ~/.Trash, but there is a notification posted when the trash is emptied. Its name is
"com.apple.carbon.core.DirectoryNotification"(which is also posted at other times), but it doesn't seem to have anything in the userInfo. However, it does have a string as the object, so that might contain some relevant information. My quick tests seem to indicate that it doesn't. (It looks like a string that's something like"FNObject 555279-101")您可以使用 UKKQueue 来观看文件更改（空鞭打）通知：
http://www.cocoadev.com/index.pl?UKKQueue
You can use UKKQueue to watch file change (empty thrash) notifications:
http://www.cocoadev.com/index.pl?UKKQueue
另一种选择是使用
FNSubscribe或FNSubscribeByPath。该通知不会告诉您到底发生了什么，只是告诉您您订阅的目录发生了一些情况。Another option is to use
FNSubscribeorFNSubscribeByPath. The notification won't tell you exactly what happened, just that something happened to the directory you subscribed to.