How to get a notification when windows prompt a dialog (i.e. error message)?

Question

the situation:

a user tries to copy a file to a directory he doesn't have write permission in, he will be prompted with a dialog box.

The requirement:

In a separate unrelated process, I want to get notified when this happens.

Possible solution paths:

1. subscribe to a system event if one exists.
2. using hooks

Is this even possible? which of the two is the preferred path?

a code example doing this would be a life saver...

Answer 1

Use SetWindowsHookEx() or SetWinEventHook() to receive notifications when a window is created and about to receive focus. You can then analyze the window contents to see if it matches what you are looking for and act accordingly.

Answer 2

将事件放到try块中，如果用户没有访问权限，它将失败并转到catch块，您可以在其中使用生成的异常来显示对话框