CODEWITHSUNDEEP
c++windowswinapimessagebox
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Reputation: 22327

How to close a MessageBox window by its handle with C++

I have a multi-threaded application that may display a MessageBox for a user's interaction. The message box itself is displayed from a worker thread, after a user picks a context menu command from the app's system tray icon, so the user can technically continue using the app while the message box is displayed. This works great until a user issues "Exit" command, at which point I need to find a way to close any open message boxes.

I did my homework and I was able to obtain HWND handle for the main (dialog) window of the message box (using this method.) I checked the HWND to be correct using Spy++, so HWND itself is not the issue. What happens is that when I do PostMessage(hMsgBoxWnd, WM_CLOSE, 0, 0); from another thread to the message box, it simply ignores this message and doesn't close.

Any idea how to close the message-box by its window handle?

Upvotes: 3

Views: 7194

Answers (2)

Remy Lebeau
Remy Lebeau

Reputation: 598001

MessageBox() simply does not process WM_CLOSE in all sitations:

SendMessage/PostMessage WM_CLOSE to MessageBox window does not always work

Upvotes: 1

stamhaney
stamhaney

Reputation: 1312

You should use PostThreadMessage to post to the threads specific message queue

Upvotes: 0

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