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Disabling Alt-F4 Close Behavior

Posted on 1998-11-17
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Last Modified: 2013-11-20
I'm writing an application which will be displayed in a kiosk. I've successfully disabled almost everything that could potentially close the app, except for the ALT-F4 Close combination.

Can someone tell me how to disable ALT-F4?

Things I've tried:
1)
// Turn System Keys (like windows, alt-tab, etc) off
UINT nOldVal;
SystemParametersInfo (SPI_SCREENSAVERRUNNING, 1, &nOldVal, 0);

Very handy for turning off Windows Menu, CTRL-ALT-DEL, etc, but not ALT-F4!

2) Create a key accelerator for ALT-F4 and map it to an empty method. This didn't work.

3) Try catching WM_SYSKEYDOWN message in PreTranslateMessage. It seemed that the app closes before that method is called.

Thanks for your help,
bre++
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Question by:circuit
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thresher_shark earned 200 total points
ID: 1324860
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Expert Comment

by:thresher_shark
ID: 1324861
What you want to do is override the OnClose CWnd member function.  From what it looks like you've done already, you can probably figure out how to do this, but in any case:

1) Open your app's header.
2) Add:
   void OnClose ();

3) Open the CPP file
4) Add:
   void CMyApp::OnClose ()
   { }
5) Recompile

All done!

If you have any further questions regarding this problem, please feel free to ask.  Thanks!
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Author Comment

by:circuit
ID: 1324862
You gotta put it on the window class, not the app. Works great though! Thanks.
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