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Disable ALT-F4

Posted on 1998-12-21
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Last Modified: 2013-11-20
I have a full screen application which I would like to prevent exiting using ALT-F4.  How do I disable ALT-F4 from exiting my program?  The program is derived from CDialog and was written using MSVC 5.0.

Thanks for the help.
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Question by:oblong
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thresher_shark earned 600 total points
ID: 1326541
To disable the ALT-F4 key combination, you want to override the OnClose member function of your application.  To do this, do the following:
1) Open Class Wizard
2) Override the WM_CLOSE message
3) Leave the function blank.  i.e. replace:
   void CMyDlg::OnClose ()
   { CDialog::OnClose (); }
   
   with

   void CMyDlg::OnClose ()
   { }

The ALT-F4 combination sends a WM_CLOSE message which is not acted upon with the blank function.  Note that this will also disable the use of double clicking the system menu since ALT-F4 and double clicking it are essentially the same thing.  Make sure you provide an alternative means for your program to exit though!  If you have any further questions on any of the above, please feel free to ask.  Thanks!
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by:oblong
ID: 1326542
Thank you very much thresher.
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