How to disable beep sound when press key in MFC app?

Posted on 2007-12-06
Last Modified: 2008-02-01
HI Experst,
I have develop the MFC application that is not contains any editable control (it just contains frames/images/buttons control) so when I press any key it cause the sound as beep.

I need to disable this "BEEP" sound? how can I can do?
can we disable this? or can we add any "trick"  control to do this?
I have worked on this but I still can not find out how to disable
Pls give me your suggestion about how to disable this or give me some example for this.

Thank in advance!
Question by:Mobinex
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 20420613

Expert Comment

ID: 20420625
What I would do is catch the button press event. I think it was OnButtonDown.
When you will create this event, you will see code that usses the message to call another function,
for ex:  mainwindow::OnButtonDown, which means it propagates the message to the higher levels. All you need to do is to erase that code.

So when you press a button, your application will catch it with the event funtion, but will not do anything with it (including the beep signal)

Hope this helps

LVL 31

Accepted Solution

Zoppo earned 500 total points
ID: 20420713
Hi Mobinex,

I guess it's a dialog-application - even if it's a formview it should be the same ...

Just override your dialog's PreTranslateMessage and implement it somehow like this:

BOOL CMytDlg::PreTranslateMessage(MSG* pMsg)
      if ( pMsg->message == WM_KEYDOWN || pMsg->message == WM_KEYUP )
            switch ( pMsg->wParam )
            case( VK_RETURN ):
            case( VK_ESCAPE ):
            case( VK_SPACE ):
            case( VK_TAB ):
            case( VK_LEFT ):
            case( VK_RIGHT ):
            case( VK_UP ):
            case( VK_DOWN ):
                        return TRUE;
      else if ( pMsg->message == WM_SYSKEYDOWN || pMsg->message == WM_SYSKEYUP )
            switch ( pMsg->wParam )
            case( 'S' ):
            case( 'T' ):
                        return TRUE;

      return CDialog::PreTranslateMessage(pMsg);

This disables default handling of all keys except Space, Enter, ESC, TAB and the arrow keys ... in addition as a sample here all 'ALT+<key>' are blocked except for 'S' and 'T' - this should be done to avoid that pressing ALT-<key> beeps if it's not a shortcut in the dialog - for each shortcut in the dialog you need to add a 'case' in the 'else if' part ...

Hope that helps,


Author Comment

ID: 20424956
Thank Zoppo, it worked.

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