Re: Problen with OnKeyDown function

From:

"Doug Harrison [MVP]" <dsh@mvps.org>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sun, 30 Jul 2006 14:46:33 -0500

Message-ID:

<gl2qc2hc836elo05kr2c5o17c75n8nkh88@4ax.com>

On 30 Jul 2006 12:22:42 -0700, "hex" <triclosan@mail.ru> wrote:

I add OnKeyDown function to my dialog class COnKeyDownDlg but it
doesn't work correctly. I don't see any message boxes.

//////////////////
void COnKeyDownDlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
    // TODO: Add your message handler code here and/or call default
    AfxMessageBox("Test");

    switch(nChar)
    {
    case VK_END:
    AfxMessageBox("End Pressed");
        break;
    default:
    AfxMessageBox("default");
    }
    CDialog::OnKeyDown(nChar, nRepCnt, nFlags);
}
///////////////////

That message goes to the window with the focus, and your dialog doesn't
have the focus; one of its controls does. There are a couple of ways to
obtain the behavior you're after. If all focusable controls are bound to
MFC window objects, you can override PreTranslateMessage in the dialog
class and look for WM_KEYDOWN there, or you could hook an accelerator table
up and deal with TranslateAccelerator instead. There's also the possibility
of dynamically subclassing all the controls (but note that MFC doesn't
support nested subclassing using CWnd) and maybe even Windows hooks. But
exploiting PreTranslateMessage is the easiest way.

--
Doug Harrison
Visual C++ MVP