Re: Catch WM_SIZE

From:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 14 Aug 2008 21:42:31 -0400

Message-ID:

<eOlR6gn$IHA.792@TK2MSFTNGP02.phx.gbl>

"Erakis" <Erakis@discussions.microsoft.com> wrote in message
news:AFF68A17-38AB-40AE-B5D2-E0DB72BA34C5@microsoft.com...

  MyControlOldWndProc = SetWindowLong(m_MyControl, GWL_WNDPROC,
(long)MyControlCtrlNewWndProc);
  ...
}

LRESULT CALLBACK MyControlCtrlNewWndProc(HWND hWnd, UINT Message, WPARAM
wParam, LPARAM lParam)
{
switch(Message)
{
   case WM_SIZE :
LRESULT result = CallWindowProc( (WNDPROC)TrappeOldWndProc, hWnd, NULL,
wParam, lParam);

              // Do realign stuff...

return result;
break;
}

// Call default function
return CallWindowProc((WNDPROC)MyControlOldWndProc, hWnd, Message,
wParam,
lParam);
}

What are you thinking of this solution ?

These techniques are the wrong way to do it when using MFC. MFC has already
subclassed the control so you are conflicting with it. And your wndproc's
cannot be members of the class because they must be static functions.

Catch the WM_SIZE message in your control class using the message map. Then
if you need to notify the parent window, your control's OnSize message
handler can do GetParent()->SendMessage(YOUR_CUSTOM_MESSAGE, ....);

--
Scott McPhillips [VC++ MVP]