ASM Community

Hi guys,
i have code running in a dll. It is necessary for me to redirect the WndProc of a window so that i can catch certain messages. When i make the call to SetWindowLong(), i get back the address to the old (original) wndProc, which i save.

The trouble is, how do i get the old wndproc to do default processing of messages when i receive control? As there is only two messages that i am interested in, how should i exit the new wndProc, as i have already done the default processing? Is it correct to do the default processing as soon as execution enters the new wndProc, as i want my handling to be the last in the chain?. Here is what i am doing now:

newWndProc proc  hWnd :HWND, uMsg :MSG, wParam :WPARAM, lParam :LPARAM

   ;do default process of this message first:

   push   lParam

   push   wParam

   push   uMsg

   push   hWnd

   mov    eax, oldWndProc

   call     dword ptr [eax]



   ;now intercept my messages:

   .IF uMsg == WM_CTLCOLORBUTTON

        ...code...

        ...code...

   .ELSE

        ??? what should i put here?

   .ENDIF



    xor   eax, eax  ;} are these 2 lines necessary?

    ret                   ;}

newWndProc endp

Thanks! :alright:

Hi Sami,
after checking the tuts on Icz's site, i have decided that i have been going in slightly the wrong direction, what i need to do is a straight job of subclassing the parent window, not superclassing. I will scream out if i have any further problems :)