🚀 go-pugleaf

<snip> Now I'd like EditWindowProc to be a member function of tEdit so I can
> call some of tEdit's member functions. Is there any way to achieve this?
> (Static member functions could be a solutions, as there's momentarily
> exactly one instance of tEdit in the whole app. But if there's a way
> without using static member function I'd prefer that.)
>
>
> Thanks,
> Martin

This is what I did. I have a static WinProc for each base class and use
SetWindowLong(HWnd,GWL_USERDATA,(long) this); in the constructor to tie the
window handle to the class object. This is not all there is to the problem.
You must take care to break the connection between GWL_USERDATA and the
handle when the object is deleted or the window is destroyed. And you must
not use GWL_USERDATA for anything else, natch ;-)
Any comments concerning this approach are welcome.

Best regards,
Gary

#include <windows.h>
#pragma hdrstop
#include "CREdit.h"

static LRESULT CALLBACK WndProc(HWND hWnd, UINT iMsg, WPARAM wParam, LPARAM
lParam)
{
 CREdit * me = (CREdit *)GetWindowLong(hWnd,GWL_USERDATA);
 if (me)
  return me->WndProc(hWnd, iMsg, wParam, lParam);

   return DefWindowProc(hWnd, iMsg, wParam, lParam);
 }

 return FALSE;
}
/*
 Setup a subclass for edit boxes.
 Save the current message handler
 Set the message handler to our own.
 Messages that out handler can not handle will be sent to the original
*/

CREdit::CREdit(HWND papa,UINT controlID)
 {
 HWnd = GetDlgItem(papa, controlID);
 if (HWnd) {
  PrevProc = (WNDPROC) GetWindowLong(HWnd,GWL_WNDPROC);
  SetWindowLong(HWnd,GWL_WNDPROC, (long) ::WndProc);
  SetWindowLong(HWnd,GWL_USERDATA,(long) this);
 }
}