Subclass edit control

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Synaps3

Joined: 06 Jul 2011
Posts: 6

Synaps3

I am trying to subclass an edit control so that I can detect when a key is pressed in the control. I have some code that is not working.

Code:

;=======================================================================
format PE GUI 4.0
;=======================================================================
include 'win32ax.inc'    ;*
include 'rc.inc'        ;*
;=======================================================================
section '.code' code readable executable

entry $

    invoke GetModuleHandle,0
    mov [hInstance],eax
    invoke DialogBoxParam,eax,D_MAIN,0,dlg_proc,0
    invoke ExitProcess,0

;=======================================================================
proc dlg_proc, hWnd, uMsg, wParam, lParam
    cmp [uMsg],WM_CLOSE
    jne @F
.end_dlg:
    invoke EndDialog,[hWnd],0
.exit_true:
    mov eax,TRUE
    ret
@@:
;-----------------------------------------------------------------------
    cmp [uMsg],WM_INITDIALOG
    jne @F
    invoke GetDlgItem,[hWnd],EDIT_1
    mov [hwndEdit],eax
    invoke SetWindowLong,hwndEdit,GWL_WNDPROC,dword [TheEditProc]
    mov [OldWndProc],eax
    jmp .exit_true
@@:
.exit_false:
    xor eax,eax
    ret
endp
;=======================================================================
proc TheEditProc, hWnd, uMsg, wParam, lParam
    cmp [uMsg],WM_CHAR
    jne @F
    invoke MessageBox,NULL,"fhuiahei","hfeihfwauif",MB_ICONINFORMATION
@@:
    invoke CallWindowProc,[OldWndProc],[hWnd],[uMsg],[wParam],[lParam]
    xor eax,eax
    ret
endp

07 Jul 2011, 19:28

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17874
Location: In your JS exploiting you and your system

revolution

This looks more likely to work:

Code:

invoke SetWindowLong,[hwndEdit],GWL_WNDPROC,TheEditProc

I haven't checked any of the other lines, so there might, or might not, be other problems. I couldn't test it because the code you posted is incomplete.

07 Jul 2011, 19:35

typedef

Joined: 25 Jul 2010
Posts: 2914
Location: 0x77760000

typedef

hmm odd

07 Jul 2011, 23:02

FrozenKnight

Joined: 24 Jun 2005
Posts: 128

FrozenKnight

I have a working edit control subclass here.
i use the following code to set it up.

Code:

  push  IDI_FLOATNUMBER
  push  [hdlg]
  call  [GetDlgItem]
  push  fltedit_proc
  push  GWL_WNDPROC
  push  eax
  call  [SetWindowLong]
  cmp   eax, 0
  jz    .wmclose
  mov   [proc_edit], eax

I don't really like using the invoke syntax, but i think that revolution probably caught your problem. Since the subclass i used appears closely related to what your doing i think my example may help a little with other issues. (again sorry about not using the familiar invoke but i really do prefer using the push/pop notation.)

08 Jul 2011, 17:56

Synaps3

Joined: 06 Jul 2011
Posts: 6

Synaps3

I made the changes you suggested, it still doesn't work, but it did change. Now the edit control is unresponsive. The only way I can move the caret into it is by pressing the tab key, but when I try to type in the box, nothing happens. It doesn't accept text. Any other suggestions.

Thanks for the help.

09 Jul 2011, 19:55

typedef

Joined: 25 Jul 2010
Posts: 2914
Location: 0x77760000

typedef

can you post rc.inc please

09 Jul 2011, 21:18

bitshifter

Joined: 04 Dec 2007
Posts: 781
Location: Massachusetts, USA

bitshifter

Also my BitBox utility uses EDIT subclassing.
It may provide some good reference.
I subclass two edit controls into one proc Smile

http://board.flatassembler.net/topic.php?t=11615

10 Jul 2011, 16:40

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