avoid changing window size

[RHL]

hello!
I know that api is to prevent resize a window
or style to be set (using radasm editor )
thanks  :bg

[dedndave]

well - there are a few things to work with
first, the window style
if you use WS_OVERLAPPEDWINDOW, that includes the WS_THICKFRAME style bit
WS_THICKFRAME (aka WS_SIZEBOX) creates a window with a sizing border
you can use WS_BORDER or WS_DLGFRAME (or no border) to create a window of fixed size

http://msdn.microsoft.com/en-us/library/windows/desktop/ms632600%28v=vs.85%29.aspx

another way to go is to answer WM_GETMINMAXINFO messages and limit or force the size

http://msdn.microsoft.com/en-us/library/windows/desktop/ms632626%28v=vs.85%29.aspx

[RHL]

dedndave but that styles take away some features to the window and I do not want that.
I just want to prevent changing the window size : P


PD: sorry lol I could do :) thanks u!

[dedndave]

in that case, handle the WM_GETMINMAXINFO messages

for example, if you want to force the window to be 400 x 300...

Code Select Expand

    .if uMsg==WM_GETMINMAXINFO
        mov     edx,lParam
        mov     ecx,400
        mov     eax,300
        mov     [edx].MINMAXINFO.ptMinTrackSize.x,ecx
        mov     [edx].MINMAXINFO.ptMinTrackSize.y,eax
        mov     [edx].MINMAXINFO.ptMaxTrackSize.x,ecx
        mov     [edx].MINMAXINFO.ptMaxTrackSize.y,eax
        xor     eax,eax
        ret
    .elseif uMsg==............

if you only set the Min values, they won't be able to make the window smaller than that size
if you only set the Max values, they won't be able to make the window larger than that size

[MichaelW]

One way to do it would be to handle the WM_SIZING message, change the members of the RECT structure pointed to by lParam to the size you want to maintain, and indicate that the message has been handled by returning TRUE.

Code Select Expand


;==============================================================================
    include \masm32\include\masm32rt.inc
;==============================================================================
    .data
        hwndButton HWND 0
        fLock      dd   0
        rc         RECT <>
    .code
;==============================================================================

DlgProc proc uses ebx hwndDlg:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM

    SWITCH uMsg

      CASE WM_INITDIALOG

        invoke GetDlgItem, hwndDlg, 1001
        mov hwndButton, eax

        ;------------------------------------
        ; Get the current size and store it.
        ;------------------------------------

        invoke GetWindowRect, hwndDlg, ADDR rc

      CASE WM_COMMAND

        SWITCH wParam

          CASE 1001

            .IF fLock

              invoke SetWindowText, hwndButton, chr$(" Lock Sizing ")

              mov fLock, 0

            .ELSE

              invoke SetWindowText, hwndButton, chr$("Unlock Sizing")

              mov fLock, 1

            .ENDIF

          CASE IDCANCEL

            invoke EndDialog, hwndDlg, 0

        ENDSW

      CASE WM_SIZING

        mov edx, lParam

        .IF fLock

          ;-------------------------------------------------------
          ; Sizing is locked, so copy our stored size to the RECT
          ; structure pointed to by lParam and indicate that the
          ; message has been processed by returning TRUE.
          ;-------------------------------------------------------

          push rc.left
          pop [edx].RECT.left
          push rc.top
          pop [edx].RECT.top
          push rc.right
          pop [edx].RECT.right
          push rc.bottom
          pop [edx].RECT.bottom

          return TRUE

        .ELSE

          ;--------------------------------------------------
          ; Sizing is not locked, so update our stored size.
          ;--------------------------------------------------

          push [edx].RECT.left
          pop rc.left
          push [edx].RECT.top
          pop rc.top
          push [edx].RECT.right
          pop rc.right
          push [edx].RECT.bottom
          pop rc.bottom

        .ENDIF

      CASE WM_CLOSE

        invoke EndDialog, hwndDlg, 0

    ENDSW

    return FALSE

DlgProc endp

;==============================================================================
start:
;==============================================================================

    Dialog "Test", "MS Sans Serif",10, \
           WS_OVERLAPPEDWINDOW or DS_CENTER, \
           1,0,0,80,63,1024

    DlgButton " Lock Sizing ",WS_TABSTOP,0,0,50,15,1001

    invoke GetModuleHandle, NULL
    CallModalDialog eax,0,DlgProc,NULL

    exit
;==============================================================================
end start


[Neil]

I have posted this code before somewhere :-

This creates a window 800 by 600 that cannot be resized.

Main proc hInst:HINSTANCE,hPrevInst:HINSTANCE,CmdLine:LPSTR,CmdShow:DWORD

      LOCAL wc:WNDCLASSEX
      LOCAL msg:MSG
      LOCAL hWnd:HWND

   mov   wc.cbSize,SIZEOF WNDCLASSEX
   mov   wc.style, CS_HREDRAW or CS_VREDRAW
   mov   wc.lpfnWndProc, OFFSET WndProc
   mov   wc.cbClsExtra,NULL
   mov   wc.cbWndExtra,NULL
   push  hInst
   pop   wc.hInstance
   mov   wc.hbrBackground,COLOR_BTNFACE+4
   mov   wc.lpszMenuName,OFFSET MenuName
   mov   wc.lpszClassName,OFFSET ClassName
   invoke LoadIcon,NULL,500
   mov   wc.hIcon,eax
   mov   wc.hIconSm,NULL
   invoke LoadCursor,NULL,IDC_ARROW
   mov   wc.hCursor,eax
   invoke RegisterClassEx, addr wc
   INVOKE CreateWindowEx,WS_EX_CLIENTEDGE,ADDR ClassName,ADDR AppName,\
           WS_OVERLAPPED+WS_CAPTION+WS_SYSMENU+WS_MINIMIZEBOX+WS_VISIBLE,\
           CW_USEDEFAULT,CW_USEDEFAULT,800,600,NULL,NULL,hInst,NULL
   mov  hWnd,eax
      DisplayMenu hWnd,600
      DisplayWindow hWnd,SW_SHOWNORMAL
      INVOKE UpdateWindow, hWnd

The parameters can be changed to suit.