GetWindowExtex

[clamicun]

I test a prog on 2 computers.
One is very old - win7 - resolution 1024x768.
The other one has a larger resolution.

The program window  is 620x480 px.

So the looks on the displays are quite different.
I want to check the Displaysize (resolution) before the start.

;---
Get_My_Window proc

INVOKE GetWindowDC,0    ;0 = whole desktop ? 
mov hdc,eax
INVOKE ReleaseDC,0,hdc  ;for further use 

INVOKE GetWindowExtEx,hdc,offset _SIZE  ;without ReleaseDC the prog goes down
;result here is 0 = wrong

;_SIZE.x = 0
;_SIZE.y = 4

ret
Get_My_Window endp
;---

Is GetWindowExtEx the correct function to check the resolution ?
Someone please can help me.

[jj2007]

There are various options, here are two:

include \masm32\MasmBasic\MasmBasic.inc      ; download
  SetGlobals rc:RECT
  Init
  lea eax, rc
  push eax
  push rv(GetDesktopWindow)
  call GetClientRect
  Print Str$("Width=%i", rc.right), Str$(", Height=%i\n", rc.bottom)
  invoke SystemParametersInfo, SPI_GETWORKAREA, 0, addr rc, 0      ; fills a RECT
  pop ecx
  pop eax
  Inkey Str$("Width=%i", rc.right), Str$(", Height=%i\n", rc.bottom)
EndOfCode

Output:
Width=1366, Height=768
Width=1366, Height=740

[Vortex]

Hello clamicun,

Can you test the example below?

Code Select Expand

include     \masm32\include\masm32rt.inc

.data

str1        db 'Width = %u',13,10,'Height = %u',0

.code

start:

    call    main
    invoke  ExitProcess,0

main PROC USES esi

LOCAL rect:RECT

    invoke  GetDesktopWindow
    lea     esi,rect
    invoke  GetWindowRect,eax,esi
   
    invoke  crt_printf,ADDR str1,\
            RECT.right[esi],\
            RECT.bottom[esi]
    ret

main ENDP

END start

[clamicun]

JJ and vortex,
yes, the 2 progs do the job.
so I do not need to use "GetWindowDC and   GetWindowExtex".

GetDesktopWindow is the choice. Easier than I thought.
Thank you both.
Clamicun