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Index > Windows > Problem with dialog box size

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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Why the code below creates a dialog box which fills my whole 1024x768 screen? Which is the metric used on the width and the height of the dialog box?

Code:
include 'win32a.inc'

format PE GUI 4.0
entry start

  start:
        invoke  GetModuleHandle,0
        invoke  DialogBoxParam,eax,37,HWND_DESKTOP,DialogProc,0
        invoke  ExitProcess,0

proc DialogProc hwnddlg,msg,wparam,lparam
        push    ebx esi edi
        cmp     [msg],WM_CLOSE
        je      wmclose
        xor     eax, eax
        jmp     finish
  wmclose:
        invoke  EndDialog,[hwnddlg],0
  processed:
        mov     eax,1
  finish:
        pop     edi esi ebx
        ret
endp

section '.idata' import data readable writeable

  library kernel,'KERNEL32.DLL',\
          user,'USER32.DLL'

  import kernel,\
         GetModuleHandle,'GetModuleHandleA',\
         ExitProcess,'ExitProcess'

  import user,\
         DialogBoxParam,'DialogBoxParamA',\
         EndDialog,'EndDialog'

section '.rsrc' resource data readable

  directory RT_DIALOG,dialogs

  resource dialogs,\
           37,LANG_ENGLISH+SUBLANG_DEFAULT,demonstration

  dialog demonstration,'Create message box',0,0,679,457,WS_CAPTION+WS_SYSMENU

  enddialog    
Post 21 Nov 2006, 16:46
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7724
Location: Kraków, Poland
Tomasz Grysztar
WIN32.HLP wrote:
Every dialog box template contains measurements that specify the position, width, and height of the dialog box and the controls it contains. These measurements are device independent, so an application can use a single template to create the same dialog box for all types of display devices. This ensures that a dialog box will have the same proportions and appearance on all screens despite differing resolutions and aspect ratios between screens.

Dialog box measurements are given in dialog base units. One horizontal unit is equal to one-fourth of the average character width for the system font. One vertical unit is equal to one-eighth of the average character height for the system font. An application can retrieve the number of pixels per base unit for the current display by using the GetDialogBaseUnits function. An application can convert measurements from dialog base units to pixels by using the MapDialogRect function.
Post 21 Nov 2006, 17:14
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Thanks Embarassed
Post 21 Nov 2006, 18:04
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