ASM Community

Hi,
Can somebody show me how to center a window onto the screen? I would like to know how to get the correct x and y if given the window height and width to place that window onto the center of the screen.
Thanks,
Barry

Taken from www.madwizard.org

CenterScreen proc hwnd:HWND 

LOCAL DlgHeight:DWORD 

LOCAL DlgWidth:DWORD 

LOCAL DlgRect:RECT 

LOCAL DesktopRect:RECT 

     

     invoke GetWindowRect,hwnd,ADDR DlgRect 

     invoke GetDesktopWindow 

     mov ecx,eax 

     invoke GetWindowRect,ecx,addr DesktopRect 

     push 0 

     mov eax,DlgRect.bottom 

     sub eax,DlgRect.top 

     mov DlgHeight,eax 

     push eax 

     mov eax,DlgRect.right 

     sub eax,DlgRect.left 

     mov DlgWidth,eax 

     push eax 

     mov eax,DesktopRect.bottom 

     sub eax,DlgHeight 

     shr eax,1 

     push eax 

     mov eax,DesktopRect.right 

     sub eax,DlgWidth 

     shr eax,1 

     push eax 

     push hwnd 

     call MoveWindow 

     ret 

CenterScreen endp 

My code

	invoke 	GetSystemMetrics, SM_CXSCREEN

	sub	eax,800

	shr	eax,1

	xchg 	eax,ebx

	invoke 	GetSystemMetrics, SM_CYSCREEN

	sub	eax,600

	shr	eax,1

	invoke 	CreateWindowEx, NULL,ADDR ClassName, ADDR AppName, WS_BORDER or WS_VISIBLE or WS_OVERLAPPEDWINDOW,\

				ebx,eax,800,600, 0, 0, hinst, 0

If you look in the MASM32 subfolders, your will discover many useful functions, the onr roticv posted, for example. :)