Win32汇编居中窗体的可重用过程

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; 窗口居中过程，调用方法invoke _CenterWindow,hWinMain              Hankcs，2010
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_CenterWindow   proc    uses ebx hWnd
                LOCAL   @dwSnWidth,@dwSnHeight:dword
                LOCAL   @dwWndWidth,@dwWndHeight:dword
                LOCAL   @dwLeft,@dwTop:dword
                LOCAL   @stRect:RECT
                invoke GetSystemMetrics,SM_CXSCREEN
                mov     @dwSnWidth,eax
                invoke GetSystemMetrics,SM_CYSCREEN
                mov     @dwSnHeight,eax
                invoke GetWindowRect,hWnd,addr @stRect
                ;让窗体居中
                ;首先是X轴
                mov     eax,@stRect.right
                mov     @dwWndWidth,eax
                mov     eax,@stRect.left
                sub     @dwWndWidth,eax
               
   mov     eax,@stRect.bottom
                mov     @dwWndHeight,eax
                mov     eax,@stRect.top
                sub     @dwWndHeight,eax
               
                mov     eax,@dwWndWidth
                sub     @dwSnWidth,eax
                mov     edx,0
                mov     eax,@dwSnWidth
                mov     ecx,2
                div ecx
                mov @dwLeft,eax
               
                mov     eax,@dwWndHeight
                sub     @dwSnHeight,eax
                mov     edx,0
                mov     eax,@dwSnHeight
                mov     ecx,2
                div ecx
                mov @dwTop,eax
               
                invoke SetWindowPos,hWnd,HWND_NOTOPMOST,@dwLeft,@dwTop,0,0,SWP_NOSIZE
                               
                ret
_CenterWindow   endp

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