case WM_CTLCOLORDLG:
    GetClientRect(hDlg, &rcDialog);
    //通过SetStretchBltMode的设置能使StretchBlt在缩放图像更加清晰
    SetStretchBltMode((HDC)wParam, COLORONCOLOR);
    StretchBlt((HDC)wParam, 0, 0, rcDialog.right, rcDialog.bottom, s_hdcMem, 0, 0, s_bm.bmWidth, s_bm.bmHeight, SRCCOPY);  
    return (BOOL)((HBRUSH)GetStockObject(NULL_BRUSH));

return (BOOL)((HBRUSH)GetStockObject(NULL_BRUSH))

WM_CTLCOLORDLG message
Sent to a dialog box before the system draws the dialog box. By responding to this message, the dialog box can set its text and background colors using the specified display device context handle.

C++Copy

#define WM_CTLCOLORDLG 0x0136

Parameters
wParam
A handle to the device context for the dialog box.

lParam
A handle to the dialog box.

Return value
If an application processes this message, it must return a handle to a brush. The system uses the brush to paint the background of the dialog box.

 .elseif eax==WM_CTLCOLORDLG
    invoke  RtlZeroMemory,addr rect,sizeof rect
    invoke GetClientRect,hWin,addr rect
    invoke SetStretchBltMode,wParam,COLORONCOLOR
    invoke StretchBlt,wParam,0,0,rect.right,rect.bottom,hdcSrc,0,0,sbmp.bmWidth,sbmp.bmHeight,SRCCOPY
    invoke GetStockObject,NULL_BRUSH

DlgProc	proc	hWin:HWND,uMsg:UINT,wParam:WPARAM,lParam:LPARAM
	mov	eax,uMsg
	.if	eax==WM_INITDIALOG
		;initialization here
	.elseif	eax==WM_COMMAND
		mov edx,wParam
		movzx eax,dx
		shr edx,16
		.if edx==BN_CLICKED
			.if eax==IDOK

			.elseif eax==IDCANCEL
				invoke	SendMessage,hWin,WM_CLOSE,NULL,NULL
			.endif
		.endif
	.elseif	eax==WM_CLOSE
		invoke	EndDialog,hWin,0
	.else
		mov	eax,FALSE
		ret
	.endif
	mov	eax,TRUE ;注意此行已经设置了默认所有消息返回值为真
	ret
DlgProc endp

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