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Question about HDC to SURFACE

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I want to get a window image as texture using PrintWindow.
I don't know what's wrong with my code...
This is my code:
	RECT rect;
	GetWindowRect(mhMainWnd, &rect);
	HDC hScrDC = GetDC(mhMainWnd);
	HDC hMemDC = CreateCompatibleDC(hScrDC);
	PrintWindow(mhMainWnd, hMemDC, 0);
	mTestTex->GetSurfaceLevel(0, &surf);
	DeleteDC(hMemDC) ;
	ReleaseDC(NULL, hScrDC);
Any help would be appriciated!
Thanks! Edited by kgs

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