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LockRect doesnt seem to be working (code included)

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Hi, just trying to lock a rectangle so i can access the pixels within the area i have designated and it wont work. Simply the return structure from the LockRect function is always NULL,
	l_pD3DDevice->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO, &surf);

	// define the rectangle to lock
	D3DLOCKED_RECT pLockedRect;
	RECT rect;
	rect.bottom = 100;
	rect.left = 50;
	rect.right = 100;
	rect.top = 50;

	surf->LockRect(&pLockedRect, &rect, NULL);

pLockedRect is always NULL, i have also tried various flags and nothing changes any ideas? ace

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