>>99
んじゃ、GDIでやれ。

RECT ClientRect;
::GetClientRect(&ClientRect);
HDC WindowDC = ::GetDC(hwnd);
HDC MemDC = ::CreateCompatibleDC(hdc);
HBITMAP BackBuffer = ::CreateCompatibleBitmap(WindowDC, ClientRect.right, ClientRect.bottom);
HBITMAP OriginalBmp = static_cast<HBITMAP>(::SelectObject(MemDC, BackBuffer));

::DeleteObject(::SelectObject(MemDC, OriginalBmp));
::DeleteDC(MemDC);
::ReleaseDC(WindowDC);