WJ的Direct3D简明教程1：Save Screen To the Image

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   IDirect3DSurface9 *pBackBuffer;
   //  取得后缓存表面
   Device->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &pBackBuffer);
   //  将后缓存表面保存为文件（D3DXIFF_*为保存的图片格式，有BMP,JPG,TGA,PNG,DDS等）
   D3DXSaveSurfaceToFile("paper.jpg", D3DXIFF_JPG, pBackBuffer, NULL, NULL);
   pBackBuffer->Release();