How to convert Microsoft::WRL::ComPtr<ID3D11Device> into ID3D11Device* ? (C++/CX app win 8 )

Question

How to convert Microsoft::WRL::ComPtr<ID3D11Device> into ID3D11Device*  ? (C++/CX app win 8 )
Because I want to save DirectX image by

CaptureTexture( ID3D11Device* pDevice, ID3D11DeviceContext* pContext, ID3D11Resource* pSource, ScratchImage& result ).

http://directxtex.codeplex.com/wikipage?title=Direct3D%2011%20Helper%20Functions&referringTitle=DirectXTex

Below my variables :
  Microsoft::WRL::ComPtr<ID3D11Device>    m_d3dDevice;
  Microsoft::WRL::ComPtr<ID3D11DeviceContext>   m_d3dContext;
  Microsoft::WRL::ComPtr<ID3D11Texture2D>    depthStencil;  

Answer 1

Anytime you need a 'raw' pointer from a ComPtr, just use .Get()

ScratchImage img;
hr= CaptureTexture( m_d3dDevice.Get(), m_d3dContext.Get(), depthStencil.Get(), img);

Two comments:

* Using DirectXTex for just capturing a screenshot or dumping a texture to disk is overkill. That's exactly what the ScreenShot module is designed to do very efficiently. See <http://blogs.msdn.com/b/chuckw/archive/2012/05/04/direct3d-11-textures-and-block-compression.aspx>

* It's a little odd to be dumping a 'depth stencil buffer' and the resulting DDS file is unlikely to be viewable by most DDS file viewers.

Answer 2

Thanks you help.

Answer 3

But My DirectX is in XAML. like below

I builded it by SurfaceImageSource.
So, I can also use the screenshot?

Answer 4

"ScreenShot" is just a light-weight version of "CaptureTexture + Save*ToFile" combined.

Answer 5

You say right. To input depthStencil pointer is  odd. I had altered. thank you!

Answer 6

Hi,I have a new problem.

I had gotten a ScratchImage img.

But I want to crop it. How to do it? 

Answer 7

You would create a new ScratchImage of the target size, then DirectXTex's CopyRectangle to copy cropped image data from your img to the new one.

For DirectXTex library specific questions, you should go to the CodePlex site.

Answer 8

Thank you! Next,I will post the problem in there.