How to use DirectX11 with D3DImage

[ThusMad]

Hi @smourier 👋 I'm using this sample to create my own control that I'll be using to draw some 2d stuff. Since the SharpDX is not supported for .Net 5.0+, I've rewritten the code in sample with DirectN. The code I ended with here but I faced a error

System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

What I'm missing? In what direction should I look? Maybe there is a good sample?

[smourier]

Hi,

Do you have a full reproducing sample (all files, project file, etc.) so it's easier for me to take a look?

[ThusMad]

Yes, here is a small project containing my code https://github.com/ThusMad/D3DDx11

[smourier]

This is not related to DirectN, the problem comes from how you use DirectX9's CreateTextureAPI.

As you can see from the doc here: https://learn.microsoft.com/en-us/windows/win32/api/d3d9helper/nf-d3d9helper-idirect3ddevice9-createtexture, this is the method's layout:

HRESULT CreateTexture(
  [in]          UINT              Width,
  [in]          UINT              Height,
  [in]          UINT              Levels,
  [in]          DWORD             Usage,
  [in]          D3DFORMAT         Format,
  [in]          D3DPOOL           Pool,
  [out, retval] IDirect3DTexture9 **ppTexture,
  [in]          HANDLE            *pSharedHandle
);

so, pSharedHandleis a pointer to a HANDLE, not a HANDLE.

To fix it you must allocate some memory and write the shared handle to it, or use DirectN's ComMemorytool which will handle that for you:

using var handlePtr = new ComMemory(handle);
var hr = _d3DDevice.Object.CreateTexture(description.Width, description.Height, 1, Constants.D3DUSAGE_RENDERTARGET,
    format, _D3DPOOL.D3DPOOL_DEFAULT, out var texture, handlePtr.Pointer);

[ThusMad]

Oh, i see, now it works, thx a lot.