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Editorial Team
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Asked: 2026-05-28T04:27:30+00:00

I’m working with a C project that’s using DirectX and I’ve run into a

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I’m working with a C project that’s using DirectX and I’ve run into a problem. Certain DX calls require a IID object, typically generated with __uuidof. One thing this is required for is creating a RenderTargetView. The DirectX samples/tutorials do this:

ID3D11Texture2D* pBackBuffer = NULL;
hr = g_pSwapChain->GetBuffer( 0, __uuidof( ID3D11Texture2D ), ( LPVOID* )&pBackBuffer );

When I try to call __uuidof in my C code, I get an compiler error: Error 19 error C4233: nonstandard extension used : '__uuidof' keyword only supported in C++, not C. DirectX has a C interface, so I imagine there must be a way to do this, but I have no idea what it would be. Anyone know?

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1 Answer

  1. Editorial Team

    __uuidof is only available in C++, as error described. I think you already have definitions of the GUIDs of the interfaces for C available in DX header files.

    http://social.msdn.microsoft.com/Forums/en-US/vclanguage/thread/1306b57f-4b75-4f0c-b4f3-9bcc1e3a0dd6

    From d3d11.h:

    EXTERN_C const IID IID_ID3D11Texture2D;

    Use this instead of __uuidof(ID3D11Texture2D).

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