How to call EnumAdapters from IDXGFactory in c?-CodePudding

How to call the EnumAdapters function in c from IDXGFactory

    UINT i = 0; 
    IDXGIFactory* pFactory = NULL;
    IDXGIAdapter * pAdapter; 
    HRESULT hr = CreateDXGIFactory(&IID_IDXGIFactory, (void**)(&pFactory) );

    if (hr != S_OK)
    {
        printf("Failed to create DXIFactory object\n");
    }

using pFactory->EnumAdapters(i, pAdapter) does not work and causes this error

struct "IDXGIFactory" has no field "EnumAdapters"

CodePudding user response：

You are interested in reading up on topic "using COM in plain C", where you can find relevant detailed explanations.

For you very specific question the code might look like:

#include <dxgi.h>

#pragma comment(lib, "dxgi.lib")
#pragma comment(lib, "dxguid.lib")

int main()
{
    IDXGIFactory* pFactory = NULL;
    UINT i = 0; 
    IDXGIAdapter* pAdapter; 
    HRESULT hr;
    hr = CreateDXGIFactory(&IID_IDXGIFactory, (void**)(&pFactory));
    hr = pFactory->lpVtbl->EnumAdapters(pFactory, i, &pAdapter);
    return 0;
}

Or, another way is to take advantage of COBJMACROS in which case you have IDXGIFactory_EnumAdapters available to you.

#define COBJMACROS

#include <dxgi.h>

#pragma comment(lib, "dxgi.lib")
#pragma comment(lib, "dxguid.lib")

int main()
{
    IDXGIFactory* pFactory = NULL;
    UINT i = 0; 
    IDXGIAdapter* pAdapter; 
    HRESULT hr;
    hr = CreateDXGIFactory(&IID_IDXGIFactory, (void**)(&pFactory));
    hr = IDXGIFactory_EnumAdapters(pFactory, i, &pAdapter);
    return 0;
}