How do I know which monitor is connected to which graphics card? (c++ or c#)

Question

I can use Win32_DesktopMonitor to query all monitors, and use Win32_VideoController to query all graphics cards, but how do I know which monitor is connected to which graphics card?

Answer 1

How could I know that Dell is connected to Display1 and VE is connected to Display2?

If you only need to know this information, you can try the EnumDisplayMonitors function.

I've posted the answer on another thread of yours. Please check it at any time.

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Answer 2

Maybe you can use IDXGIAdapter
I have only 1 Monitor, so I cannot check if it works

I did this test on my OS =>

IDXGIFactory* pdxFactory;  
HRESULT hr = CreateDXGIFactory(IID_PPV_ARGS(&pdxFactory));  
if (SUCCEEDED(hr))  
{  
	int nAdapter = 0;  
	while (1)  
	{  
		IDXGIAdapter* pdxAdapter;  
		hr = pdxFactory->EnumAdapters(nAdapter, &pdxAdapter);  
		if (FAILED(hr))  
			break;  
		else  
		{  
			WCHAR wsText[255] = L"";  
			swprintf(wsText, L"Adapter n°%d\n", nAdapter);  
			OutputDebugString(wsText);				  
		}  
		DXGI_ADAPTER_DESC dxAdapterDesc;  
		hr = pdxAdapter->GetDesc(&dxAdapterDesc);  
		if (SUCCEEDED(hr))  
		{  
			WCHAR wsText[255] = L"";  
			swprintf(wsText, L"ID : %d - Description : %s\n", dxAdapterDesc.DeviceId, dxAdapterDesc.Description);  
			OutputDebugString(wsText);  
		}  
		int nOutput = 0;  
		while (1)  
		{  
			IDXGIOutput* pdxOutput;  
			if (FAILED(pdxAdapter->EnumOutputs(nOutput, &pdxOutput)))  
				break;  
			else  
			{  
				WCHAR wsText[255] = L"";  
				swprintf(wsText, L"\tOutput n°%d\n", nOutput);  
				OutputDebugString(wsText);  
			}  
			DXGI_OUTPUT_DESC dxOutputDesc;  
			hr = pdxOutput->GetDesc(&dxOutputDesc);  
			MONITORINFO mi = { sizeof(mi) };  
			GetMonitorInfo(dxOutputDesc.Monitor, &mi);  
			WCHAR wsText[255] = L"";  
			swprintf(wsText, L"\tDeviceName : %s - rc = {%d, %d, %d, %d}\n", dxOutputDesc.DeviceName, mi.rcMonitor.left, mi.rcMonitor.top, mi.rcMonitor.right, mi.rcMonitor.bottom);  
			OutputDebugString(wsText);  
			  
			pdxOutput->Release();  
			nOutput++;				  
		}  
		pdxAdapter->Release();  
		nAdapter++;  
	}		  
	pdxFactory->Release();  
}