D3DKMTOpenAdapterFromHdc function (d3dkmthk.h)

Article
02/22/2024

The D3DKMTOpenAdapterFromHdc function maps a device context handle (HDC) to a graphics adapter handle and, if the adapter contains multiple monitor outputs, to one of those outputs.

Syntax

NTSTATUS D3DKMTOpenAdapterFromHdc(
  D3DKMT_OPENADAPTERFROMHDC *unnamedParam1
);

Parameters

unnamedParam1

pData [in, out]

A pointer to a D3DKMT_OPENADAPTERFROMHDC structure that describes the parameters that are required to perform the mapping.

Return value

D3DKMTOpenAdapterFromHdc returns one of the following values:

Return code	Description
STATUS_SUCCESS	The mapping was performed successfully.
STATUS_NO_MEMORY	The kernel ran out of the resources that would enable it to open another handle.
STATUS_INVALID_PARAMETER	Parameters were validated and determined to be incorrect or the Windows Vista display driver model was not used.

This function might also return other NTSTATUS values.

Remarks

A graphics adapter corresponds to a video card. A monitor output corresponds to a head on a video card. A system with a single video card contains only one adapter. However, if the video card supports multiple heads, it supports outputting to multiple monitors. Use the D3DKMTCloseAdapter function to avoid resource leaks.

Examples

The following code example demonstrates how an OpenGL ICD can use D3DKMTOpenAdapterFromHdc to retrieve the graphics adapter handle and the output for the primary monitor from the HDC.

HRESULT GetPrimaryAdapterHandle(HANDLE* phAdapter, UINT* pOutput)
{
    D3DKMT_OPENADAPTERFROMHDC OpenAdapterData;
    DISPLAY_DEVICE dd;
    HDC hdc;
    int i;

    *phAdapter = NULL;
    *pOutput = 0;
    memset(&dd, 0, sizeof (dd));
    dd.cb = sizeof dd;

    for (i = 0; EnumDisplayDevicesA(NULL, i, &dd, 0); ++i) {
        if (dd.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE) {
            break;
        }
    }

    hdc = CreateDC (NULL, dd.DeviceName, NULL, NULL);
    if (hdc == NULL) {
        return E_FAIL;
    }

    OpenAdapterData.hDc = hdc;
    if (NT_SUCCESS((*pfnKTOpenAdapterFromHdc)(&OpenAdapterData))) {
        DeleteDC(hdc);
        *phAdapter = OpenAdapterData.hAdapter;
        *pOutput = OpenAdapterData.VidPnSourceId;
        return S_OK;
    }
    DeleteDC(hdc);

    return E_FAIL;
}

Requirements

Requirement	Value
Minimum supported client	Windows Vista
Target Platform	Universal
Header	d3dkmthk.h (include D3dkmthk.h)
Library	Gdi32.lib
DLL	Gdi32.dll

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