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COPP Video Miniport Driver Get Certificate Template Code

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This section applies only to Windows Server 2003 SP1 and later, and Windows XP SP2 and later.

Use the following example code to retrieve the size, in bytes, of the graphics hardware certificate for the COPP DirectX VA device object.

VP_STATUS
IoctlCOPPGetCertificateLength(
    PHW_DEVICE_EXTENSION pHwDeviceExtension,
    PVIDEO_REQUEST_PACKET pVideoRequestPacket
    )
{
    COPP_IO_InputBuffer* pInBuff = pVideoRequestPacket->InputBuffer;
    COPP_DeviceData* pThis = (COPP_DeviceData*)*pInBuff->ppThis;
    HRESULT* phr = pInBuff->phr;
     *phr = COPPGetCertificateLength(pThis, (ULONG*)pVideoRequestPacket->OutputBuffer);
    if (*phr == NO_ERROR) {
        pVideoRequestPacket->StatusBlock->Information = sizeof(ULONG);
    }
    return NO_ERROR;
}