内核怎么获取网卡MAC

以下代码获取都是空的。
PINTERNAL_REQUEST pNdisRequest = ExAllocatePool(NonPagedPool, sizeof(INTERNAL_REQUEST));
        if (NULL == pNdisRequest)
                return STATUS_UNSUCCESSFUL;

        RtlZeroMemory(&pNdisRequest->Request, sizeof(NDIS_REQUEST));

        pNdisRequest->Request.RequestType = NdisRequestQueryInformation;
        pNdisRequest->Request.DATA.QUERY_INFORMATION.Oid = OID_802_3_PERMANENT_ADDRESS;
        pNdisRequest->Request.DATA.QUERY_INFORMATION.InformationBuffer = buf;
        pNdisRequest->Request.DATA.QUERY_INFORMATION.InformationBufferLength = 256;
        NdisRequest(&status, open->AdapterHandle, &pNdisRequest->Request);
        if (status == NDIS_STATUS_PENDING) {
                NdisWaitEvent(&open->Event, 0);
                _asm int 3
                status = NDIS_STATUS_SUCCESS;
        }

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