The ProtocolDirectOidRequestComplete function completes the processing of a protocol driver-initiated direct OID request for which the NdisDirectOidRequest function returned NDIS_STATUS_PENDING.

Note  You must declare the function by using the PROTOCOL_DIRECT_OID_REQUEST_COMPLETE type. For more information, see the following Examples section.



void ProtocolDirectOidRequestComplete(
  NDIS_HANDLE ProtocolBindingContext,



A handle to a protocol driver-allocated context area in which the protocol driver maintains per-binding run-time state. The driver supplied this handle when it called the NdisOpenAdapterEx function.


A pointer to the protocol driver-supplied NDIS_OID_REQUEST structure that was previously passed to the NdisDirectOidRequest function.


The final status of the request. The underlying driver or NDIS determines this final status. This parameter determines what ProtocolDirectOidRequestComplete does with the information at OidRequest.

Return Value



ProtocolDirectOidRequestComplete is an optional function. If a protocol driver does not use direct OID requests, it can set the entry point for this function to NULL when it calls the NdisRegisterProtocolDriver function.

ProtocolDirectOidRequestComplete uses the input value of the Status parameter as follows:

  • If Status is NDIS_STATUS_SUCCESS, the BytesRead or BytesWritten member of the NDIS_OID_REQUEST structure has been set by NDIS or the underlying driver. These values specify how much protocol driver-supplied information was transferred from the buffer at InformationBuffer to the NIC in a set operation or how much information was returned at InformationBuffer in response to a query operation.

    If the protocol driver made a query, ProtocolDirectOidRequestComplete can use the data that is returned at InformationBuffer in any way that the protocol driver determines, depending on the value of the Oid member.

    For example, if the protocol driver originally initiated an OID_GEN_MAXIMUM_SEND_PACKETS query, ProtocolDirectOidRequestComplete might set up state variables in the ProtocolBindingContext area to throttle the number of outstanding sends that the driver will set up for subsequent calls to the NdisSendNetBufferLists function.

  • If Status is NDIS_STATUS_INVALID_LENGTH or NDIS_STATUS_BUFFER_TOO_SHORT, the BytesNeeded member specifies the OID-specific value of the InformationBufferLength member that is required to carry out the requested operation.

    In these circumstances, ProtocolDirectOidRequestComplete can allocate sufficient buffer space for the request, set up another NDIS_OID_REQUEST structure with the required InformationBufferLength value and same Oid value, and retry the call to the NdisDirectOidRequest function.

    ProtocolDirectOidRequestComplete can retry requests for certain other NDIS_STATUS_ Xxx arguments, as well, as described in NdisDirectOidRequest.

  • If Status is an NDIS_STATUS_ Xxx value that is an unrecoverable error, ProtocolDirectOidRequestComplete should release the memory that is allocated for the NDIS_OID_REQUEST structure and determine whether the driver should close the binding or adjust its binding-specific state information to handle continued network I/O operations on the binding.
ProtocolDirectOidRequestComplete can be called before the protocol driver has had time to inspect the status code that NdisDirectOidRequest returns at Status.

NDIS calls ProtocolDirectOidRequestComplete at IRQL <= DISPATCH_LEVEL.


To define a ProtocolDirectOidRequestComplete function, you must first provide a function declaration that identifies the type of function you're defining. Windows provides a set of function types for drivers. Declaring a function using the function types helps Code Analysis for Drivers, Static Driver Verifier (SDV), and other verification tools find errors, and it's a requirement for writing drivers for the Windows operating system.

For example, to define a ProtocolDirectOidRequestComplete function that is named "MyDirectOidRequestComplete", use the PROTOCOL_DIRECT_OID_REQUEST_COMPLETE type as shown in this code example:

Then, implement your function as follows:
    NDIS_HANDLE  ProtocolBindingContext,
    PNDIS_OID_REQUEST  OidRequest,
    NDIS_STATUS  Status
The PROTOCOL_DIRECT_OID_REQUEST_COMPLETE function type is defined in the Ndis.h header file. To more accurately identify errors when you run the code analysis tools, be sure to add the _Use_decl_annotations_ annotation to your function definition. The _Use_decl_annotations_ annotation ensures that the annotations that are applied to the PROTOCOL_DIRECT_OID_REQUEST_COMPLETE function type in the header file are used. For more information about the requirements for function declarations, see Declaring Functions by Using Function Role Types for NDIS Drivers.

For information about Use_decl_annotations, see Annotating Function Behavior.


Minimum supported client Supported in NDIS 6.1 and later.
Target Platform Windows
Header ndis.h (include Ndis.h)

See Also