NDIS calls a filter driver's FilterCancelDirectOidRequest function to cancel a direct OID request.

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



void FilterCancelDirectOidRequest(
  NDIS_HANDLE FilterModuleContext,
  PVOID RequestId



A handle to the context area for the filter module that is the target of this request. The filter driver created and initialized this context area in the FilterAttach function.


A cancellation identifier for the request. This identifier specifies the direct OID requests that match this value in the RequestId member of the NDIS_OID_REQUEST structure.

Return Value



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

When NDIS calls FilterCancelDirectOidRequest, the filter driver should attempt to call NdisFDirectOidRequestComplete function as soon as possible.

If a filter driver does not queue direct OID requests, the driver is not required to provide a FilterCancelDirectOidRequest function. If the filter driver does not specify a FilterCancelDirectOidRequest entry point, NDIS calls the cancel OID request function of the underlying driver.

NDIS calls the FilterCancelDirectOidRequest function when the originator of the request cancels therequest.

If the request processing is still not complete in a filter driver, the driver calls the NdisFDirectOidRequestComplete function with the status set to NDIS_STATUS_REQUEST_ABORTED.

If the filter driver forwarded the request to an underlying driver and the processing is still not complete, the filter driver calls the NdisFCancelDirectOidRequest function with the OidRequest parameter set to the value that it sent to the underlying driver.

NDIS calls FilterCancelDirectOidRequest at IRQL <= DISPATCH_LEVEL.


To define a FilterCancelDirectOidRequest 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 FilterCancelDirectOidRequest function that is named "MyCancelDirectOidRequest", use the FILTER_CANCEL_DIRECT_OID_REQUEST type as shown in this code example:

Then, implement your function as follows:
    NDIS_HANDLE  FilterModuleContext,
    PVOID  RequestId
The FILTER_CANCEL_DIRECT_OID_REQUEST 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 FILTER_CANCEL_DIRECT_OID_REQUEST 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