WdfRequestWdmGetIrp function (wdfrequest.h)

Artikel
02/22/2024

[Applies to KMDF only]

The WdfRequestWdmGetIrp method returns the WDM IRP structure that is associated with a specified framework request object.

Syntax

PIRP WdfRequestWdmGetIrp(
  [in] WDFREQUEST Request
);

Parameters

[in] Request

A handle to a framework request object.

Return value

WdfRequestWdmGetIrp returns a pointer to an IRP structure.

A bug check occurs if the driver supplies an invalid object handle.

Remarks

The driver must not access a request's IRP structure after completing the I/O request.

For more information about WdfRequestWdmGetIrp, see Obtaining Information About an I/O Request.

Examples

The following code example is part of an EvtIoDeviceControl callback function that obtains the WDM IRP that is associated with an I/O request and then calls IoGetNextIrpStackLocation to obtain the next-lower driver's I/O stack location.

VOID
MyEvtIoDeviceControl(
    IN WDFQUEUE  Queue,
    IN WDFREQUEST  Request,
    IN size_t  OutputBufferLength,
    IN size_t  InputBufferLength,
    IN ULONG  IoControlCode
    )
{
    PIRP  irp = NULL;
    PIO_STACK_LOCATION  nextStack;
...
    irp = WdfRequestWdmGetIrp(Request);
    nextStack = IoGetNextIrpStackLocation(irp);
...
}

Requirements

Requirement	Value
Target Platform	Universal
Minimum KMDF version	1.0
Header	wdfrequest.h (include Wdf.h)
Library	Wdf01000.sys (see Framework Library Versioning.)
IRQL	<=DISPATCH_LEVEL
DDI compliance rules	DriverCreate(kmdf), InvalidReqAccess(kmdf), InvalidReqAccessLocal(kmdf), KmdfIrql(kmdf), KmdfIrql2(kmdf), KmdfIrqlExplicit(kmdf)

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