WdfRequestWdmGetIrp function (wdfrequest.h)

[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

See also

WdfRequestGetParameters