WdfDeviceConfigureRequestDispatching - NtDoc
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// wdfdevice.h
NTSTATUS WdfDeviceConfigureRequestDispatching(
[in] WDFDEVICE Device,
[in] WDFQUEUE Queue,
[in] WDF_REQUEST_TYPE RequestType
);
View the official Windows Driver Kit DDI referenceNo description available.
[Applies to KMDF and UMDF]
The WdfDeviceConfigureRequestDispatching method causes the framework to queue a specified type of I/O requests to a specified I/O queue.
Device [in]Supplies a handle to a framework device object.
Queue [in]Supplies a handle to a framework queue object.
RequestType [in]Supplies a WDF_REQUEST_TYPE-typed enumerator that identifies the type of request to be queued. The only valid enumerators are:
WdfRequestTypeCreate
WdfRequestTypeRead
WdfRequestTypeWrite
WdfRequestTypeDeviceControl
WdfRequestTypeDeviceControlInternal
If the operation succeeds, the method returns STATUS_SUCCESS. Additional return values include:
| Return code | Description |
|---|---|
| STATUS_INVALID_PARAMETER | An input parameter is invalid. |
| STATUS_INSUFFICIENT_RESOURCES | The amount of available memory is too low. |
| STATUS_WDF_BUSY | The driver has already assigned a queue to the specified request type. |
The method might return other NTSTATUS values.
A bug check occurs if the driver supplies an invalid object handle.
Each call to WdfDeviceConfigureRequestDispatching specifies one request type. If you want a single I/O queue to receive multiple types of requests (for example, read and write requests), your driver can call WdfDeviceConfigureRequestDispatching multiple times for a single I/O queue.
For more information about WdfDeviceConfigureRequestDispatching, see Creating I/O Queues and Managing I/O Queues.
The following code example initializes a WDF_IO_QUEUE_CONFIG structure, creates an I/O queue, and then configures the queue so that it receives write requests.
WDF_IO_QUEUE_CONFIG queueConfig;
WDFQUEUE WriteQueue;
WDF_IO_QUEUE_CONFIG_INIT(
&queueConfig,
WdfIoQueueDispatchSequential
);
queueConfig.EvtIoWrite = MyEvtIoWrite;
status = WdfIoQueueCreate(
Device,
&queueConfig,
WDF_NO_OBJECT_ATTRIBUTES,
&WriteQueue
);
if(!NT_SUCCESS(status)) {
return status;
}
status = WdfDeviceConfigureRequestDispatching(
Device,
WriteQueue,
WdfRequestTypeWrite
);
if(!NT_SUCCESS(status)) {
return status;
}