WdfRequestSetInformation function (wdfrequest.h)

[Applies to KMDF and UMDF]

The WdfRequestSetInformation method sets completion status information for a specified I/O request.

Syntax

VOID WdfRequestSetInformation(
 [in] WDFREQUEST Request,
 [in] ULONG_PTR Information
);

Parameters

[in] Request

A handle to a framework request object.

[in] Information

Driver-defined completion status information for the request.

Return value

None

Remarks

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

Framework-based drivers use the WdfRequestSetInformation method to supply driver-specific information that is associated with the completion of an I/O request, such as the number of bytes transferred. Other drivers can obtain this information by calling WdfRequestGetInformation.

Drivers can also specify completion status information by calling WdfRequestCompleteWithInformation.

For more information about WdfRequestSetInformation, see Completing I/O Requests.

Examples

The following code example sets request completion information that is based on the value of the I/O control code that an EvtIoDeviceControl callback function receives.

VOID
MyEvtIoDeviceControl(
 IN WDFQUEUE Queue,
 IN WDFREQUEST Request,
 IN size_t OutputBufferLength,
 IN size_t InputBufferLength,
 IN ULONG IoControlCode
 )
{
 switch (IoControlCode) {
 case MY_IOCTL_CODE_1:
 WdfRequestSetInformation(
 Request,
 VALUE_1
 );
 status = STATUS_SUCCESS; 
 break;

 case MY_IOCTL_CODE_2:
 WdfRequestSetInformation(
 Request,
 VALUE_2
 );
 status = STATUS_SUCCESS; 
 break;

 case MY_IOCTL_CODE_3:
 WdfRequestSetInformation(
 Request,
 VALUE_3
 );
 status = STATUS_SUCCESS;
 break;

 default:
 status = STATUS_INVALID_DEVICE_REQUEST;
 break;
 }

 WdfRequestComplete(
 Request,
 status
 );
}

Requirements

See also

WdfRequestCompleteWithInformation

WdfRequestGetInformation