WdfDeviceGetDevicePowerState function (wdfdevice.h)

Artikel
02/22/2024

[Applies to KMDF only]

Note

This function is for Microsoft internal use only.

The WdfDeviceGetDevicePowerState method returns the current state of the framework's power state machine, for a specified device.

Syntax

WDF_DEVICE_POWER_STATE WdfDeviceGetDevicePowerState(
  [in] WDFDEVICE Device
);

Parameters

[in] Device

A handle to a framework device object.

Return value

WdfDeviceGetDevicePowerState returns a WDF_DEVICE_POWER_STATE-typed enumerator that identifies the current state of the framework's power state machine for the specified device.

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

Remarks

For more information about the framework's state machines, see State Machines in the Framework.

The WdfDeviceGetDevicePowerState method returns a meaningful value only if it is called from within the following callback functions:

Examples

The following code example obtains the current state of the framework's power state machine for a specified device.

WDF_DEVICE_POWER_STATE state;

state = WdfDeviceGetDevicePowerState(Device);

Requirements

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

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