SetDevicePower

  • 项目

This function sets the device power state for a device.

DWORD SetDevicePower(
  PVOID pvDevice, 
  DWORD dwDeviceFlags,
  CEDEVICE_POWER_STATE DeviceState
);

Parameters

  • pvDevice
    [in] Specifies the device. Must be a valid LPWSTR device name, for example, "COM1:". This parameter is interpreted according to dwDeviceFlags.
  • dwDeviceFlags
    [in] Set to POWER_NAME to specify the name of the device that is requesting the power request.
  • DeviceState
    [in] Specifies the desired device power state.

Return Values

  • ERROR_SUCCESS
    Device found and device power state updated correctly.
  • ERROR_FILE_NOT_FOUND
    Device not found.
  • ERROR_WRITE_FAULT
    Attempt to update the device power failed.
  • ERROR_INVALID_PARAMETER
    Invalid device ID, flag, or dwState value.

Remarks

When SetDevicePower is called, qualify the name of your device with an associated class. For example, {8DD679CE-8AB4-43c8-A14A-EA4963FAA715}\DSK1: refers to a power-managed block device called DSK1. If no class qualification is present, the generic power-manageable class {A32942B7-920C-486b-B0E6-92A702A99B35} is assumed.

Applications should avoid using the API because it greatly restricts device power self-management. They should use the SetPowerRequirement call instead. Set the device power state to PwrDeviceUnspecified to allow normal power management to resume.

Requirements

OS Versions: Windows CE .NET 4.0 and later.
Header: Pm.h.
Link Library: Coredll.lib.

See Also

Power Management

 Last updated on Tuesday, May 18, 2004

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