PowerReadDescription function (powrprof.h)

Retrieves the description for the specified power setting, subgroup, or scheme. If the SchemeGuid parameter is not NULL but both the SubGroupOfPowerSettingsGuid and PowerSettingGuid parameters are NULL, the description of the power scheme will be returned. If the SchemeGuid and SubGroupOfPowerSettingsGuid parameters are not NULL and the PowerSettingGuid parameter is NULL, the description of the subgroup will be returned. If the SchemeGuid, SubGroupOfPowerSettingsGuid, and PowerSettingGuid parameters are not NULL, the description of the power setting will be returned.

Syntax

DWORD PowerReadDescription(
  [in, optional]  HKEY       RootPowerKey,
  [in, optional]  const GUID *SchemeGuid,
  [in, optional]  const GUID *SubGroupOfPowerSettingsGuid,
  [in, optional]  const GUID *PowerSettingGuid,
  [out, optional] PUCHAR     Buffer,
  [in, out]       LPDWORD    BufferSize
);

Parameters

[in, optional] RootPowerKey

This parameter is reserved for future use and must be set to NULL.

[in, optional] SchemeGuid

The identifier of the power scheme.

[in, optional] SubGroupOfPowerSettingsGuid

The subgroup of power settings. This parameter can be one of the following values defined in WinNT.h. Use NO_SUBGROUP_GUID to refer to the default power scheme.

Value	Meaning
NO_SUBGROUP_GUID fea3413e-7e05-4911-9a71-700331f1c294	Settings in this subgroup are part of the default power scheme.
GUID_DISK_SUBGROUP 0012ee47-9041-4b5d-9b77-535fba8b1442	Settings in this subgroup control power management configuration of the system's hard disk drives.
GUID_SYSTEM_BUTTON_SUBGROUP 4f971e89-eebd-4455-a8de-9e59040e7347	Settings in this subgroup control configuration of the system power buttons.
GUID_PROCESSOR_SETTINGS_SUBGROUP 54533251-82be-4824-96c1-47b60b740d00	Settings in this subgroup control configuration of processor power management features.
GUID_VIDEO_SUBGROUP 7516b95f-f776-4464-8c53-06167f40cc99	Settings in this subgroup control configuration of the video power management features.
GUID_BATTERY_SUBGROUP e73a048d-bf27-4f12-9731-8b2076e8891f	Settings in this subgroup control battery alarm trip points and actions.
GUID_SLEEP_SUBGROUP 238C9FA8-0AAD-41ED-83F4-97BE242C8F20	Settings in this subgroup control system sleep settings.
GUID_PCIEXPRESS_SETTINGS_SUBGROUP 501a4d13-42af-4429-9fd1-a8218c268e20	Settings in this subgroup control PCI Express settings.

[in, optional] PowerSettingGuid

The identifier of the power setting that is being used.

[out, optional] Buffer

A pointer to a buffer that receives the description. If this parameter is NULL, the BufferSize parameter receives the required buffer size. The strings returned are all wide (Unicode) strings.

[in, out] BufferSize

A pointer to a variable that contains the size of the buffer pointed to by the Buffer parameter.

If the Buffer parameter is NULL, the function returns ERROR_SUCCESS and the variable receives the required buffer size.

If the specified buffer size is not large enough to hold the requested data, the function returns ERROR_MORE_DATA and the variable receives the required buffer size.

Return value

Returns ERROR_SUCCESS (zero) if the call was successful, and a nonzero value if the call failed. If the buffer size specified by the BufferSize parameter is too small, the function returns ERROR_SUCCESS and the DWORD pointed to by the BufferSize parameter is filled in with the required buffer size.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Target Platform	Windows
Header	powrprof.h
Library	PowrProf.lib
DLL	PowrProf.dll

See also

Power Management Functions