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PowerReadPossibleValue function (powrprof.h)

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Retrieves the value for a possible value of a power setting.

Syntax

DWORD PowerReadPossibleValue(
  [in, optional]  HKEY       RootPowerKey,
  [in, optional]  const GUID *SubGroupOfPowerSettingsGuid,
  [in, optional]  const GUID *PowerSettingGuid,
  [out, optional] PULONG     Type,
  [in]            ULONG      PossibleSettingIndex,
  [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] 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.

[out, optional] Type

A pointer to a variable that receives the type of data for the value. The possible values are listed in Registry Value Types. This parameter can be NULL and the type of data is not returned.

[in] PossibleSettingIndex

The zero-based index of the possible setting.

[out, optional] Buffer

A pointer to a buffer that receives the value. If this parameter is NULL, the BufferSize parameter receives the required buffer size.

[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,

ERROR_MORE_DATA will be returned and the DWORD pointed to by the BufferSize parameter will be 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