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PowerReadValueMax function (powrprof.h)

  • Article

Retrieves the maximum value for the specified power setting.

Syntax

DWORD PowerReadValueMax(
  [in, optional] HKEY       RootPowerKey,
  [in, optional] const GUID *SubGroupOfPowerSettingsGuid,
  [in, optional] const GUID *PowerSettingGuid,
  [out]          LPDWORD    ValueMaximum
);

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 that is being used.

[out] ValueMaximum

A pointer to a variable that receives the maximum for the specified power setting.

Return value

Returns ERROR_SUCCESS (zero) if the call was successful, and a nonzero value if the call failed.

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