Edit

SYSTEM_POWER_STATUS structure (winbase.h)

  • Article

Contains information about the power status of the system.

Syntax

typedef struct _SYSTEM_POWER_STATUS {
  BYTE  ACLineStatus;
  BYTE  BatteryFlag;
  BYTE  BatteryLifePercent;
  BYTE  SystemStatusFlag;
  DWORD BatteryLifeTime;
  DWORD BatteryFullLifeTime;
} SYSTEM_POWER_STATUS, *LPSYSTEM_POWER_STATUS;

Members

ACLineStatus

The AC power status. This member can be one of the following values.

Value Meaning
0
 Offline
1
 Online
255
 Unknown status

BatteryFlag

The battery charge status. This member can contain one or more of the following flags.

Value Meaning
1
 High—the battery capacity is at more than 66 percent
2
 Low—the battery capacity is at less than 33 percent
4
 Critical—the battery capacity is at less than five percent
8
 Charging
128
 No system battery
255
 Unknown status—unable to read the battery flag information
 

The value is zero if the battery is not being charged and the battery capacity is between low and high.

BatteryLifePercent

The percentage of full battery charge remaining. This member can be a value in the range 0 to 100, or 255 if status is unknown.

SystemStatusFlag

The status of battery saver. To participate in energy conservation, avoid resource intensive tasks when battery saver is on. To be notified when this value changes, call the RegisterPowerSettingNotification function with the power setting GUID, GUID_POWER_SAVING_STATUS.

Value Meaning
0
 Battery saver is off.
1
 Battery saver on. Save energy where possible.
 
Note  This flag and the GUID_POWER_SAVING_STATUS GUID were introduced in Windows 10. This flag was previously reserved, named Reserved1, and had a value of 0.
 
For general information about battery saver, see battery saver (in the hardware component guidelines).

BatteryLifeTime

The number of seconds of battery life remaining, or –1 if remaining seconds are unknown or if the device is connected to AC power.

BatteryFullLifeTime

The number of seconds of battery life when at full charge, or –1 if full battery lifetime is unknown or if the device is connected to AC power.

Remarks

The system is only capable of estimating BatteryFullLifeTime based on calculations on BatteryLifeTime and BatteryLifePercent. Without smart battery subsystems, this value may not be accurate enough to be useful.

Requirements

Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Header winbase.h (include Windows.h)

See also

GetSystemPowerStatus

PBT_APMPOWERSTATUSCHANGE

battery saver (in the hardware component guidelines)