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RequestPowerNotifications (Compact 2013)

  • Article

3/26/2014

This function enables applications and drivers to register for power notification events.

Syntax

HANDLE RequestPowerNotifications(
  HANDLE hMsgQ,
  DWORD Flags
);

Parameters

  • hMsgQ
    [in] Handle to the application message queue created with CreateMsgQueue. CreateMsgQueue requires a pointer to a MSGQUEUEOPTIONS structure. Set the cbMaxMessage parameter of the MSGQUEUEOTPIONS structure to sizeof(POWER_BROADCAST) + (MAX_PATH * sizeof TCHAR).

  • Flags
    [in] Set to the logical OR of the desired PBT_XXX notifications, or to POWER_NOTIFY_ALL to receive all notifications.

    The following table shows the notifications.

    Notification

    Description

    PBT_POWERINFOCHANGE

    Broadcast specifying that a battery power status field has changed. This notification has an associated POWER_BROADCAST_POWER_INFO structure.

    PBT_POWERSTATUSCHANGE

    Broadcast specifying that the power supply has switched either from AC to DC or from DC to AC.

    PBT_RESUME

    Broadcast notifying that the system is resuming and specifies the previous state.

    PBT_TRANSITION

    Broadcast specifying the system power state transition.

Return Value

Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.

Remarks

Power notification events are issued in a POWER_BROADCAST structure through message queues.

Requirements

Header

pm.h

Library

coredll.lib

See Also

Reference

Power Management Functions
POWER_BROADCAST
StopPowerNotifications

Other Resources

CreateMsgQueue