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I need to implement a c++ program to capture the power source change event time (AC from/to DC) and do some process when the process occurs. I have seen examples using Event Tracing for Windows (ETW). Is there any other mechanism available to capture windows events?

Arun
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Create a top-level window to receive WM_POWERBOADCAST messages, in which you can check for PBT_APMPOWERSTATUSCHANGE notifications:

Notifies applications of a change in the power status of the computer, such as a switch from battery power to A/C. The system also broadcasts this event when remaining battery power slips below the threshold specified by the user or if the battery power changes by a specified percentage.

Alternatively, you can use RegisterPowerSettingNotification() to receive WM_POWERBROADCAST messages containing PBT_POWERSETTINGCHANGE notifications for GUID_ACDC_POWER_SOURCE events:

The system power source has changed. The Data member is a DWORD with values from the SYSTEM_POWER_CONDITION enumeration that indicates the current power source.

Related: How to get the Windows Power State Message (WM_POWERBROADCAST) when not running a Win32 GUI app?

Remy Lebeau
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  • Thank you for the answer. How to capture some other events(wake from sleep, modern standby etc) – Arun Dec 14 '22 at 18:47
  • For wake from sleep, read the documentations I linked to. Also see [How can I know when Windows is going into/out of sleep or Hibernate mode?](https://stackoverflow.com/questions/228288/). Unfortunately, AFAIK, there is no (known) way to detect entering/leaving "modern standby" at this time. – Remy Lebeau Dec 14 '22 at 18:54