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c++windowsservicestandby

Connected standby notification for a W8 Service

I have a service, developed in C++ running on Windows 8 (and 8.1). How can I get to know that the system has entered Connected Standby?

Since this is a service, it does not have a window, I should be using PowerRegisterSuspendResumeNotification, but it does not seem to be working. Does anyone know how I can get such a notification?

Solution

  • I have contacted Microsoft's technical support. This is their answer:

    There are no direct notifications for ConnectedStandby enter/exit, but you can just use the monitor on/off notifications since ConnectedStandby is synonymous with screen off on an AOAC capable system (but is not on a legacy system, AOAC capability can be had by getting SystemPowerCapabilities using CallNtPowerInformation and looking at the AoAc value of the SYSTEM_POWER_CAPABILITIES struct).

    To get monitor on/off notifications you can use RegisterPowerSettingNotification and use the GUID_MONITOR_POWER_ON power setting GUID.

    Looks like there is only a workaround for this by listening to screen on/off events.