CODEWITHSUNDEEP
c#.netwmiwmi-query
Werner
Werner

Reputation: 1311

Detect power state changes in modern standby

I need to detect power state changes in Modern Standby. In my specific use case, I'm trying to detect (and react) to S0 low-power (sleep) on a Microsoft Surface Pro.

So far, I have tried these methods from a plain Console Application (VS 2019):

SystemEvents.SessionSwitch.

SystemEvents.PowerModeChanged.

ManagementEventWatcher.

While I can get these to work well with my laptop, I cannot seem to capture the S0 low-power event, which the Surface Pro uses, with any of these classes.

If you follow the link for the ManagementEventWatcher, I have tried that exact code, but do not even get the "EventArrived" when invoking sleep on the Surface Pro.

Any thoughts and/or pointers?

EDIT: I guess somewhere in WMI it is possible to detect the S0 state. Perhaps some experts in WMI knows? E.g. what classname and scope to use with ManagementEventWatcher...

Upvotes: 3

Views: 868

Answers (1)

buffyanam
buffyanam

Reputation: 1

start from windows 8, there is a PowerRegisterSuspendResumeNotification() API, although it's c++, guess there should be some similar api in c#

Upvotes: -1

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