k3xji wrote:
I think what I am looking for is SetConsoleCtrlHandler(..) which receives signals for CTRL+C and system shutdown. I don't want to take the power outage into account because as far as I can see there is no portable/simple/reliable way to accomplish that. So, thanks for the tip again.
If your hardware is connected to a UPS (uninterruptable power supply aka battery backup) that signals the OS when power has gone and it has switched to the battery, you should be able to respond to that also.
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