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Hello. I'm just creating a program that's supposed to count how long the computer is on. I have already created a counting of time, but there was a problem if you can save Label's content automatically when you shut down your computer (I mean that the program would save Label's value alone, without user intervention). I would be grateful for help.

What I have tried:

I am asking for help, because I have no idea how to do it.

Posted 2-May-19 1:00am

Member 14352515

Updated 2-May-19 1:25am

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OriginalGriff · Accepted Answer · 2019-05-02T01:26:00

Instead of counting, use GetTickCount64 function (sysinfoapi.h) | Microsoft Docs[^] - it returns the milliseconds since Windows was started. It's a lot more accurate, since timers in Windows only fire "after a time period", not "on a time period". If you use timers to count seconds for example, they will drift quite significantly when the system is busy.

Remember that while WM_QUERYENDSESSION will tell you windows is about to close, it won't have any effect if the power cord is pulled out!

Richard MacCutchan · Accepted Answer · 2019-05-02T01:07:00

Solution 1

See WM_QUERYENDSESSION message - Windows applications | Microsoft Docs[^].

Posted 2-May-19 1:07am

Richard MacCutchan

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Member 14352515 2-May-19 7:36am

Thank you very much for your answer.