Re: Get the system uptime?

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#16228

From: Hans Galema
Date: Wed, 28 May 2003 07:57

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vERUs wrote:
> Hi, I wonder how I can obtain the system uptime?
> Can this be made using "NtQuerySystemInformation"?

Don't know.

> It's for a monitoring
> tool that expects to be running for long periods of time so I can't use
> TickCount() because of it's ~47 days limit.

GetTickCount () ?

Why not ? One can monitor a system without knowing the time.

You could determine the date-time at startup and compare that
with the actual date-time. Just substract two values.
(Only if the tool starts at boot)

Also you can keep track of GetTickCount() passing the maximum
value and starting with zero again. (Also assuming your tool
runs as long as the OS runs).

__int64 GetTotalTickCount ( void )
{
    static __int64 former_tickcount = 0;

    static unsigned int lasttickcount = 0;

    unsigned int tickcount = GetTickCount();

    if ( tickcount < lasttickcount )
       former_tickcount += 0xFFFFFFFF;

    lasttickcount = tickcount;

    return former_tickcount + tickcount;
}

Hans.

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Date: Wed, 28 May 2003 09:57:54 +0200
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