Re: WM_TIMER

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#1762

From: Ed Mulroy
Date: Thu, 14 Jun 2007 21:45

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I did not know that.  Thanks, that's good information!

.  Ed

> Eliot Frank wrote in message
> news:46716e05@newsgroups.borland.com...
>>
>> WM_TIMER messages typically come in at multiples of 55
> milliseconds and
>
> Different versions of Windows may use different timing.  Maybe Windows 
> 95/98 used the original PC default timing of 18.2 Hz. On my Windows XP 
> desktop direct measurement using GetTickCount() shows an interval of 15 or 
> 16 milliseconds with an average of 15.625ms corresponding to 64Hz. This 
> correlates with measurements using GetTickCount() on the same machine:
>
> Timer::Interval Measured interval Fractional seconds
> 200 203 or 204 13/64
> 210 218 or 219 14/64
> 220 234 or 235 15/64
> 230 234 or 235 15/64
> 240 250 16/64
> 250 250 16/64
>
> The GetSystemTimeAdjustment function also gives the time period between 
> the system's clock interrupts which on my system is again 15625.0 
> microseconds (64 Hz).

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Subject: Re: WM_TIMER
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