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03.05.2008 at 04:16AM PST, ID: 23215642
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9.1

Timer not accurate when window not in focus

Asked by akb in Windows Programming, Delphi Programming

Tags: , , ,

I have an application which toggles the scroll lock on the keyboard to sound a countdown siren for a sporting event.  I have the siren hooked up to the scroll lock LED.  As the time approaches the minute, I sound the siren for 200ms each second, then for 1000ms on the minute.  I switch on the LED, then use a timer to time the 200ms or 1000ms.  When the OnTimer procedure is called, the LED (and thus the siren)
is switched off.  When the program window has focus, this works perfectly.  When it does not have focus, the timer is inaccurate and the LED stays on for a second or more.
Is there any way I can make the timer more accurate when the window does not have focus?
I have tried setting the priority of the task in Task Manager to Real Time and High, but this makes no difference.
I have tried running this application on a very fast processor and it still does not work.
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Keywords: Timer not accurate when window not i…
Title
1 Countdown Timer
2 Icon as LED with timer !!!
3 Countdown timer shown on Form in Ac…
4 LED COUNTDOWN TIMER NOT WORKING
5 C++ countdown from 5 minutes
6 Delphi Countdown Timer
 
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[+][-]03.05.2008 at 04:22AM PST, ID: 21049636

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[+][-]03.05.2008 at 09:28AM PST, ID: 21052364

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Zones: Windows Programming, Delphi Programming
Tags: Delphi, 7, Delphi, 7
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Solution Provided By: PierreC
Participating Experts: 4
Solution Grade: A
 
 
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[+][-]03.18.2008 at 01:12AM PDT, ID: 21149079

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