Visual Basic, Timer with high accuracy

Timer with high accuracy

Author	Message
Haifang L #1 / 7	Timer with high accuracy VB5 experts, I need to display something on the screen at very accurate timing. I am not looking for very fast action but accurate. I have tried to use the HiTimer control from mabry. The accuracy of that control is 1 ms but I need microsecond accuracy. Any suggestion? Haifang Li, Ph.D. SUNY at Stony Brook
Tue, 28 Mar 2000 03:00:00 GMT

Adrian Schwaninge #2 / 7	Timer with high accuracy This is a multi-part message in MIME format. --------------C02D4AC9FD07E86C24CEC4BD Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Quote: > VB5 experts, > I need to display something on the screen at very accurate timing. I am > not looking for very fast action but accurate. I have tried to use the > HiTimer control from mabry. The accuracy of that control is 1 ms but I > need microsecond accuracy. Any suggestion? Try the OCX I attached. I tested it with graphics API's against timeGetTime and GetTickCount and it seemed a lot more accurate. For more information on the OCX see: http://www.access.ch/discovery I'm currently working on a program to display bitmaps and collect reaction times. So tell me if you find some other solutions to your project, maybe I can learn from you... Regards: Adrian --------------C02D4AC9FD07E86C24CEC4BD Content-Type: application/x-unknown-content-type-WinZip; name="clock.zip" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="clock.zip" <encoded_portion_removed> ZXN0Q2xvY2suZnJtUEsFBgAAAAAIAAgAzwEAABNMAAAAAA== --------------C02D4AC9FD07E86C24CEC4BD--
Wed, 29 Mar 2000 03:00:00 GMT

Michael Flo #3 / 7	Timer with high accuracy On Fri, 10 Oct 1997 15:14:58 -0400, Haifang Li Quote: >VB5 experts, >I need to display something on the screen at very accurate timing. I am >not looking for very fast action but accurate. I have tried to use the >HiTimer control from mabry. The accuracy of that control is 1 ms but I >need microsecond accuracy. Any suggestion? >Haifang Li, Ph.D. >SUNY at Stony Brook Are you running Windows - the environment that can run several apps at one time - well effectively it can. The program that can go off and do some disk trashing for what seems an eternity whenever it feels like it? In my oppinion you can forget that kind of accuracy. Even the 1mS timer from Mabry misses events all over the place. There are just too many variables in the system to achieve accurate timing events. Regards, Mike Floyd
Thu, 30 Mar 2000 03:00:00 GMT

Zan #4 / 7	Timer with high accuracy Quote: >In my oppinion you can forget that kind of accuracy. Even the 1mS >timer from Mabry misses events all over the place. Essentially you're right, it's not possible to guarantee any sort of response time in Windows. But we (Mabry) _do_ keep an accurate count of how many milliseconds elapsed since we were last able to fire a timer event and that count is available to the programmer. Zane
Thu, 30 Mar 2000 03:00:00 GMT

Shafayat Kama #5 / 7	Timer with high accuracy Howdy! You could try the GetTickCount API call, it's extremely accurate. It returns the time since windows has started and continues counting, you could use this to your advantage however. Regards, Shafayat Kamal http://www.iessoft.com Last updated: October 8, 1997 People who don't have time should make time. Quote: >>VB5 experts, >>I need to display something on the screen at very accurate timing. I am >>not looking for very fast action but accurate. I have tried to use the >>HiTimer control from mabry. The accuracy of that control is 1 ms but I >>need microsecond accuracy. Any suggestion?
Sun, 02 Apr 2000 03:00:00 GMT

Jack L. Linde #6 / 7	Timer with high accuracy Quote: > VB5 experts, > I need to display something on the screen at very accurate timing. I am > not looking for very fast action but accurate. I have tried to use the > HiTimer control from mabry. The accuracy of that control is 1 ms but I > need microsecond accuracy. Any suggestion? > Haifang Li, Ph.D. > SUNY at Stony Brook Look to the API calls to GetPerformanceCounter and GetPerformanceFrequency. They return a value that is a count of the master osc. If I remember my figures the frequency was about 1MHz giving resolution in that range. Of course you have the problem of windows response time, but this is the most accurate way to get time intervals. -- Jack Linder Opinions expressed are not necessarily those of my employer. Heck, I'm not even sure they're mine. (when replying do not use the addreess your system sees. I'm trying to get rid of SPAM
Mon, 03 Apr 2000 03:00:00 GMT

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