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Increasing Accuracy of GetLocalTime

Posted on 1998-09-03
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Last Modified: 2013-11-20
I'm timing some serial comms, and I need millisecond accuracy..  At the moment, I'm getting results of either 0 milliseconds or 10milliseconds in Transmission Time.  Is there a way to increase the Accuracy of Running GetLocalTime.  

What would be better if there was a class already  available that I could use..
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Question by:jubjub
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chensu earned 100 total points
ID: 1321712
Use timeGetTime instead.

"Note that the value returned by the timeGetTime function is a DWORD value. The return value wraps around to 0 every 2^32 milliseconds, which is about 49.71 days.This can cause problems in code that directly uses the timeGetTime return value in computations, particularly where the value is used to control code execution. You should always use the difference between two timeGetTime return values in computations.

Windows NT: The default precision of the timeGetTime function can be five milliseconds or more, depending on the machine. You can use the timeBeginPeriod and timeEndPeriod functions to increase the precision of timeGetTime. If you do so, the minimum difference between successive values returned by timeGetTime can be as large as the minimum period value set using timeBeginPeriod and timeEndPeriod. Use the QueryPerformanceCounter and QueryPerformanceFrequency functions to measure short time intervals at a high resolution,

Windows 95: The default precision of the timeGetTime function is 1 millisecond. In other words, the timeGetTime function can return successive values that differ by just 1 millisecond. This is true no matter what calls have been made to the timeBeginPeriod and timeEndPeriod functions."
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by:jubjub
ID: 1321713
Thanx Dude..
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