Arithmetic overflow Tick counter with GetLastInputInfo (User32.dll)

Hallo evrybody,

How Tick cost may return less than GetLastInputInfo in the attached vi? When I run vi, I sometimes get an average arithmetic overflow when I subtract LastInputInfo time at the tick counter value.

I use LabView Base 2015 SP1 on W7 64 bit Proffesional SP1 (32-bit 15.0.1f1).

Wladimir

I have not tried either, but it is useful to read the documentation:

https://msdn.Microsoft.com/en-us/library/Windows/desktop/ms646302 (v = vs. 85) .aspx

Although it does not too many details, he said that it should not be incremental, so you could get more data (which are not what you see) or you could get data from another source (for example, if someone called SendInput). I have no idea who check County SendInput uses, but this could definitely represent a scenario that explains what you see.

In general, I would say that if you want to compare times, make sure you have a canonical time source.

Tags: NI Software

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