topic Re: Log time in milliseconds in LabWindows/CVI

Log time in milliseconds

ahmedadelfarid — Thu, 09 Aug 2007 09:46:45 GMT

I am on measuring the intervals by which some interrupt occurs.

I want to log the time at which the interrupt occurs. It may by less than 1 ms.

What I could do, is to use the function "TimeStr()" but ius resolution is in seconds, so what I could get is something like that:

[12:25:10]
[12:25:10]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:11]
[12:25:12]
[12:25:12]

I want to measure these times in less than milliseconds.

Thanks

Re: Log time in milliseconds

LuisG — Thu, 09 Aug 2007 21:07:57 GMT

If you use the FormatDateTimeString function, you should be able to display millisecond resolution. Here is some sample code:

#define DATETIME_FORMATSTRING "[%H:%M:%S.%f]"

double currDateTime;
int bufferLen;

char *dateTimeBuffer = NULL;
GetCurrentDateTime (&currDateTime);
bufferLen = FormatDateTimeString (currDateTime, DATETIME_FORMATSTRING, NULL, 0);
dateTimeBuffer = malloc (bufferLen + 1);
FormatDateTimeString (currDateTime, DATETIME_FORMATSTRING, dateTimeBuffer, bufferLen + 1 );

Re: Log time in milliseconds

GuenterMueller — Thu, 09 Aug 2007 21:17:13 GMT

Windows provides a function called QueryPerformanceCounter. This provides excellent accuracy.

Regards, Guenter