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Groups > comp.lang.c > #168195
| From | Andreas <nospam@gmx.de> |
|---|---|
| Newsgroups | comp.lang.c, comp.lang.c++ |
| Subject | Re: what is the best way to get microseconds of time on Windows in C or C++ ? |
| Date | 2022-11-16 13:15 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <tl2k84$2beqi$1@dont-email.me> (permalink) |
| References | <tk1p0t$1iv03$1@dont-email.me> <KG89L.4244$KkB2.2249@fx47.iad> <tkuh77$1rt0u$1@dont-email.me> <87zgctj8wz.fsf@nosuchdomain.example.com> <tl176i$25jh1$1@dont-email.me> |
Cross-posted to 2 groups.
Am 16.11.2022 um 00:26 schrieb Lynn McGuire:
> This works fine for me:
>
> // from:
> //
> https://stackoverflow.com/questions/10905892/equivalent-of-gettimeday-for-windows
>
> struct timezone {
> int tz_minuteswest;
> int tz_dsttime;
> };
>
> int mygettimeofday (struct timeval *tv, struct timezone *tz)
> {
> if (tv) {
> FILETIME filetime; /* 64-bit value representing
> the number of 100-nanosecond intervals since January 1, 1601 00:00 UTC */
> ULARGE_INTEGER x;
> ULONGLONG usec;
> static const ULONGLONG epoch_offset_us = 11644473600000000ULL;
Wrong value. Correct value is 116444736000000000ULL (9 trailing zeros).
Rough estimation (1970-1601)*365*24*60*60 = 11'636'784'000 seconds
(ignoring Feb 29 in leap years). Additional 6 zeros to convert seconds
to microseconds.
> /* microseconds betweeen Jan 1,1601 and Jan 1,1970 */
>
> #if _WIN32_WINNT >= _WIN32_WINNT_WIN8
> GetSystemTimePreciseAsFileTime ( & filetime);
> #else
> GetSystemTimeAsFileTime ( & filetime);
> #endif
> x.LowPart = filetime.dwLowDateTime;
> x.HighPart = filetime.dwHighDateTime;
> usec = x.QuadPart / 10 - epoch_offset_us;
> tv->tv_sec = (time_t) (usec / 1000000ULL);
> tv->tv_usec = (long) (usec % 1000000ULL);
> }
> if (tz) {
> TIME_ZONE_INFORMATION timezone;
> GetTimeZoneInformation(&timezone);
> tz->tz_minuteswest = timezone.Bias;
> tz->tz_dsttime = 0;
> }
> return 0;
> }
>
> Thanks,
> Lynn
>
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what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-03 20:14 -0500
Re: what is the best way to get microseconds of time on Windows in C or C++ ? DFS <nospam@dfs.com> - 2022-11-03 21:51 -0400
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 00:06 -0500
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Christian Gollwitzer <auriocus@gmx.de> - 2022-11-04 08:03 +0100
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 14:32 -0500
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-11-04 09:07 -0700
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 14:33 -0500
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Opus <ifonly@youknew.org> - 2022-11-06 20:53 +0100
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Juha Nieminen <nospam@thanks.invalid> - 2022-11-04 07:35 +0000
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 14:24 -0500
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-11-04 19:50 +0000
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 15:16 -0500
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-11-04 15:05 -0700
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 17:35 -0500
Re: what is the best way to get microseconds of time on Windows in C or C++ ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-11-04 15:56 -0700
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-11-04 16:15 -0700
Re: what is the best way to get microseconds of time on Windows in C or C++ ? scott@slp53.sl.home (Scott Lurndal) - 2022-11-04 13:44 +0000
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-04 14:34 -0500
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-14 16:58 -0600
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-11-14 17:36 -0800
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-11-15 17:26 -0600
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Andreas <nospam@gmx.de> - 2022-11-16 13:15 +0100
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Bonita Montero <Bonita.Montero@gmail.com> - 2022-11-04 20:49 +0100
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Bart <bc@freeuk.com> - 2022-11-04 22:31 +0000
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Bonita Montero <Bonita.Montero@gmail.com> - 2022-11-05 06:40 +0100
Re: what is the best way to get microseconds of time on Windows in C or C++ ? Manu Raju <MR@invalid.invalid> - 2022-11-20 21:30 +0000
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