Page 1 of 1
ElapsedMilliseconds for C/C++
Posted: Thu Dec 09, 2010 1:42 am
by Mistrel
From what I understand, time() is implementation-specific. So I wrote a replacement using Win32. if anyone has a way of doing this in a standardized way that is more portable, I'm all ears.
I programmed this for C++. I'm assuming that it should work fine in C as well.
Code: Select all
INT64 elapsedMilliseconds() {
SYSTEMTIME sysTime;
FILETIME elapsed;
INT64 posix;
GetSystemTime(&sysTime);
SystemTimeToFileTime(&sysTime, &elapsed);
// FILETIME to POSIX
posix = *(INT64*)&elapsed;
posix = (posix - 116444736000000000) / 10000;
return posix;
}
Re: ElapsedMilliseconds for C/C++
Posted: Thu Dec 09, 2010 1:55 am
by freak
I moved this to OffTopic. The Tips section is for PureBasic codes.
Re: ElapsedMilliseconds for C/C++
Posted: Thu Dec 09, 2010 2:12 pm
by Joakim Christiansen
Helping Kwaï chang caïne or something?
Re: ElapsedMilliseconds for C/C++
Posted: Thu Dec 09, 2010 11:16 pm
by idle
was there some problem with using GetTickCount_() ?
Re: ElapsedMilliseconds for C/C++
Posted: Fri Dec 10, 2010 5:01 am
by Nituvious
idle wrote:was there some problem with using GetTickCount_() ?
He may have wanted a cross platform function.
Re: ElapsedMilliseconds for C/C++
Posted: Fri Dec 10, 2010 3:32 pm
by DarkDragon
Nituvious wrote:idle wrote:was there some problem with using GetTickCount_() ?
He may have wanted a cross platform function.
Euh.. but GetSystemTime and SystemTimeToFileTime are more WinAPI functions than one GetTickCount or timeGetTime.
Re: ElapsedMilliseconds for C/C++
Posted: Fri Dec 10, 2010 8:46 pm
by idle
I was just wondering if there was a difference with GetTickCount_() on 64 bit systems
Re: ElapsedMilliseconds for C/C++
Posted: Sat Dec 11, 2010 12:13 am
by Mistrel
GetTickCount_() has a 49 day resolution.
Re: ElapsedMilliseconds for C/C++
Posted: Sat Dec 11, 2010 12:59 am
by Rescator
idle wrote:I was just wondering if there was a difference with GetTickCount_() on 64 bit systems
Nope, which is why you should use
GetTickCount64 it's only Windows 6.x or later but it gives you like hundreds of years before it wraps?