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C++ and Time

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Started by Tingle July 12, 2010 03:34 PM

5 comments, last by Buckeye 13 years, 9 months ago

Tingle

102

Author

July 12, 2010 03:34 PM

Hi, im looking for a way to make a number increase in ms. that has the format of 1.000, so basicly that would be 1 second and 0.500 would be 500ms.

Id like this number to start increasing from 0 once the application starts.

How can I do this? Ive tried methods like:

int _tmain(int argc, _TCHAR* argv[]){	FILETIME now;	float tempTime = 0;	float curTime = 0;	while(1)	{		GetSystemTimeAsFileTime(&now);		if(now.dwLowDateTime >= tempTime+0.00009f)		{			tempTime = now.dwLowDateTime;			curTime += 0.0001f;		}		std::cout << curTime << std::endl;	}}

But for some reson that is to slow. or I dunno. Is there anything out there that allready does what I need?

Buckeye

10,754

July 12, 2010 03:41 PM

DWORD startTime = timeGetTime(); // initialized when app startsfloat ftime;while(..){   ftime = float(timeGetTime()-startTime)/1000.0f;}

Please don't PM me with questions. Post them in the forums for everyone's benefit, and I can embarrass myself publicly.

You don't forget how to play when you grow old; you grow old when you forget how to play.

Tingle

102

Author

July 12, 2010 03:48 PM

Mhmm, im getting:

unresolved external symbol __imp__timeGetTime@0

#include "stdafx.h"#include <iostream>#include <Windows.h>int main(){	DWORD startTime = timeGetTime(); // initialized when app starts	float ftime = 0;	while(1)	{		ftime = float(timeGetTime()-startTime)/1000.0f;		std::cout << ftime << std::endl;	}	return 0;}

Edit: nvm, I didnt link WINMM.LIB.

Thanks alot!

AndyEsser

395

July 12, 2010 03:58 PM

Not sure on the accuracy of timeGetTime() but I've used QueryPerformanceCounter() and QueryPerformanceFrequency() for this kind of thing.

NightCreature83

5,061

July 12, 2010 04:05 PM

Quote:Original post by AndyEsser
Not sure on the accuracy of timeGetTime() but I've used QueryPerformanceCounter() and QueryPerformanceFrequency() for this kind of thing.

The accurace on timeGetTime is 1 ms and won't go below it, if you need more accurace QueryPerfomanceTimer is the only way. Make sure to bind it to one thread though otherwise you might get inaccuracies, http://msdn.microsoft.com/en-us/library/ms644904(VS.85).aspx

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