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gettimeofday() Replacement For Windows

Started by NickGravelyn Jul 1, 2006 at 12:41 AM 4 replies 19.5k views

Original Post

Jul 1, 2006 at 12:41 AM

I'm attempting to port a Mac OS X app to Windows and everything is going well. It's a simple GLUT app, so most of the code is quite portable. The only thing missing is the gettimeofday() function. Is there anything on Windows I can use as a work around for it?

Plasmator

Jul 1, 2006 at 12:54 AM

I think it's similar to GetTickCount?
Edit: if you need microsecond resolution you can use QueryPerformanceCounter/Frequency.

NickGravelyn

Jul 1, 2006 at 1:08 AM

So far using GetTickCount() and the QueryPerformanceCounter() I haven't been able to replicate the effect. Here's the original code:

	struct timeval now;	gettimeofday(&now, NULL);	float step = (float)(now.tv_sec  - lastTick.tv_sec) + 1.0e-6 * (now.tv_usec - lastTick.tv_usec);	lastTick = now;

Any ideas how to mimic this on Windows?

Plasmator

Jul 1, 2006 at 1:22 AM

I think "time" (in the ctime header) returns what you're looking for but only in seconds. (not sure about the microsecond part tho, sorry)

Richy2k

Jul 1, 2006 at 3:13 AM

If you aren't worried about accuracy being perfect, here are 2 snippets of mine, i dont know why I didnt use QueryPerformanceCounter:

eGenericError cTimer::Update(){	gettimeofday(&m_Time, NULL);	m_TempTime = (double)m_Time.tv_sec + (double)(m_Time.tv_usec / 1000000.0);	m_FrameTime = m_TempTime - m_NewTime;	m_NewTime = m_TempTime;	return SUCCESS;}

eGenericError cTimer::Update(){	m_TempTime = (Scalar)GetTickCount()/1000.0f;	m_FrameTime = m_TempTime - m_NewTime;	m_NewTime = m_TempTime;	return SUCCESS;}

A couple of old bits of timer code I used last year.

dalleboy

Jul 1, 2006 at 4:29 AM

Try one of these:
GetSystemTimeAsFileTime - a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 (UTC).
GetSystemTime - a date and time using individual members for the month, day, year, weekday, hour, minute, second, and millisecond.

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