Re: how to compute elapsed time

From:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 11 Sep 2008 20:44:56 -0400

Message-ID:

<u4kWODHFJHA.5104@TK2MSFTNGP02.phx.gbl>

"Nick Schultz" <nick.schultz@flir.com> wrote in message
news:esYB0oGFJHA.4628@TK2MSFTNGP05.phx.gbl...

I'm trying to measure the performance of my loading time and I am getting
wierd results in my elapsed time computation

here is my code:

//load file
CTime before = CTime::GetCurrentTime();
m_DataLogger->loadFile(FileDlg.GetFileName());
CTime after = CTime::GetCurrentTime();

CString text;
text.AppendFormat("loading took %d seconds",after.GetSecond() -
before.GetSecond());
AfxMessageBox(text,MB_OK|MB_APPLMODAL);

Sometimes it displays the correct time, but other times it gives me
totally random timings, such as -44 or 8 seconds when I know it took much
longer than 8 seconds.

Also note loading my file (specifically a big one) pegs the CPU and hangs
for a bit. ( i know its not desired behavior)

what should I be doing?

CTime::GetSecond() only returns a number between 0 and 59. When the minute
changes GetSecond cycles around to 0.

Try GetTickCount() instead. It has the same problem, but only once every 49
days or so :)

--
Scott McPhillips [VC++ MVP]