How to use Ctime?

[andydang]

Hello,
How are you all? A question, or more like a problem has crept up in my programming as of late. I tried to solve it by myself, but to no avail. It concerns CTime.

There's a part of my program where I require it to execute a certain operation every 100ms, but so far, I could only make a stopwatch type timer. Is there a way where every 100ms, a whole set of subroutine will run?

I ask this becouse I am currently writing a simulation program and I have in mind discrete events happening every 100ms in my simulation.

Please help.

-Andy

[Wombat]

I believe what u need is not CTime class. You need a Timer. Check out SetTimer and KillTimer in MSDN.

[andydang]

I did that, and i used that. this this the code fragment that i use.

void ???::OnTimer(UINT nIDEvent)
{...
 switch (nIDEvent)
  {
  case ID_CLOCK_TIMER
  break;
  case ID_COUNT_TIMER
  //**
  //the only place (that i know of) that executes once every 100ms
  m_iCount++;
  break;
  }
UpdateData(FALSE);
...
}
...
void ???::OnSimulate()
{
//*
m_iCount=0;
SetTimer(ID_COUNT_TIMER, 100, NULL)
}

is there a way where i can circumvent this method? I meant that the only way i can make sure something happens every 100ms is to put my codes at ** instead of at *. Now, for short codes I wouldn't mind, but the bulk(hundreds of lines) of my codes depend upon it executing every 100ms. is there anyway that i could put my codes in * and still it executes every 100ms??

[astanley]

The WM_TIMER message is not accurate for what you require; they are processed at low priority, and are often delayed whilst other higher priority messages are processed. I think what you need is MSHTML Timer - look it up in MSDN.

[andydang]

thank you astanley for your reply. I searched MSDN and I never found the MSHTML Timer you told me. but I did found something about worker thread. But the method described there is a little too crude for my purposes.

now, I believe I have solved my little hiccup; I call the class that I want from the OnTimer class. so far, it works.

just out of curiousity, how do you guys do a simulation software that 'refreshes' the window every few seconds? i mean re-evaluate the variables, re-roll the dice so to speak.

[VladimirF]

Originally posted by astanley
The WM_TIMER message [...] processed at low priority, and are often delayed whilst other higher priority messages are processed.

"low priority" and "higher priority" messages??? On Windows?
I always thought there is ONE message queue...