Re: (C) Simulated progress bar

From: B. v Ingen Schenau (bart_at_ingen.ddns.info)
Date: 11/14/04 

Date: Sun, 14 Nov 2004 12:31:41 +0100

Paul Fedorenko wrote:

> My friend, the psychologist, who asked me to put together a little
> program for him has asked me if I could get the program to pause for a
> second between turns and to display a progress indicator to make it
> look like the program's running some calculations in the background.
>
> I'm thinking the progress bar would be fairly straight-forward...
> Just a for loop, set up to display a bunch of hashmarks or ASCII block
> characters
> one at a time... How would I get it to take a second or two to run
> through
> the loop? That sounds like an awfully long time.

If you can use non-standard extension, then ask in a group for your OS
what call the OS provides to let your program wait for some time.

If you can only use standard C functions, you can write a busy-loop like
this:

#define WAITING_TIME 2 /* seconds */
time_t start = time(NULL);
for (double elapsed = difftime(start, time(NULL));
     elapsed < WAITING_TIME;
     elapsed = difftime(start, time(NULL)))
{
  /* show progress bar (use elapsed to determine if a new segment can be
shown */
}

Bart v Ingen Schenau 

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