Re: trouble with reading from pipes

[zentara <zentara zentara net>]

On Wed, 25 Jan 2006 12:42:31 -0600
Daniel Davidson <danield igb uiuc edu> wrote:

> This may be a problem with my understanding of perl and not with GTK,
> but here goes anyway.
>
> In my program I create three pairs of pipes:
>
> pipe($fractread,$fractwrite);
> pipe($progread,$progwrite);
> pipe($statusread,$statuswrite);
>
> which I plan to use to get information from forked functions.
>
> I also set up a watcher to notice when one of these pipes are written to
> by the child process.
>
> $tag = Gtk2::Helper->add_watch(fileno($fractread), 'in', \&setstatus);
> sub setstatus{
>      $progressbar->set_text(<$progread>);
>      $progressbar->set_fraction(<$fractread>);
>      Gtk2->main_iteration while Gtk2->events_pending;
>      print "in status\n";
        return 1;  #so callback continues

> }
>
> And finally in the child process I print to the pipe.
>      print $fractwrite $count/$totaldays;
>      print $statuswrite "Populating Database $count of $totaldays
> ".int($count/$totaldays*100)."%";
>
> Only problem is that nothing ever happens, even though I know the child
> process is running.  Any ideas what I am screwing up?

It just so happens today I was studying the Chapter cover Gtk2::Helper.

Get this great tutorial at:
http://forge.novell.com/modules/xfcontent/downloads.php/exam/documentation/



-- 
I'm not really a human, but I play one on earth.
http://zentara.net/japh.html