Re: capturing output from running process crashes gtk2

[Mark Glines <mark glines org>]

Ratcliffe, Jeffrey (Peters) wrote:
> > Use lexical filehandles (instead of oldstyle global ones), like so:
> >
> >   my ($write, $read, $error);
> >   my $pid = open3($write, $read , $error, "./test_scan" );
> >   ...
> >   Glib::IO->add_watch(fileno($error), 'in', sub {
> >   ...
> >                               sysread $error, $line, 1024;
>
> I get then:
>
> Can't use an undefined value as a symbol reference at ./test_dialog3 line 48.
>
> line 48 being the end of the add_watch sub.

Scalar filehandles would definitely be the way to go, but unfortunately,
open3() with scalar filehandles is buggy... it doesn't set $error properly.

http://rt.perl.org/rt3/Public/Bug/Display.html?id=31738

You might be able to work around it by predefining them as IO::Handle
objects, or something like that.

Mark