Roderich-san, you rock:->!!!
-------- Original Message --------
Subject: Re: Re: Help with get_text() for Gtk3::Entry widget
Date: Tue, 15 Apr 2014 09:33:16 +0200
From: Roderich Schupp <roderich.sch...@gmail.com>
To: tsuyoshi okita <825...@gmail.com>
CC: gtk-perl-list@gnome.org
On Tue, Apr 15, 2014 at 2:56 AM, tsuyoshi okita <825...@gmail.com
<mailto:825...@gmail.com>> wrote:
*** unhandled exception in callback:
*** Can't call method "get_text" on an undefined value at
./switch.pl <http://switch.pl> line 28.
This call to get_text() is in the closure for the "changed" signal.
The problem is $count: $count is a "free" variable wrt sub { ... }, i.e.
$count is defined outside the sub's lexical scope.
But $count is defined in file scope and when the signal is emitted, its
value is 2!
Hence the code executed is actually
warn "You've entered: ", ${ "entry_2" }->get_text();
In your later post, you avoided this problem
${ "entry_" . $count }->signal_connect(
'changed' => \&enter_get_text_calling, \${ "entry_" .
$count });
Now the "changed" closure (closure in the GObject sense) is a simple
Perl sub (not using any free variables).
And the "data" argument (\${ "entry_" . $count }) to signal_connect is
now evaluated at the time signal_connect() is called, hence uses the
same value of $count as for the invocant of signal_connect().
Cheers, Roderich
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