On Tue, Apr 15, 2014 at 2:56 AM, tsuyoshi okita <825...@gmail.com> wrote:
> *** unhandled exception in callback:
> *** Can't call method "get_text" on an undefined value at ./switch.plline
> 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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