It would seem that you would use;

my $text = $_text_dirname->get('1.0','end');
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but if $_text_dirname is not a global, then you may not be able to access it from anywhere.

The other thing to look at is the SubWidget like:

my $textwidget = $_text_dirname->Subwidget('Text');
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Or $_text_dirname may be a hash ref, with one of it's keys actually being the Text widget. Maybe try dumping $_text_dirname with Data::Dumper or YAML, and see what it actually is.

This is a good example of why most Tk programmers prefer to write their gui's from scratch rather than deal with wrestling with code generators.