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# encode string $code as codabar image $bar
my $bar = makebarcode ($code);  # Working! Thank you!
...

# Don't work neither.
$gfx->xo_codabar($bar, $x, $y, $scale, $frame)

$gfx->image($bar, $x, $y, $scale);

# Works! 
$gfx->formimage($bar, $x, $y, $scale);