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Re: HELP! Label images PostScript

by Loops (Curate)
on Aug 06, 2013 at 18:59 UTC ( #1048163=note: print w/replies, xml ) Need Help??

in reply to HELP! Label images PostScript


Welcome to the monastery.

When you say that everything is working great, have you actually been able to generate and view a .ps file that contains a label with your barcode on it? Are you sure that the problem you're having is CGI, or is it that your postscript file isn't actually correct?

I ask because it seems the PostScript::MailLabels does not support embedding graphics. Take a look at the documentation "todo" section to see that it is planned in the future. So it appears you're just loading up a text field with data that has no hope of being interpreted as a graphic image.

If true, you may have to do your own label alignment code.

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[Corion]: But maybe there is some other Unicode string that will be true but have a zero width
[hippo]: For explanation, I've seen this construct in someone else's code (no names, no pack drill) and couldn't think of a situation to trigger it.
[Corion]: You'll have to look somewhere esoteric for that. Maybe some tied variable or special dualvar can also trigger that. But it's certainly not a common occurrence
[Corion]: And on 5.20, the following also outputs no find:perl -wle 'for my $x ("\x{2000}".."\ x{1fffff}") { if( $x && ! length $x ) { warn qq(<$x>); warn length $x; die } }'
[Corion]: (this time on Unix)
[hippo]: Understood. I'll have to go through the code and see if it's doing anything fancy with ties, dual-vars or non-scalars. In the end, it's probably a bug though.
[Corion]: Aaah - you should be able to do this with overload, but I would hit somebody really hard if they constructed objects that are true but the empty string, and you not knowing about the domain knowledge where this makes sense

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