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Re: How to scraper ASP websites

by Corion (Pope)
on Sep 05, 2012 at 05:28 UTC ( #991738=note: print w/replies, xml ) Need Help??


in reply to How to scraper ASP websites

You don't show any code using WWW::Mechanize::Firefox. In theory, Firefox should find the fields. What might help is if you show the actual relevant code and (only!) the relevant HTML that declares the fields, together with the error message you get.

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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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