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Help for "Cannot decode string with wide characters..." and CGI.pm

by PerlBroker (Acolyte)
on Apr 08, 2012 at 10:32 UTC ( #963988=perlquestion: print w/replies, xml ) Need Help??

PerlBroker has asked for the wisdom of the Perl Monks concerning the following question:

I have this error, and although, once this script worked, I cannot myself figure out what to do:
Cannot decode string with wide characters at /usr/lib/perl/5.10/Encode +.pm line 174.
My input is UTF-8 from the HTML form, and the script is roughly this one:
#!/usr/bin/perl use strict; use warnings; use utf8; use CGI qw(-utf8); use Encode; use encoding 'utf8'; use CGI::Carp qw(croak fatalsToBrowser); # etc... $| = 1; binmode(STDOUT, ":utf8"); binmode(STDIN, ":utf8"); my $q = new CGI; croak("It works yet..."); my $referer_url = "@{[ $q->url ]}"; croak("Cannot decode string... error before this line.");
In general, if a value from the HTML textform contains one UTF-8 character, I get that error. Any help is appreciated.

Replies are listed 'Best First'.
Re: Help for "Cannot decode string with wide characters..." and CGI.pm
by moritz (Cardinal) on Apr 08, 2012 at 16:09 UTC
    When you use utf8;, then your string literals are text strings. But this
    my $referer_url = "@{[ $q->url ]}";

    tries to interpolate an URL, and that seems to be a byte string. Simply mixing those two is a very bad idea.

    I don't see why you do it in this complicated way anyway. What's wrong with

    my $url = $q->url;

    or maybe

    my $url = decode_utf8 $q->url;

    depending on how you want to use it.

Re: Help for "Cannot decode string with wide characters..." and CGI.pm
by Anonymous Monk on Apr 08, 2012 at 11:04 UTC

    upgrade Encode CGI Encoding   cpanp -i Encode CGI Encoding

      After upgrade of Encode and CGI, it started working, at least there is no error. But now I get these characters in messages: ��
        Maybe something like this:
        #!/usr/bin/perl -l BEGIN { $| = 1;} use strict; use warnings; use utf8; use Encode; use CGI qw/:standard -utf8/; use CGI::Carp qw/fatalsToBrowser set_message/; $CGI::PARAM_UTF8 = 1; BEGIN { sub handle_errors { my $msg = shift; print "<h1>There's a problem</h1>"; print "<p>Cannot decode string: $msg</p>"; } set_message(\&handle_errors); } my $q = CGI->new; binmode STDOUT, ":encoding(UTF-8)"; my $referer_url = "@{[ $q->url ];}"; print $referer_url;
Re: Help for "Cannot decode string with wide characters..." and CGI.pm
by ikegami (Pope) on Apr 10, 2012 at 00:34 UTC

    Get rid of

    binmode(STDIN, ":utf8");

    Your corrupting the data stream passed to CGI. The proper way to decode the parameters is using

    use CGI qw(-utf8);

    which you already use. Speaking of doing the same thing twice, you did *that* twice too! First you tell Perl the source code is UTF-8

    use utf8;

    then you tell it again using a buggy version of the first method.

    use encoding 'utf8';

    The encoding is UTF-8, by the way. utf8 is something else.

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