LWP::Simple? Prototype mismatch?

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

I just swept aside the dense curtain of cobwebs over the entrance to my cell and looked round the room I used to know so well but which I haven't for so long.. and my eye lighted on the Name Space node which I indexed ages ago. I wrote a script then to update the index and it worked fine. But now when I run it I get

Prototype mismatch: sub main::head vs ($) at ns.pl line 6

I think this is an LWP::Simple prob... but it's a complete new one on me. Has something change when I was in my Rip Van Winkle sleep?

If any kind monk can put me straight I'd be most grateful, and doubly glad because then I could update the wretched index. The bit of the script that (I think) is breaking down is

#!/usr/bin/perl -w

use strict;
use lib '/home/httpd/lib';
use CGI qw/:standard :cgi-lib/;
use LWP::Simple;

my $text = get 'http://www.perlmonks.net/index.pl?node_id=110166';

my %names = (George_Sherston => 110166);

while ($text =~ s#<a HREF="/index\.pl\?node_id=(\d+)">.+?</a><BR> by <
+a HREF="/index\.pl\?node_id=(\d+)">(.+?)</a> on \w{3} \d{1,2}, \d{4} 
+at# #) {
    unless (defined $names{$3}) {
        $names{$3} = $1;
    }
}
[download]

Many thanks - it's lovely to be back in the hallowed halls.

§ George Sherston

Comment on LWP::Simple? Prototype mismatch? Select or Download Code

Replies are listed 'Best First'.
Re: LWP::Simple? Prototype mismatch? by Arunbear (Prior) on May 16, 2005 at 13:30 UTC
This happens because both LWP::Simple and CGI are exporting a sub called head. You aren't using LWP::Simple::head so to prevent it from being imported you can replace `use LWP::Simple;` [download] with `use LWP::Simple qw/get/;` [download]	[reply] [d/l] [select]
Re^2: LWP::Simple? Prototype mismatch? by Fletch (Bishop) on May 16, 2005 at 13:47 UTC
This is why it's a good practice to always specify exactly what you're importing (either by listing it explicitly or by using an appropriate `:TAG`), and to explicitly say `use Module ()` if you're not importing anything.	[reply] [d/l]
Re^2: LWP::Simple? Prototype mismatch? by George_Sherston (Vicar) on May 16, 2005 at 13:53 UTC
Aaah... thankyou. Well, they've been building subs left right and centre.. I remember when this was open country as far as they eye could see.. that's progress.. Thanks again, JR § George Sherston	[reply]
Re: LWP::Simple? Prototype mismatch? by jeffa (Bishop) on May 16, 2005 at 13:34 UTC
Don't forget to Super Search, which yeiled this bit of info: Re: Re: Re: Crontab error!. Also, consider dusting off the cobwebs of your old script with the newer WWW::Mechanize. jeffa L-LL-L--L-LL-L--L-LL-L-- -R--R-RR-R--R-RR-R--R-RR B--B--B--B--B--B--B--B-- H---H---H---H---H---H--- (the triplet paradiddle with high-hat)	[reply]


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