fig17_13.pl

PERL语言资料 可以用于PERL程序设计

#!perl
# Fig 17.13: fig17_13.pl
# A program that collects search results.

use strict;
use warnings;
use WWW::Search;
use CGI qw( :standard );

my @engines;
my $search;

my $query = param( "query" );
my $amount = param( "amount" );

if ( !$query ) {
   print( header(), start_html() );
   print( h1( "Please try again." ) );
   print( "<a href = \"/cgi-bin/fig17_12.pl\">Go back</a>" );
   print( end_html() );
   exit();
}

if ( !$amount || $amount > 50 ) {
   $amount = 5;
}

my $value;

push( @engines, "AltaVista" ) if ( param( "AltaVista" ) );
push( @engines, "HotBot" ) if ( param( "HotBot" ) );
push( @engines, "WebCrawler" ) if ( param( "WebCrawler" ) );
push( @engines, "NorthernLight" ) if ( param( "NorthernLight" ) );

print( header() );
print( start_html( "Web Search" ) );

foreach ( @engines ) {
   my $search = new WWW::Search( $_ );
   $search->native_query( WWW::Search::escape_query( $query ) );
   print( b( i( "Web sites found by $_:" ) ), br() );

   for ( 1 .. $amount ) {
      my $result = $search->next_result();
      $value = $result->url();
      print( "<a href = $value>$value</a>" );
      print( br() );
   }

   print( br() );
}

print( end_html() );

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#  (C) Copyright 2001 by Deitel & Associates, Inc. and Prentice Hall.     #
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#  development, research, and testing of the theories and programs        #
#  to determine their effectiveness. The authors and publisher make       #
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