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You already know that the document body should be in HTML To send output, you just print to STDOUT, as you would with any other application In an ideal world, you should consider using something like the CGI module to help you build the pages correctly It will certainly remove a lot of clutter from your script, while also providing a higher level of reliability for the HTML you produce Unfortunately, it doesn t solve any of the problems associated with a poor HTML implementation within a browser However, because you just print the information to standard output, you need to take care with errors and other information that might otherwise be sent to STDERR You can t use warn or die, because any message produced will not be displayed to the user While this might be what you want as a web developer (the information is usually recorded in the error log), it is not very user friendly The solution is to use something like the function shown in the previous redirection example to report an error back to the user Again, this is an important thing to grasp There is nothing worse from a user s point of view than this displayed in the browser:

Example C-2. The markup file for Exercise 1-2

(C13)

Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request Please contact the server administrator, webmaster@mchomecom and inform them of the time the error occurred, and anything you might have done that may have caused the error

Up until now, we have been specifically concentrating on the mechanics behind Perl CGI scripts Although we ve seen solutions for certain aspects of the process, there are easier ways of doing things Since you already know how to obtain information supplied on a web form, we will instead concentrate on the semantics and process for the script contents In particular, we ll examine the CGI module, web cookies, the debug process, and how to interface to other web-related languages

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The CGI module started out as a separate module available from CPAN It s now included as part of the standard distribution and provides a much easier interface to web programming with Perl As well as providing a mechanism for extracting elements supplied on a form, it also provides an object-oriented interface to building web pages and, more usefully, web forms You can use this interface either in its object-oriented format or with a simple functional interface Along with the standard CGI interface and the functions and object features supporting the production of good HTML, the module also supports some of the more advanced features of CGI scripting These include the support for uploading files via HTTP and access to cookies something we ll be taking a look at later in this chapter For the designers among you, the CGI module also supports cascading style sheets and frames Finally, it supports server push a technology that allows a server to send new data to a client at periodic intervals This is useful for pages, and especially images, that need to be updated This has largely been superseded by the client-side RELOAD directive, but it still has its uses For example, you can build a single CGI script for converting Roman numerals into integer decimal numbers using the following script It not only builds and produces the HTML form, but also provides a method for processing the information supplied when the user fills in and submits the form

6 Calculate the argument of the cosine term: x= 7 Calculate the slant factor: F = 10 + 160(053 E)3 (C15) 2 (t 50400) P ER (C14)

#!/usr/local/bin/perl -w use CGI qw/:standard/; print header, start_html('Roman Numerals Conversion'), h1('Roman Numeral Converter'), start_form, "What's the Roman Numeral number ", textfield('roman'),p, submit, end_form,p,hr,p; if (param()) { print(h3('The value is ', parse_roman(uc(param('roman')))),p,hr); } sub parse_roman

18:

Developing for the World Wide Web (WWW)

3 n=0

{ $_ = shift; my %roman = ('I' => 1, 'V' => 5, 'X' => 10, 'L' => 50, 'C' => 100, 'D' => 500, 'M' => 1000, ); my @roman = qw/M D C L X V I/; my @special = qw/CM CD XC XL IX IV/; my $result = 0; return 'Invalid numerals' unless(m/[IVXLXDM]+/); foreach $special (@special) { if (s/$special//) { $result += $roman{substr($special,1,1)} - $roman{substr($special,0,1)}; } } foreach $roman (@roman) { $result += $roman{$roman} while s/$roman//; } return $result; }

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