New PDF release: CGI Programming 101

By Jacqueline D. Hamilton

ISBN-10: 0966942612

ISBN-13: 9780966942613

Designed for clients who already know the way to construct an internet web page, this booklet demonstrates the innovations for including courses referred to as universal Gateway Interfaces (CGIs) to their sites. Hands-on examples begin with absolutely the fundamentals similar to the place to write down scripts, how one can add them and set dossier permissions, and the way to run them. extra complicated subject matters like processing types, interpreting and writing information records, and interacting with databases also are proven in transparent examples. additionally integrated are tutorials on UNIX and the way to password-protect a website.

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Additional resources for CGI Programming 101

Example text

Foreach my $p (param()) { print MAIL "$p = ", param($p), "\n"; } # Be sure to close the MAIL input stream so that the # message actually gets mailed.

EndHTML print end_html; # The dienice subroutine handles errors. cgi" method="POST"> Try testing the form. If the program runs successfully, you’ll get e-mail in a few moments 45 Chapter Four Processing Forms with the results of your post. ” A subroutine is a user-defined function. pm module, and built-in functions like shift and pop. You can also define your own custom functions.

It also does the URL-decoding for you, so you get the exact string that was typed in the form field. You can get a list of all the fieldnames used in the form by calling param with no arguments: my @fieldnames = param(); param is NOT a Variable param is a function call. You can’t do this: print "$p = param($p)
\n"; If you want to print the value of param($p), you can print it by itself: print param($p); Or call param outside of the double-quoted strings: print "$p = ", param($p), "
\n"; 36 Chapter Three CGI Environment Variables You won’t be able to use param('fieldname') inside a here-document.

Optionally you could dereference the array inside your subroutine by doing: my @localary = @{$arrayref}; A hash is dereferenced like so: my %localhash = %{$hashref}; A dereferenced array (or hash) is localized to your subroutine, so you can change the values of @newarray or %newhash without altering the original variables. You can find out a lot more about references by reading perldoc perlref and perldoc perlreftut (the Perl reference tutorial). Subroutine Return Values Subroutines can return a value: sub subname { # your code here return $somevalue; } If you omit the return statement, then the value returned by the subroutine is the value of the last expression executed in that routine.

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CGI Programming 101 by Jacqueline D. Hamilton

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