calling a C executable from inside a Perl script Post: 85369

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LEARN ABOUT DEBIAN

cgi::xmlform

XMLForm(3pm)						User Contributed Perl Documentation					      XMLForm(3pm)

NAME

       CGI::XMLForm - Extension of CGI.pm which reads/generates formated XML.

       NB: This is a subclass of CGI.pm, so can be used in it's place.

SYNOPSIS

	 use CGI::XMLForm;

	 my $cgi = new CGI::XMLForm;

	 if ($cgi->param) {
	       print $cgi->header, $cgi->pre($cgi->escapeHTML($cgi->toXML));
	 }
	 else {
	       open(FILE, "test.xml") or die "Can't open: $!";
	       my @queries = ('/a', '/a/b*', '/a/b/c*', /a/d');
	   print $cgi->header,
		     $cgi->pre($cgi->escapeHTML(
			 join "
", $cgi->readXML(*FILE, @queries)));
	 }

DESCRIPTION

       This module can either create form field values from XML based on XQL/XSL style queries (full XQL is _not_ supported - this module is
       designed for speed), or it can create XML from form values. There are 2 key functions: toXML and readXML.

       toXML

       The module takes form fields given in a specialised format, and outputs them to XML based on that format. The idea is that you can create
       forms that define the resulting XML at the back end.

       The format for the form elements is:

	 <input name="/body/p/ul/li">

       which creates the following XML:

	 <body>
	   <p>
		 <ul>
		   <li>Entered Value</li>
		 </ul>
	       </p>
	 </body>

       It's the user's responsibility to design appropriate forms to make use of this module. Details of how come below...

       Also supported are attribute form items, that allow creation of element attributes. The syntax for this is:

	 <input name="/body/p[@id='mypara' and @onClick='someFunc()']/@class">

       Which creates the following XML:

	 <body>
	   <p id="mypara" onClick="someFunc()" class="Entered Value"></p>
	 </body>

       Also possible are relative paths. So the following form elements:

	 <input type="hidden" name="/table/tr">
	 <input type="text" name="td">
	 <input type="text" name="td">
	 <input type="text" name="../tr/td">

       Will create the following XML:

	 <table>
	   <tr>
		 <td>value1</td>
		 <td>value2</td>
	       </tr>
	       <tr>
		 <td>value3</td>
	       </tr>
	 </table>

SYNTAX

       The following is a brief syntax guideline

       Full paths start with a "/" :

	 "/table/tr/td"

       Relative paths start with either ".." or just a tag name.

	 "../tr/td"
	 "td"

       Relative paths go at the level above the previous path, unless the previous path was also a relative path, in which case it goes at the
       same level. This seems confusing at first (you might expect it to always go at the level above the previous element), but it makes your
       form easier to design. Take the following example: You have a timesheet (see the example supplied in the archive) that has monday,tues-
       day,etc. Our form can look like this:

	 <input type="text" name="/timesheet/projects/project/@Name">
	 <input type="text" name="monday">
	 <input type="text" name="tuesday">
	 ...

       Rather than:

	 <input type="text" name="/timesheet/projects/project/@Name">
	 <input type="text" name="monday">
	 <input type="text" name="../tuesday">
	 <input type="text" name="../wednesday">
	 ...

       If unsure I recommend using full paths, relative paths are great for repeating groups of data, but weak for heavily structured data. Pic-
       ture the following paths:

	 /timesheet/employee/name/forename
	 ../surname
	 title
	 ../department

       This actually creates the following XML:

	 <timesheet>
	   <employee>
		 <name>
		   <forename>val1</forname>
		       <surname>val2</surname>
		       <title>val3></title>
		 </name>
		 <department>val4</department>
	       </employee>
	 </timesheet>

       Confusing eh? Far better to say:

	 /timesheet/employee/name/forename
	 /timesheet/employee/name/surname
	 /timesheet/employee/name/title
	 /timesheet/employee/department

       Or alternatively, better still:

	 /timesheet/employee/name (Make hidden and no value)
	 forename
	 surname
	 title
	 ../department

       Attributes go in square brackets. Attribute names are preceded with an "@", and attribute values follow an "=" sign and are enclosed in
       quotes. Multiple attributes are separated with " and ".

	 /table[@bgcolor="blue" and @width="100%"]/tr/td

       If setting an attribute, it follows after the tag that it is associated with, after a "/" and it's name is preceded with an "@".

	 /table/@bgcolor

       readXML

       readXML takes either a file handle or text as the first parameter and a list of queries following that. The XML is searched for the queries
       and it returns a list of tuples that are the query and the match.

       It's easier to demonstrate this with an example. Given the following XML:

	 <a>Foo
	   <b>Bar
		 <c>Fred</c>
		 <c>Blogs</c>
	       </b>
	       <b>Red
		 <c>Barbara</c>
		 <c>Cartland</c>
	       </b>
	       <d>Food</d>
	 </a>

       And the following queries:

	 /a
	 /a/b*
	 c*
	 /a/d

       it returns the following result as a list:

	 /a
	 Foo
	 /a/b
	 Bar
	 c
	 Fred
	 c
	 Blogs
	 /a/b
	 Red
	 c
	 Barbara
	 c
	 Cartland
	 /a/d
	 Food

       (NB: This is slightly incorrect - for /a and /a/b it will return "Foo
    " and "Bar
      " respectively).

       The queries support relative paths like toXML (including parent paths), and they also support wildcards using ".*" or ".*?" (preferably
       ".*?" as it's probably a better match). If a wildcard is specified the results will have the actual value substituted with the wildcard.
       Wildcards are a bit experimental, so be careful ;-)

       Caveats

       There are a few caveats to using this module:

AUTHOR

	   Matt Sergeant msergeant@ndirect.co.uk, sergeant@geocities.com

	   Based on an original concept, and discussions with, Jonathan Eisenzopf.  Thanks to the Perl-XML mailing list for suggesting the XSL
	   syntax.

	   Special thanks to Francois Belanger (francois@sitepak.com) for his mentoring and help with the syntax design.

SEE ALSO

       CGI(1), CGI::XML

perl v5.8.8							    2005-01-18							      XMLForm(3pm)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Calling an Executable C file from the script (URGENT HELP PLX ! )

Discussion started by: phantom308

2. Shell Programming and Scripting

differences in calling another script inside script

Discussion started by: balareddy

3. Shell Programming and Scripting

Running a unix script(which is calling another script inside that) in background

Discussion started by: rohithji

4. Shell Programming and Scripting

Automatically select records from several files and then run a C executable file inside the script

Discussion started by: Gtolis