PDF::FDF::Simple(3pm) User Contributed Perl Documentation PDF::FDF::Simple(3pm)
NAME
PDF::FDF::Simple - Read and write (Acrobat) FDF files.
SYNOPSIS
my $fdf = new PDF::FDF::Simple ({ filename => '/tmp/test.fdf' });
$fdf->skip_undefined_fields(1);
$fdf->content ({
'name' => 'Fred Madison',
'organisation' => 'Luna Lounge Ltd.',
'dotted.field.name' => 'Hello world.',
'language.radio.value' => 'French',
'my.checkbox.value' => 'On', # 'On' / 'Off'
});
$fdf->save or print $fdf->errmsg;
$fdf->save ('otherfile.fdf');
my $fdfcontent = $fdf->load;
$fdfcontent = $fdf->load ($fdfstring);
print $fdf->as_string;
print "Corresponding PDF (attribute /F): ".$fdf->attribute_file."
";
print "IDs (attribute /ID): ";
print $_ foreach @{$fdf->attribute_id}; print "
";
DESCRIPTION
Helps creating and extracting the content of FDF files. It is meant to be a simple replacement for the Adobe FdfToolkit. Therefore some of
it's behavior, especially handling of diverse whitespace/newline artefacts is orientated on FdfToolkit's handling.
After the extraction process the content is available within a hash reference.
For creating FDF files it currently only supports setting text values. Anyway, this should be enough to create FDF files for text fields,
text areas, checkboxes and radio buttons.
PDF::FDF::Simple uses Parse::RecDescent and understands both, the "Kids" notation and the "dotted" notation for field names. Saving will
always use the "dotted"- notation.
Text fields / Text areas
Text fields and text areas are simply filled with the given text.
Radio button groups
In a radio button group the entry that matches exactly the field value is selected. The entries and their values are defined in the PDF
where the FDF is loaded into.
Checkboxes
In the PDF document into which the FDF is loaded a checkbox field is set to checked/unchecked with field values 'On' or 'Off', respec-
tively.
API Methods
new
Constructor. Takes a hash reference for arguments.
skip_undefined_fields
Option, default is 0. If set to a true value (e.g., 1), then fields whose value is undefined are not contained in generated fdf. By default
undefined field values are converted to empty string ('').
filename
Get/set target filename (string).
content
Get/set content of fields (hashref).
attribute_file
Get/set the corresponding PDF filename of the form. This method corresponds to the /F attribute in FDF content.
attribute_id
Get/set the list (array reference) of form IDs. This method corresponds to the /ID attribute in FDF content.
load
Load an existing FDF file named via "filename" and stores the information in a hashref (see also "content").
An optional parameter can be given that contains FDF content. In that case it is not read from file "filename".
save (optional_filename)
Save the FDF content into a file, using either the directly given "optional_filename" parameter or (if "optional_filename" is not given)
the filename that was set via "filename".
as_string
Returns the FDF content as scalar string, so you can work with it without the need to save into file.
errmsg
Get/set error message. Will be set internally when an error occured. Just read it, setting it is useless.
Internal Methods
Those methods are used internally and can be overwritten in derived classes. You shouldn't use them directly.
_pre_init
Overwritable method for setting default values for initialization before overtaking constructor params.
_post_init
Overwritable method for setting default values for initialization after overtaking constructor params and building Parse::RecDescent gram-
mar.
init
Takes over the values from the given constructor hash.
_fdf_header
Returns a string which will be written before all field data.
_fdf_footer
Returns a string which will be written after all field data.
_quote
Does all quoting for field value strings.
_fdf_field_formatstr
Returns a format string for use in sprintf that creates key/value pairs.
_map_parser_output
Puts the Parse::RecDescent output from a nested hash into a simple hash and returns its reference.
PREREQUISITES
o Parse::RecDescent (VERSION 1.94)
o Class::MethodMaker
A COMMENT ABOUT PARSING
For whose who are interested, the grammar doesn't implement a fully PDF or FDF specification (FDF is just a subset of PDF). The approach is
rather pragmatic. It only searches for /Fields and tries to ignore the surrounding rest. This "works for me" (TM) but it doesn't guarantee
that all possible FDFs can be parsed. If you have a strange FDF that cannot be parsed please send it to me with the expected content
description or extend the parser by yourself and send me a patch.
AUTHOR
o Steffen Schwigon <schwigon@webit.de>,
o Tim Schreier
LICENSE
Copyright (c) 2004, 2005 Steffen Schwigon. All rights reserved. This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
BUGS
o Deep recursion warnings with large content. Seems to be harmless but if you know how to avoid them, please drop me a mail.
FEEDBACK
I am interested in comments/enhancements/bugreports. Drop me <schwigon@webit.de> a mail if you use this module.
perl v5.8.8 2006-03-03 PDF::FDF::Simple(3pm)