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ISBN(3)               User Contributed Perl Documentation              ISBN(3)

       Business::ISBN - work with International Standard Book Numbers

               use Business::ISBN;

               # 10 digit ISBNs
               $isbn10 = Business::ISBN->new('1565922573');
               $isbn10 = Business::ISBN->new('1-56592-257-3');

               # 13 digit ISBNs
               $isbn13 = Business::ISBN->new('978-0-596-52724-2');

               # convert
               $isbn10 = $isbn13->as_isbn10;    # for the 978 prefixes

               $isbn13 = $isbn10->as_isbn13;

               # maybe you don't care what it is as long as everything works
               $isbn = Business::ISBN->new( $ARGV[0] );

               #print the ISBN with hyphens at usual positions
               print $isbn->as_string;

               #print the ISBN with hyphens at specified positions.
               #this not does affect the default positions
               print $isbn->as_string([]);

               #print the group code or publisher code
               print $isbn->group_code;

               print $isbn->publisher_code;

               #check to see if the ISBN is valid

               #fix the ISBN checksum.  BEWARE:  the error might not be
               #in the checksum!

               # create an EAN13 barcode in PNG format

       This modules handles International Standard Book Numbers, including
       ISBN-10 and ISBN-13.

   Function interface
       valid_isbn_checksum( ISBN10 | ISBN13 )
           This function is exportable on demand, and works for either 10 or
           13 character ISBNs).

                   use Business::ISBN qw( valid_isbn_checksum );

           Returns 1 if the ISBN is a valid ISBN with the right checksum.

           Returns 0 if the ISBN has valid prefix and publisher codes, but an
           invalid checksum.

           Returns undef if the ISBN does not validate for any other reason.

   Object interface
           The constructor accepts a scalar representing the ISBN.

           The string representing the ISBN may contain characters other than
           "[0-9xX]", although these will be removed in the internal
           representation.  The resulting string must look like an ISBN - the
           first nine characters must be digits and the tenth character must
           be a digit, 'x', or 'X'.

           The constructor attempts to determine the group code and the
           publisher code.  If these data cannot be determined, the
           constructor sets "$obj->is_valid" to something other than
           "GOOD_ISBN".  An object is still returned and it is up to the
           program to check "$obj->is_valid" for one of five values (which may
           be exported on demand). The actual values of these symbolic
           versions are the same as those from previous versions of this
           module which used literal values.


           If you have one of these values and want to turn it into a string,
           you can use the %Business::ISBN::ERROR_TEXT hash, which is
           exportable by asking for it explicitly in the import list.

                   use Business::ISBN qw(%ERROR_TEXT);

           The string passed as the ISBN need not be a valid ISBN as long as
           it superficially looks like one.  This allows one to use the
           "fix_checksum()" method.  Despite the disclaimer in the discussion
           of that method, the author has found it extremely useful.  One
           should check the validity of the ISBN with "is_valid()" rather than
           relying on the return value of the constructor.  If all one wants
           to do is check the validity of an ISBN, one can skip the object-
           oriented interface and use the "valid_isbn_checksum()" function
           which is exportable on demand.

           If the constructor decides it cannot create an object, it returns
           "undef".  It may do this if the string passed as the ISBN cannot be
           munged to the internal format meaning that it does not even come
           close to looking like an ISBN.

   Instance methods
           Returns the starting ISBN. Since you may insert hyphens or fix
           checksums, you might want to see the original data.

           Returns the starting ISBN after normalization, which removes
           anything that isn't a digit or a valid checksum character.

           Returns the current value of ISBN, even if it has an invalid
           checksum.  This is the raw data so it doesn't have the hyphens. If
           you want hyphenation, try "as_string".

           The "isbn" method should be the same as "as_string( [] )".

           Return the error code for the reason the ISBN isn't valid. The
           return value is a key in %ERROR_TEXT.

           Return true if the ISBN is valid, meaning that it has a valid
           prefix (for ISBN-13), group code, and publisher code; and its
           checksum validates.

           Returns either "ISBN10" or "ISBN13".

           Returns the prefix for the ISBN. This is currently either 978 or
           979 for ISBN-13. It returns the empty string (so, a defined value)
           for ISBN-10.

           Returns the group code for the ISBN. This is the numerical version,
           for example, '0' for the English group. The valid group codes come
           from "Business::ISBN::Data".

           Returns the group name for the ISBN. This is the string version.
           For instance, 'English' for the '0' group. The names come from

           Returns the publisher code for the ISBN. This is the numeric
           version, for instance '596' for O'Reilly Media.

           Returns the article code for the ISBN. This is the numeric version
           that uniquely identifies the item.

           Returns the checksum code for the ISBN. This checksum may not be
           valid since you can create an object an fix the checksum later with

           Returns "Business::ISBN::GOOD_ISBN" for valid checksums and
           "Business::ISBN::BAD_CHECKSUM" otherwise. This does not guarantee
           that the rest of the ISBN is actually assigned to a book.

           Checks the checksum and modifies the ISBN to set it correctly if

       as_string(),  as_string([])
           Return the ISBN as a string.  This function takes an optional
           anonymous array (or array reference) that specifies the placement
           of hyphens in the string.  An empty anonymous array produces a
           string with no hyphens. An empty argument list automatically
           hyphenates the ISBN based on the discovered group and publisher
           codes.  An ISBN that is not valid may produce strange results.

           The positions specified in the passed anonymous array are only used
           for one method use and do not replace the values specified by the
           constructor. The method assumes that you know what you are doing
           and will attempt to use the least three positions specified.  If
           you pass an anonymous array of several positions, the list will be
           sorted and the lowest three positions will be used.  Positions less
           than 1 and greater than 12 are silently ignored.

           A terminating 'x' is changed to 'X'.

           Returns a new ISBN object. If the object is already ISBN-10, this
           method clones it. If it is an ISBN-13 with the prefix 978, it
           returns the ISBN-10 equivalent. For all other cases it returns

           Returns a new ISBN object. If the object is already ISBN-13, this
           method clones it. If it is an ISBN-10, it returns the ISBN-13
           equivalent with the 978 prefix.

           In scalar context, returns an anonymous array of related ISBNs
           using xISBN.  In list context, returns a list.

           This feature requires "LWP::Simple".

           Returns image data in PNG format for the barcode for the ISBN. This
           works with ISBN-10 and ISBN-13. The ISBN-10s are automaically
           converted to ISBN-13.

           This requires "GD::Barcode::EAN13".


       * i would like to create the bar codes with the price extension

       This source is in Github:


       brian d foy "<bdfoy@cpan.org>"

       Copyright (c) 2001-2009, brian d foy, All Rights Reserved.

       You may redistribute this under the same terms as Perl itself.

       Thanks to Mark W. Eichin "<eichin@thok.org>" for suggestions and
       discussions on EAN support.

       Thanks to Andy Lester "<andy@petdance.com>" for lots of bug fixes and

       Ed Summers "<esummers@cpan.org>" has volunteered to help with this

perl v5.12.1                      2009-01-25                           ISBN(3)

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