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EANofISBN ( pool ; ISBNnr )

Generate the EAN barcode for the given ISBN#

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Reinder Wolting ABECON http://www.abecon.nl

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/* http://www.export911.com/e911/coding/eanParity.htm */ Let ( [ xPool = Filter ( pool ; "0123456789" ) ; xISBN = Left ( Filter ( ISBNnr ; "0123456789" ) ; 9 ) ; xTotal = xPool & xISBN ; xEven = 3 * ( Middle ( xTotal ; 2 ; 1 ) + Middle ( xTotal ; 4 ; 1 ) + Middle ( xTotal ; 6 ; 1 ) + Middle ( xTotal ; 8 ; 1 ) + Middle ( xTotal ; 10 ; 1 ) + Middle ( xTotal ; 12 ; 1 ) ) ; xOdd = Middle ( xTotal ; 1 ; 1 ) + Middle ( xTotal ; 3 ; 1 ) + Middle ( xTotal ; 5 ; 1 ) + Middle ( xTotal ; 7 ; 1 ) + Middle ( xTotal ; 9 ; 1 ) + Middle ( xTotal ; 11 ; 1 ) ; xDigit = 10 - Mod ( xEven + xOdd ; 10 ) ]; xPool & xISBN & if ( xDigit = 10 ; 0 ; xDigit ) ) Click to copy

EAN barcodes of books are generated from their ISBN#. This function does that trick. The pool number can differ because of the change in ISBN number from 10 to 13 digits (see http://www.niso.org/standards/resources/ISBN.html )
To get a correct ISBN number for this function, you can use the ISBN custom function that I posted here too.

 

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