Barcode

any one knows what are the calculations for a EAN13 barcode, I mean I have a label printer in wich I give the first 12 digits and the printer calculate the 13 digit, but the printer do it one by one and I need to process may codes.

Thanks..

Hi!

You can go to the link:
http://www.planet-source-code.com/vb...xtCodeId=43144

Code:

---

'**************************************
' Name: _EAN13 CheckDigit calculate
' Description:Build the 13th CheckDigit number of EAN13 barcode
' By: StarNiell
'
' Inputs:The barcode string format ie: "
'    123456789012". The lenght of barcode string
'    must be minimum 12 characters
'
' Returns:The CheckDigit number of barcode
'    string for the 13th position of code,
'    or -1 if the lenght of input parameter is minor of 12
'
' Assumes:The last number, at 13th position of EAN13 barcode,
'    is a check on the entire code...
'
'This code is copyrighted and has' limited warranties.
'Please see
'    http://www.Planet-Source-Code.com/xq/ASP/txtCode
'    Id.43144/lngWId.1/qx/vb/scripts/ShowCode.htm
'for details.
'**************************************

Public Function getEAN13ChekDigit(ByRef sCodice As String) As Integer
    Dim i As Integer
    Dim iVettore(11) As Integer
    Dim iTmp As Integer

    If Len(sCodice) >= 12 Then
        For i = 0 To 11
            iVettore(i) = Val(Mid(sCodice, i + 1, 1)) * (1 + ((i And 1) * 2))
            iTmp = iTmp + iVettore(i)
        Next i
        getEAN13ChekDigit = 10 - (iTmp Mod 10)
    Else
        getEAN13ChekDigit = -1
    End If
End Function

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