Public Function ean13$(chaine$)
  'V 1.0
  'Parameters: a 12-digit string
  'Return: * a chain which, displayed with the EAN13.TTF font, gives the barcode
  '         * an empty string if parameter supplied incorrect
  Dim i%, checksum%, first%, CodeBarre$, tableA As Boolean
  ean13$ = ""
  'Check that there are 12 characters
  If Len(chaine$) = 12 Then
    'And that these are many figures
    For i% = 1 To 12
      If Asc(Mid$(chaine$, i%, 1)) < 48 Or Asc(Mid$(chaine$, i%, 1)) > 57 Then
        i% = 0
        Exit For
      End If
    Next
    If i% = 13 Then
      'Calculation of the control key
      For i% = 2 To 12 Step 2
        checksum% = checksum% + Val(Mid$(chaine$, i%, 1))
      Next
      checksum% = checksum% * 3
      For i% = 1 To 11 Step 2
        checksum% = checksum% + Val(Mid$(chaine$, i%, 1))
      Next
      chaine$ = chaine$ & (10 - checksum% Mod 10) Mod 10
      'The first number is taken as is, the second comes from table A
      CodeBarre$ = Left$(chaine$, 1) & Chr$(65 + Val(Mid$(chaine$, 2, 1)))
      first% = Val(Left$(chaine$, 1))
      For i% = 3 To 7
        tableA = False
         Select Case i%
         Case 3
           Select Case first%
           Case 0 To 3
             tableA = True
           End Select
         Case 4
           Select Case first%
           Case 0, 4, 7, 8
             tableA = True
           End Select
         Case 5
           Select Case first%
           Case 0, 1, 4, 5, 9
             tableA = True
           End Select
         Case 6
           Select Case first%
           Case 0, 2, 5, 6, 7
             tableA = True
           End Select
         Case 7
           Select Case first%
           Case 0, 3, 6, 8, 9
             tableA = True
           End Select
         End Select
       If tableA Then
         CodeBarre$ = CodeBarre$ & Chr$(65 + Val(Mid$(chaine$, i%, 1)))
       Else
         CodeBarre$ = CodeBarre$ & Chr$(75 + Val(Mid$(chaine$, i%, 1)))
       End If
     Next
      CodeBarre$ = CodeBarre$ & "*"   'Adding central divider
      For i% = 8 To 13
        CodeBarre$ = CodeBarre$ & Chr$(97 + Val(Mid$(chaine$, i%, 1)))
      Next
      CodeBarre$ = CodeBarre$ & "+"   'Addition of end mark
      ean13$ = CodeBarre$
    End If
  End If
End Function

Public Function EAN_8$(chaine$)
  'V 1.0.0
  'Parametres : une chaine de 7 chiffres
  'Parameters : a 7 digits length string
  'Retour : * une chaine qui, affichee avec la police EAN13.TTF, donne le code barre
  '         * une chaine vide si parametre fourni incorrect
  'Return : * a string which give the bar code when it is dispayed with EAN13.TTF font
  '         * an empty string if the supplied parameter is no good
  Dim i%, checksum%, first%, CodeBarre$, tableA As Boolean
  EAN_8$ = ""
  'Verifier qu'il y a 7 caracteres
  'Check for 7 characters
  If Len(chaine$) = 7 Then
    'Et que ce sont bien des chiffres
    'And they are really digits
    For i% = 1 To 7
      If Asc(Mid$(chaine$, i%, 1)) < 48 Or Asc(Mid$(chaine$, i%, 1)) > 57 Then
        i% = 0
        Exit For
      End If
    Next
    If i% = 8 Then
      'Calcul de la cle de controle
      'Calculation of the checksum
      For i% = 7 To 1 Step -2
        checksum% = checksum% + Val(Mid$(chaine$, i%, 1))
      Next
      checksum% = checksum% * 3
      For i% = 6 To 1 Step -2
        checksum% = checksum% + Val(Mid$(chaine$, i%, 1))
      Next
      chaine$ = chaine$ & (10 - checksum% Mod 10) Mod 10
      'Les 4 premier chiffre viennent de la table A
      'The first 4 digits come from table A
      CodeBarre$ = ":"   'Ajout marque de debut / Add start mark
      For i% = 1 To 4
         CodeBarre$ = CodeBarre$ & Chr$(65 + Val(Mid$(chaine$, i%, 1)))
      Next
      CodeBarre$ = CodeBarre$ & "*"   'Ajout separateur central / Add middle separator
      For i% = 5 To 8
        CodeBarre$ = CodeBarre$ & Chr$(97 + Val(Mid$(chaine$, i%, 1)))
      Next
      CodeBarre$ = CodeBarre$ & "+"   'Ajout de la marque de fin / Add end mark
      EAN_8$ = CodeBarre$
    End If
  End If
End Function
Public Function EAN_13$(chaine$)
'V 1.0
'Parameters: a 12-digit string
'Return: * a chain which, displayed with the EAN13.TTF font, gives the barcode
'         * an empty string if parameter supplied incorrect
Dim i%, checksum%, first%, CodeBarre$, tableA As Boolean
EAN_13$ = ""
'Check that there are 12 characters
If Len(chaine$) = 12 Then
    'And that these are many figures
    For i% = 1 To 12
    If Asc(Mid$(chaine$, i%, 1)) < 48 Or Asc(Mid$(chaine$, i%, 1)) > 57 Then
        i% = 0
        Exit For
    End If
    Next
    If i% = 13 Then
    'Calculation of the control key
    For i% = 2 To 12 Step 2
        checksum% = checksum% + Val(Mid$(chaine$, i%, 1))
    Next
    checksum% = checksum% * 3
    For i% = 1 To 11 Step 2
        checksum% = checksum% + Val(Mid$(chaine$, i%, 1))
    Next
    chaine$ = chaine$ & (10 - checksum% Mod 10) Mod 10
    'The first number is taken as is, the second comes from table A
    CodeBarre$ = Left$(chaine$, 1) & Chr$(65 + Val(Mid$(chaine$, 2, 1)))
    first% = Val(Left$(chaine$, 1))
    For i% = 3 To 7
        tableA = False
        Select Case i%
        Case 3
        Select Case first%
        Case 0 To 3
            tableA = True
        End Select
        Case 4
        Select Case first%
        Case 0, 4, 7, 8
            tableA = True
        End Select
        Case 5
        Select Case first%
        Case 0, 1, 4, 5, 9
            tableA = True
        End Select
        Case 6
        Select Case first%
        Case 0, 2, 5, 6, 7
            tableA = True
        End Select
        Case 7
        Select Case first%
        Case 0, 3, 6, 8, 9
            tableA = True
        End Select
        End Select
    If tableA Then
        CodeBarre$ = CodeBarre$ & Chr$(65 + Val(Mid$(chaine$, i%, 1)))
    Else
        CodeBarre$ = CodeBarre$ & Chr$(75 + Val(Mid$(chaine$, i%, 1)))
    End If
    Next
    CodeBarre$ = CodeBarre$ & "*"   'Adding central divider
    For i% = 8 To 13
        CodeBarre$ = CodeBarre$ & Chr$(97 + Val(Mid$(chaine$, i%, 1)))
    Next
    CodeBarre$ = CodeBarre$ & "+"   'Addition of end mark
    EAN_13$ = CodeBarre$
    End If
End If
End Function