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Mod10 and Mod43 Crystal Report Custom Function


We need to add a Mod10 or a Mod43 custom function to an IDAutomation product for Crystal Reports.

Can you provide a general guide for it?

Operating System: Windows

Application: Crystal Reports, Business Objects

12-08-16     7.8 year(s) ago    

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James

Best Answer

I. Create Function (choose #1 or #2):

1. Mod 43:
• Open the Formula Workshop: In the top bar, choose Report > Formula Workshop
• In the Formula Workshop, choose the ‘white paper icon’ image > Custom Function > enter in the name mod43calc and choose the Use Editor button.

When the window pops up:
1. Select Basic Syntax: image
2. Select everything in the lower section and paste the following:

Function mod43calc (dataIn As String) As String
dim intSum As Number
dim intRemainder as Number
dim stringOfCharacters as String
dim i as Number

'set characters in a string (array of characters) whose index matches values of the respective character
stringOfCharacters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%"

'Declare variables
intSum = 0
intRemainder = 0

For i = 1 To Len(dataIn)
'sum up all the individual characters' values by index (which corresponds to set character values)
intSum = intSum + (InStr(stringOfCharacters, Mid(dataIn, i, 1)) - 1)
Next i

'get the remainder by dividing by 43
intRemainder = intSum Mod 43

'get/return character for the value of the remainder - this is the mod43 check digit
mod43calc = Mid(stringOfCharacters, (intRemainder + 1), 1)
End Function

3. Press Save

II. View Function:
You will now see the function in both the Functions Tree and the Report Custom Functions:
image

III. Use Function:
Now the function is a Custom Function (also known as a Report Custom Function). It is now available in the report itself and able to be concatenated with other data/functions in a formula field:

dim fieldText as string
fieldText = "ABC123"
formula = cstr (fieldText + mod43calc (fieldText))



2. Mod 10:
• Open the Formula Workshop: In the top bar, choose Report > Formula Workshop
• In the Formula Workshop, choose the ‘white paper icon’ image > Custom Function > enter in the name mod10calc and choose the Use Editor button.

When the window pops up:
1. Select Basic Syntax: image
2. Select everything in the lower section and paste the following:

Function mod10calc (DataToEncode as string) as string
dim Factor as number
dim WeightedTotal as number
dim I as number
dim CurrentCharNum as number
Factor = 3
WeightedTotal = 0
For I = Len(DataToEncode) To 1 Step -1
CurrentCharNum = tonumber(Mid(DataToEncode, I, 1))
WeightedTotal = WeightedTotal + ((CurrentCharNum) * Factor)
Factor = 4 - Factor
Next I
I = (WeightedTotal Mod 10)
If I <> 0 Then
mod10calc = totext(10 - I,0,"")
Else
mod10calc = totext(0,0,"")
End If
end function

3. Press Save

II. View Function:
You will now see the function in both the Functions Tree and the Report Custom Functions:
image
III. Use Function:
Now the function is a Custom Function (also known as a Report Custom Function). It is now available in the report itself and able to be concatenated with other data/functions in a formula field:

dim fieldText as string
fieldText = "00811410010000010"
formula = cstr (fieldText + mod10calc (fieldText))


OR


Dim DataToEncode As String
Dim tempString as String
tempString = "00811410010000010"
DataToEncode = "Ê" & "00" & tempString & mod10calc(tempString)



Support Note: There is an example report available showing the implementation.

Posted 7.8 year(s) ago

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