Scan Add-On/Extension Codes
Add-on codes are only supported in BarcodeCapture.
The Scandit Data Capture SDK supports add-on codes (also known as Extension Codes) for EAN-8, EAN-13, UPC-A and UPC-E codes. These codes encode additional product data like an issue number, date or price. There is a two and a five digit version. This guide will show you how to enable and read out add-on codes.
Before you start…
To get the most out of this guide, we recommend that you have read the following articles:
Enabling Add-On Codes
Add-ons are handled through symbology extensions. To scan add-on codes:
Enable the main symbologies that should be scanned (EAN-8, EAN-13, UPC-A and UPC-E).
For each main symbology enable the wanted add-on symbology extension(s). The two add-on extensions are:
The following lines of code show you how this is done to enable the two digit add-on for EAN-13, UPC-A and the five digit add-on for EAN-8 while UPC-E is not expecting any add-ons:
BarcodeCaptureSettings settings = BarcodeCaptureSettings.Create();
SymbologySettings ean13upcaSettings = settings.GetSymbologySettings(Symbology.Ean13Upca);
ean13upcaSettings.Enabled = true;
SymbologySettings ean8Settings = settings.GetSymbologySettings(Symbology.Ean8);
ean8Settings.Enabled = true;
Enabling add-on codes will slow down the recognition of non-add-on codes slightly because the Scandit Data Capture SDK needs to make absolutely sure that no add-on code was missed. If you are not expecting add-on codes for a certain symbology then don’t enable them.
Reading Add-On Code Data
When add-on codes are enabled the Scandit Data Capture SDK automatically couples the add-ons to the main code and returns the add-on’s data through Barcode.AddOnData. There are two potential cases when a barcode of a symbology with enabled add-on extension is returned:
The barcode has an add-on and is returned with add-on data
The barcode does not have an add-on and is returned without add-on data
Inside IBarcodeCaptureListener.OnBarcodeScanned() the data can be retrieved from the recognized barcode as follows:
Barcode barcode = session.NewlyRecognizedBarcodes;
string data = barcode.Data;
string addOnData = barcode.AddOnData;
// Do something with the data & addOnData.
// Do something with just the data.
Avoiding the Scanning of Barcodes without Add-On
For a use-case where only barcodes with add-ons should be scanned, the same type of rejection as shown in the Barcode Capture Reject Sample can be used.
If add-on data is available:
Manually emit feedback
Change the overlay’s brush to the default
If no add-on data is available:
Don’t emit any feedback
Change the overlay’s brush to transparent