Codabar Barcodes

Overview

Aspose.BarCode for .NET enables generating barcode labels according to the Codabar standard that supports encoding numerical digits and six punctuation signs. The number of digits to be encoded in a barcode is unlimited. A Codabar barcode may contain four optional alphabet characters (usually, A, B, C, or D) that are used as start and stop digits. In this way, the symbology provides four types of start characters and four types of stop ones. Accordingly, for the same information to be encoded, it allows generating 16 barcodes with different service sets of start and stop characters.

Input text in Codabar barcodes has the following format:

[Start Character "A/B/C/D"] [Data Digits from the charset: "0-9" and "–$./:+"] [Stop Character "A/B/C/D"]

Start and Stop Symbols

The library allows encoding start and stop characters independently with any of four supported formats: A, B, C, or D. To set the required format, it is necessary to initiate CodabarStartSymbol and CodabarStopSymbol properties included in the Codabar group of parameters of class BarcodeParameters.
By default, start and stop characters are set to “A”.

Sample barcode labels demonstrated below have been generated with different settings for start and stop characters.

**Start and Stop Characters

A+A

B+B

C+C

D+D

The following code snippet illustrates how to set different combinations of start and stop characters in Codabar barcodes.

BarcodeGenerator gen = new BarcodeGenerator(EncodeTypes.Codabar, "-12345-");
gen.Parameters.Barcode.XDimension.Pixels = 2;
//set start A and stop A
gen.Parameters.Barcode.Codabar.CodabarStartSymbol = CodabarSymbol.A;
gen.Parameters.Barcode.Codabar.CodabarStopSymbol = CodabarSymbol.A;
gen.Save($"{path}CodabarStartAStopA.png", BarCodeImageFormat.Png);
//set start B and stop B
gen.Parameters.Barcode.Codabar.CodabarStartSymbol = CodabarSymbol.B;
gen.Parameters.Barcode.Codabar.CodabarStopSymbol = CodabarSymbol.B;
gen.Save($"{path}CodabarStartBStopB.png", BarCodeImageFormat.Png);
//set start C and stop C
gen.Parameters.Barcode.Codabar.CodabarStartSymbol = CodabarSymbol.C;
gen.Parameters.Barcode.Codabar.CodabarStopSymbol = CodabarSymbol.C;
gen.Save($"{path}CodabarStartCStopC.png", BarCodeImageFormat.Png);
//set start D and stop D
gen.Parameters.Barcode.Codabar.CodabarStartSymbol = CodabarSymbol.D;
gen.Parameters.Barcode.Codabar.CodabarStopSymbol = CodabarSymbol.D;
gen.Save($"{path}CodabarStartDStopD.png", BarCodeImageFormat.Png);

Checksum Settings

By default, the Codabar symbology does not require using an obligatory checksum; however, it supports two checksum calculation algorithms: Mod10 and Mod16 (the most widely used one). The pseudocode provided below illustrates how these two checksum standards can be implemented.

//Mod10
foreach (var value in encodedCodetext)
    checkSum = (checkSum + value) % 10;
//Mod16
foreach (var value in encodedCodetext)
    checkSum = (checkSum + value) % 16;

To enable a checksum for this barcode type, it is necessary to initialize the property IsChecksumEnabled by setting the mode EnableChecksum.Yes and define the required checksum algorithm in the CodabarChecksumMode property. By default, the Mod16 checksum is applied.

Codabar barcode images provided below have been created with different checksum calculation settings.

Checksum Calculation

Is Set to None

Is Set to Mod10

Is Set to Mod16

The following code sample explains how to enable different checksum standards (Mod10 and Mod16) for Codabar barcodes.

BarcodeGenerator gen = new BarcodeGenerator(EncodeTypes.Codabar, "-12345-");
gen.Parameters.Barcode.XDimension.Pixels = 2;
//set None checksum
gen.Parameters.Barcode.IsChecksumEnabled = EnableChecksum.Default;
gen.Save($"{path}CodabarChecksumNone.png", BarCodeImageFormat.Png);
//set Mod10 checksum
gen.Parameters.Barcode.IsChecksumEnabled = EnableChecksum.Yes;
gen.Parameters.Barcode.Codabar.CodabarChecksumMode = CodabarChecksumMode.Mod10;
gen.Save($"{path}CodabarChecksumMod10.png", BarCodeImageFormat.Png);
//set Mod16 checksum
gen.Parameters.Barcode.IsChecksumEnabled = EnableChecksum.Yes;
gen.Parameters.Barcode.Codabar.CodabarChecksumMode = CodabarChecksumMode.Mod16;
gen.Save($"{path}CodabarChecksumMod16.png", BarCodeImageFormat.Png);