Generate MaxiCode Barcodes in C#

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Overview

MaxiCode is a 2D matrix barcode type that allows encoding both text information and byte streams. This symbology supports Reed-Solomon error correction. The amount of data required for error correction and barcode size are strictly specified in the MaxiCode standard. A MaxiCode barcode includes a round bullseye finder pattern composed of three concentric circles, six orientation patterns, and 33 rows with 29 or 30 hexagonal modules.

The available size of information to be encoded (data capacity) depends on the input data characteristics and constitutes at most 60 bytes or 140 numerical (90 alphanumeric) digits. This symbology has been introduced for postal services; it is intended for industrial standard support and is not recommended for business-as-usual use.

If you need any clarifications, feel free to reach out Aspose Technical Support: ask your questions at Aspose.Barcode Forum or contact Aspose Paid Support Helpdesk.

MaxiCode Mode Settings

In Aspose.BarCode for .NET, developers can set different generation modes to create MaxiCode barcodes using the MaxiCodeMode property of class MaxiCodeParameters. The following data modes are supported:

Modes 2 and 3 - special industrial standards that are used in the transportation industry to store the information about shipping along with additional data
Modes 4 and 5 - can store arbitrary text information or byte streams and differ from each other only by the number of codewords for error correction and potential data capacity
Mode 6 - is the same as Mode 4, but the barcode information is used to set up hardware readers

These modes are described further in the article. You can find more information and code samples for complex data modes here.

MaxiCode Modes 2 and 3

For correct barcode generation, MaxiCodeModes 2 and 3 require specifying the input data in the predefined formats that can be summarized as follows:

Format1: “[)>(rs)01(gs)(Postal Code)(gs)(Country Code)(gs)(Service Category)(gs)(Secondary Message)(eot)”
Format2: “(Postal Code 9 digits)(gs)(Country Code)(gs)(Service Category)(gs)(Secondary Message)(eot)”

The following special characters are used:

Group separator Unicode character: (gs) - \u001d
Record separator Unicode character: (rs) - \u001e
End-of-transmission Unicode character: (eot) - \u0004

Sample MaxiCode barcodes demonstrated below have been created using Formats 1 and 2 of MaxiCode Mode 2.

Mode 2	Format 1	Format 2

The following code snippet explains how to work with MaxiCode modes.

string gs = "\u001d";
string rs = "\u001e";
string eot = "\u0004";
//[)>(rs)01(gs)(Postal Code)(gs)(Country Code)(gs)(Service Category)(gs)(Secondary Message)(eot)
string codetext = $"[)>{rs}01{gs}B1050{gs}056{gs}001{gs}ADDITIONAL DATA{eot}";

using (BarcodeGenerator gen = new BarcodeGenerator(EncodeTypes.MaxiCode, codetext))
{
    //set MaxiCode mode to 2
    gen.Parameters.Barcode.MaxiCode.MaxiCodeMode = MaxiCodeMode.Mode2;

    gen.Parameters.Barcode.XDimension.Pixels = 15;
    gen.Parameters.Barcode.CodeTextParameters.TwoDDisplayText = "MaxiCode Mode 2";

    gen.Save($"{path}MaxiCodeMode2First.png", BarCodeImageFormat.Png);
}


//(Postal Code 9 digits)(gs)(Country Code)(gs)(Service Category)(gs)(Secondary Message)(eot)
codetext = $"123456789{gs}056{gs}001{gs}ADDITIONAL DATA{eot}";
using (BarcodeGenerator gen = new BarcodeGenerator(EncodeTypes.MaxiCode, codetext))
{
    //set MaxiCode mode to 2
    gen.Parameters.Barcode.MaxiCode.MaxiCodeMode = MaxiCodeMode.Mode2;

    gen.Parameters.Barcode.XDimension.Pixels = 15;
    gen.Parameters.Barcode.CodeTextParameters.TwoDDisplayText = "MaxiCode Mode 2";

    gen.Save($"{path}MaxiCodeMode2Second.png", BarCodeImageFormat.Png);
}

MaxiCode Modes 4, 5, and 6

MaxiCode barcodes generated in these modes can store the arbitrary text data or byte streams. The code sample given below shows how to use the MaxiCode Mode 4.

using (BarcodeGenerator gen = new BarcodeGenerator(EncodeTypes.MaxiCode, "Åspóse.Barcóde©"))
{
    gen.Parameters.Barcode.XDimension.Pixels = 15;
    //set MaxiCode encode mode to 4
    gen.Parameters.Barcode.MaxiCode.MaxiCodeMode = MaxiCodeMode.Mode4;
    gen.Save($"{path}MaxiCodeEncodeMode4.png", BarCodeImageFormat.Png);
}

Encoding Mode Settings

The barcode library supports different encoding modes to generate MaxiCode barcodes. The required mode can be selected by setting the MaxiCodeEncodeMode property of class MaxiCodeParameters. The possible values are defined in the MaxiCodeEncodeMode enumeration. These modes are briefly described below:

Auto. In Auto mode, the CodeText is encoded with maximum data compactness. This is the default value.
Binary. The Binary mode is used to encode binary data with maximum data compactness.
ECI. The Extended Channel Interpretation (ECI) mode indicates the encoded data is interpreted according to the ECI protocol defined by the AIM ECI Specifications.
Extended. The Extended mode provides flexible encoding controls and allows for manually specifying the required encoding for a part of Codetext.

Encoding Mode Auto

In Auto mode, the CodeText is encoded with maximum data compactness. Unicode characters are re-encoded using the encoding specified in the ECIEncoding parameter, with an ECI identifier inserted. If a character is found that is not supported by the selected ECI encoding, an exception is thrown. By default, the ECIEncoding property is set to ECIEncodings.UTF8 (ECI ID:"\000026”). The following code sample shows how to generate MaxiCode barcode in the Auto mode.

using (var gen = new BarcodeGenerator(EncodeTypes.MaxiCode, "犬Right狗"))
{
    gen.Save($"{path}MaxiCodeEncodyModeAuto.png", BarCodeImageFormat.Png);
}

Encoding Mode Binary

The Binary mode serves to encode byte streams. If a Unicode character is encountered, an exception is thrown. The code sample below explains how to work with this encoding mode.

byte[] encodedArr = { 0xFF, 0xFE, 0xFD, 0xFC, 0xFB, 0xFA, 0xF9 };
using (BarcodeGenerator gen = new BarcodeGenerator(EncodeTypes.MaxiCode))
{
    bg.SetCodeText(encodedArr);
    //set MaxiCode encode mode to Binary
    gen.Parameters.Barcode.MaxiCode.MaxiCodeEncodeMode = MaxiCodeEncodeMode.Binary;
    gen.Save($"{path}MaxiCodeEncodeModeBinary.png", BarCodeImageFormat.Png);

}

Encoding Mode ECI

The Extended Channel Interpretation (ECI) mode indicates that the encoded data is interpreted according to the ECI protocol defined by the AIM ECI Specifications. When the ECI mode is selected, the entire CodeText is re-encoded using the encoding specified in the ECIEncoding parameter, with an ECI identifier inserted. If a character is found that is not supported by the selected ECI encoding, an exception is thrown. By default, the ECIEncoding property is set to ECIEncodings.UTF8 (ECI ID:"\000026”).

The following code sample demonstrates how to use the ECI mode.

// ECI mode, Latin/Greek alphabet encoding. ECI ID:"\000009"
var str = "ΑΒΓΔΕ";

using (var bg = new BarcodeGenerator(EncodeTypes.MaxiCode, str))
{
    bg.Parameters.Barcode.MaxiCode.MaxiCodeEncodeMode = MaxiCodeEncodeMode.ECI;
    bg.Parameters.Barcode.MaxiCode.ECIEncoding = ECIEncodings.ISO_8859_7;
    var img = bg.GenerateBarCodeImage();
}

Encoding Mode Extended

In this mode, the information passed to the CodeText property includes control words besides the main input data. Control words serve to enable extended control over the data encoding process and allow developers to store textual sequences with different encodings in one barcode. To generate MaxiCode barcodes in this format, it is recommended to use class MaxiCodeExtCodetextBuilder.

//create codetext
MaxiCodeExtCodetextBuilder textBuilder = new MaxiCodeExtCodetextBuilder();
textBuilder.AddECICodetext(ECIEncodings.Win1251, "Will");
textBuilder.AddECICodetext(ECIEncodings.UTF8, "犬Right狗");
textBuilder.AddECICodetext(ECIEncodings.UTF16BE, "犬Power狗");
textBuilder.AddPlainCodetext("Plain text");

//generate codetext
string codetext = textBuilder.GetExtendedCodetext();

//generate
using (BarcodeGenerator gen = new BarcodeGenerator(EncodeTypes.MaxiCode, codetext))
{
    gen.Parameters.Barcode.XDimension.Pixels = 15;
    //set encode mode to Extended
    gen.Parameters.Barcode.MaxiCode.MaxiCodeEncodeMode = MaxiCodeEncodeMode.Extended;
    gen.Parameters.Barcode.CodeTextParameters.TwoDDisplayText = "Extended mode";
    gen.Save($"{path}MaxiCodeEncodeModeExtended.png", BarCodeImageFormat.Png);
}

Aspect Ratio

Aspect Ratio is the ratio between the barcode width and height. In Aspose.BarCode for .NET, developers can use the AspectRatio property of class MaxiCodeParameters to adjust barcode proportions with respect to the X and Y coordinates. It is implemented as a relative coefficient to the XDimension parameter. MaxiCode barcodes should be generated with the value of AspectRatio equal to 1. A sample MaxiCode barcode provided below has been generated using the Aspect Ratio set to 0.5.

The following code snippet illustrates how to manage Aspect Ratio settings for MaxiCode barcode generation.

BarcodeGenerator gen = new BarcodeGenerator(EncodeTypes.MaxiCode, "Åspóse.Barcóde©");
gen.Parameters.Barcode.XDimension.Pixels = 15;
//set aspect ratio 0.5
gen.Parameters.Barcode.MaxiCode.AspectRatio = 0.5f;
gen.Save($"{path}MaxiCodeAspectRatio0.5.png", BarCodeImageFormat.Png);

Structured Append

The structured append mode is a special generation regime that allows combining up to eight MaxiCode barcodes. To use this mode, it is necessary to initialize the following properties:

MaxiCodeStructuredAppendModeBarcodesCount – is used to set the number of MaxiCode barcodes to be generated (from 2 to 8)
MaxiCodeStructuredAppendModeBarcodeId – sets the position of the barcode in the sequence

using (BarcodeGenerator gen = new BarcodeGenerator(EncodeTypes.MaxiCode, "Åspóse.Barcóde©"))
{
    gen.Parameters.Barcode.XDimension.Pixels = 15;
    //set MaxiCode strucutured append mode
    gen.Parameters.Barcode.MaxiCode.MaxiCodeStructuredAppendModeBarcodeId = 3;
    gen.Parameters.Barcode.MaxiCode.MaxiCodeStructuredAppendModeBarcodeId = 5;
    gen.Save($"{path}MaxiCodeStructuredAppendMode.png", BarCodeImageFormat.Png);
}

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