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MicroQRBarcodeData Class

Summary

Contains the data for a single MicroQR barcode.

Syntax

Java

Objective-C

C++

[SerializableAttribute()] 
public class MicroQRBarcodeData : BarcodeData

<TypeConverterAttribute()> 
<SerializableAttribute()> 
Public Class MicroQRBarcodeData  
   Inherits Leadtools.Barcode.BarcodeData 
   Implements System.ICloneable

@interface LTMicroQRBarcodeData : LTBarcodeData <NSCopying>

public class MicroQRBarcodeData extends BarcodeData

[TypeConverterAttribute()] 
[SerializableAttribute()] 
public ref class MicroQRBarcodeData : public Leadtools.Barcode.BarcodeData, System.ICloneable

Remarks

The MicroQRBarcodeData class derives from the base BarcodeData to add specific data that can be read or written when using MicroQR barcodes.

Reading Barcodes

When the BarcodeReader object detects and reads a MicroQR ( barcodesymbology.microqr), the BarcodeReader.ReadBarcode and BarcodeReader.ReadBarcodes methods will return the MicroQRBarcodeData object for each barcode cast down to the base BarcodeData class.

You can perform standard .NET casting to get the object as MicroQRBarcodeData and then examine the extra data properties associated with it.

MicroQR read options not related to the barcode data can be set using the MicroQRBarcodeReadOptions class.

Writing Barcodes

The BarcodeWriter class contains the WriteBarcode method that is used to write a barcode to an image. This method accepts the data parameter as the base BarcodeData object. To write a MicroQR barcode, create an instance of MicroQRBarcodeData and fill the required parameters, then pass this object as the data parameter to WriteBarcode.

MicroQR write options not related to the barcode data can be set using the MicroQRBarcodeWriteOptions class.

You can use the static (or Shared in VB) BarcodeData.CreateDefaultBarcodeData method to create a new instance of MicroQRBarcodeData that contains default parameters ready for writing to an image:

VB Snippet

Dim MicroQRData As MicroQRBarcodeData = DirectCast(BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.MicroQR), MicroQRBarcodeData)

C# Snippet

MicroQRBarcodeData MicroQRData = BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.MicroQR) as MicroQRBarcodeData;

Example

This example writes a couple of MicroQR barcodes with different options to an image and then reads them back.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Forms; 
using Leadtools.Barcode; 
using Leadtools.ImageProcessing; 
 
public void MicroQRBarcode_Example() 
{ 
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyMicroQRBarcodes.tif"); 
 
   BarcodeEngine engine = new BarcodeEngine(); 
 
   // Create the image to write the barcodes to 
   int resolution = 300; 
   using (RasterImage image = RasterImage.Create((int)(8.5 * resolution), (int)(11.0 * resolution), 1, resolution, RasterColor.FromKnownColor(RasterKnownColor.White))) 
   { 
      // Write two MicroQR barcodes 
      WriteBarcode(engine.Writer, image, MicroQRBarcodeSymbolModel.AutoSize, "MicroQR Data 1", 0); 
      WriteBarcode(engine.Writer, image, MicroQRBarcodeSymbolModel.MicroQRM4M, "Data", 1000); 
 
      // Save the image 
      using (RasterCodecs codecs = new RasterCodecs()) 
      { 
         codecs.Save(image, imageFileName, RasterImageFormat.CcittGroup4, 1); 
      } 
   } 
 
   // Now read the barcodes again 
   using (RasterCodecs codecs = new RasterCodecs()) 
   { 
      using (RasterImage image = codecs.Load(imageFileName)) 
      { 
         // Read all the MicroQR barcodes 
         ReadBarcodes(engine.Reader, image); 
      } 
   } 
} 
 
private void WriteBarcode(BarcodeWriter writer, RasterImage image, MicroQRBarcodeSymbolModel symbolModel, string value, int startRow) 
{ 
   // Create the barcode data 
   MicroQRBarcodeData barcode = BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.MicroQR) as MicroQRBarcodeData; 
   barcode.Value = value; 
 
   // We will use the alignment to position the barcodes, so use all of the image 
   barcode.Bounds = new LogicalRectangle(0, startRow, image.ImageWidth, image.ImageHeight, LogicalUnit.Pixel); 
 
   // Set the write options 
   MicroQRBarcodeWriteOptions options = new MicroQRBarcodeWriteOptions(); 
 
   options.XModule = 30; 
   options.SymbolModel = symbolModel; 
 
   // Write it 
   Console.WriteLine("Writing barcode with symbol model: {0} and Data: {1}", symbolModel, value); 
   writer.WriteBarcode(image, barcode, options); 
} 
 
private void ReadBarcodes(BarcodeReader reader, RasterImage image) 
{ 
   // Setup read options 
   MicroQRBarcodeReadOptions options = new MicroQRBarcodeReadOptions(); 
 
   Console.WriteLine("Reading MicroQR barcodes"); 
   BarcodeData[] barcodes = reader.ReadBarcodes(image, LogicalRectangle.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.MicroQR }, new BarcodeReadOptions[] { options }); 
   Console.WriteLine("{0} barcodes found:", barcodes.Length); 
   foreach (MicroQRBarcodeData barcode in barcodes) 
   { 
      Console.WriteLine(" At {0}, and data: {1}", barcode.Bounds, barcode.Value); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Forms 
Imports Leadtools.Barcode 
Imports Leadtools.ImageProcessing 
 
Public Sub MicroQRBarcode_Example() 
   Dim imageFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "MyMicroQRBarcodes.tif") 
 
   Dim engine As New BarcodeEngine() 
 
   ' Create the image to write the barcodes to 
   Dim resolution As Integer = 300 
   Using image As RasterImage = RasterImage.Create(CType(8.5 * resolution, Integer), CType(11.0 * resolution, Integer), 1, resolution, RasterColor.FromKnownColor(RasterKnownColor.White)) 
      ' Write two MicroQR barcodes 
      WriteBarcode(engine.Writer, image, MicroQRBarcodeSymbolModel.AutoSize, "MicroQR Data 1", False) 
      WriteBarcode(engine.Writer, image, MicroQRBarcodeSymbolModel.MicroQRM4M, "MicroQR Data 2", True) 
 
      ' Save the image 
      Using codecs As New RasterCodecs() 
         codecs.Save(image, imageFileName, RasterImageFormat.CcittGroup4, 1) 
      End Using 
   End Using 
 
   ' Now read the barcodes again 
   Using codecs As New RasterCodecs() 
      Using image As RasterImage = codecs.Load(imageFileName) 
         ' Read all the MicroQR barcodes 
         ReadBarcodes(engine.Reader, image) 
      End Using 
   End Using 
End Sub 
 
Private Sub WriteBarcode(ByVal writer As BarcodeWriter, ByVal image As RasterImage, ByVal symbolModel As MicroQRBarcodeSymbolModel, ByVal value As String, ByVal topLeft As Boolean) 
   ' Create the barcode data 
   Dim barcode As MicroQRBarcodeData = DirectCast(BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.MicroQR), MicroQRBarcodeData) 
   barcode.Value = value 
 
   ' We will use the alignment to position the barcodes, so use all of the image 
   barcode.Bounds = New LogicalRectangle(0, 0, image.ImageWidth, image.ImageHeight, LogicalUnit.Pixel) 
 
   ' Set the write options 
   Dim options As New MicroQRBarcodeWriteOptions() 
 
   options.XModule = 30 
   options.SymbolModel = symbolModel 
 
   ' Write it 
   Console.WriteLine("Writing barcode with symbol model: {0} and Data: {1}", symbolModel, value) 
   writer.WriteBarcode(image, barcode, options) 
End Sub 
 
Private Sub ReadBarcodes(ByVal reader As BarcodeReader, ByVal image As RasterImage) 
   ' Setup read options 
   Dim options As New MicroQRBarcodeReadOptions() 
 
   Console.WriteLine("Reading MicroQR barcodes") 
   Dim barcodes() As BarcodeData = reader.ReadBarcodes(image, LogicalRectangle.Empty, 0, New BarcodeSymbology() {BarcodeSymbology.MicroQR}, New BarcodeReadOptions() {options}) 
   Console.WriteLine("{0} barcodes found:", barcodes.Length) 
   For Each barcode As MicroQRBarcodeData In barcodes 
      Console.WriteLine(" At {0}, and data: {1}", barcode.Bounds, barcode.Value) 
   Next 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class

Requirements

Target Platforms

Help Version 19.0.2017.10.27

Leadtools.Barcode Assembly

Introduction

Getting Started

Namespaces

Leadtools.Barcode Namespace

Leadtools.Barcode.Deprecated Namespace

Assemblies

MicroQRBarcodeData Class

Reading Barcodes

Writing Barcodes

Reference