QRBarcodeECCLevel Enumeration

Summary

Specifies the QR symbol ECC level.

Syntax

Objective-C

C++/CLI

Java

Python

[SerializableAttribute()] 
public enum QRBarcodeECCLevel

typedef NS_ENUM(NSInteger, LTQRBarcodeECCLevel) { 
 LTQRBarcodeECCLevelLevelL,  
 LTQRBarcodeECCLevelLevelM,  
 LTQRBarcodeECCLevelLevelQ,  
 LTQRBarcodeECCLevelLevelH 
};

public enum QRBarcodeECCLevel

[SerializableAttribute()] 
public enum class QRBarcodeECCLevel

class QRBarcodeECCLevel(Enum): 
   LevelL = 0 
   LevelM = 1 
   LevelQ = 2 
   LevelH = 3

Members

Value	Member	Description
0	LevelL	QR Level L - Lowest reliability
1	LevelM	QR Level M - Standard reliability
2	LevelQ	QR Level Q - High reliability
3	LevelH	QR Level H - Maximum reliability

Remarks

Used as the type for the QRBarcodeWriteOptions.ECCLevel property to specify the QR barcode ECC (Error Correction) level.

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Barcode; 
using Leadtools.ImageProcessing; 
 
 
public void QRBarcode_Example() 
{ 
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyQRBarcodes.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 QR barcodes 
      WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model1AutoSize, "QR Data 1", false); 
      WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model2Version30, "QR Data 2", true); 
 
      // 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 QR barcodes 
         ReadBarcodes(engine.Reader, image); 
      } 
   } 
} 
 
private void WriteBarcode(BarcodeWriter writer, RasterImage image, QRBarcodeSymbolModel symbolModel, string value, bool topLeft) 
{ 
   // Create the barcode data 
   QRBarcodeData barcode = BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.QR) as QRBarcodeData; 
   barcode.SymbolModel = symbolModel; 
   barcode.Value = value; 
   barcode.Symbology = BarcodeSymbology.QR; 
 
   // We will use the alignment to position the barcodes, so use all of the image 
   barcode.Bounds = new LeadRect(0, 0, image.ImageWidth, image.ImageHeight); 
 
   // Set the write options 
   QRBarcodeWriteOptions options = new QRBarcodeWriteOptions(); 
 
   if (topLeft) 
   { 
      options.HorizontalAlignment = BarcodeAlignment.Near; 
      options.VerticalAlignment = BarcodeAlignment.Near; 
   } 
   else 
   { 
      options.HorizontalAlignment = BarcodeAlignment.Far; 
      options.VerticalAlignment = BarcodeAlignment.Far; 
   } 
 
   options.GroupNumber = 0; 
   options.GroupTotal = 0; 
   options.XModule = 30; 
   options.ECCLevel = QRBarcodeECCLevel.LevelL; 
 
   // 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 
   QRBarcodeReadOptions options = new QRBarcodeReadOptions(); 
   options.EnableDoublePass = false; 
   options.EnableDoublePassIfSuccess = true; 
   options.EnablePreprocessing = true; 
 
   Console.WriteLine("Reading QR barcodes"); 
   BarcodeData[] barcodes = reader.ReadBarcodes(image, LeadRect.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.QR }, new BarcodeReadOptions[] { options }); 
   Console.WriteLine("{0} barcodes found:", barcodes.Length); 
   foreach (QRBarcodeData barcode in barcodes) 
   { 
      string value = BarcodeData.ParseECIData(barcode.GetData()); 
      if (string.IsNullOrEmpty(value)) 
         value = barcode.Value; 
 
      Console.WriteLine(" At {0}, symbol model: {1} data: {2} and symbology: {3}", barcode.Bounds, barcode.SymbolModel, value, barcode.Symbology); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.IOException; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.barcode.*; 
import leadtools.codecs.*; 
 
 
public void qrBarcodeExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   String imageFileName = combine(LEAD_VARS_IMAGES_DIR, "QRBarcodes.tif"); 
   RasterCodecs codecs = new RasterCodecs(); 
   BarcodeEngine engine = new BarcodeEngine(); 
 
   // Create the image to write the barcodes to 
   int resolution = 300; 
   RasterImage image = RasterImage.create((int) (8.5 * resolution), (int) (11.0 * resolution), 1, resolution, 
         RasterColor.fromKnownColor(RasterKnownColor.WHITE)); 
 
   // Write two QR barcodes 
   writeBarcode(engine.getWriter(), image, QRBarcodeSymbolModel.MODEL1_AUTOSIZE, "QR Data 1", false); 
   writeBarcode(engine.getWriter(), image, QRBarcodeSymbolModel.MODEL2_VERSION30, "QR Data 2", true); 
 
   // Save the image 
   codecs.save(image, imageFileName, RasterImageFormat.CCITT_GROUP4, 1); 
 
   // Now read the barcodes again 
   image = codecs.load(imageFileName); 
 
   // Read all the QR barcodes 
   readBarcodes(engine.getReader(), image); 
 
   // Clean up 
   image.dispose(); 
   codecs.dispose(); 
 
   assertTrue("file unsuccessfully saved to " + imageFileName, (new File(imageFileName)).exists()); 
   System.out.printf("File saved successfully to %s%n", imageFileName); 
} 
 
// Create the barcode data 
private void writeBarcode(BarcodeWriter writer, RasterImage image, QRBarcodeSymbolModel symbolModel, String value, boolean topLeft) { 
   QRBarcodeData barcode = (QRBarcodeData) BarcodeData.createDefaultBarcodeData(BarcodeSymbology.QR); 
   barcode.setSymbolModel(symbolModel); 
   barcode.setValue(value); 
   barcode.setSymbology(BarcodeSymbology.QR); 
 
   // We will use the alignment to position the barcodes, so use all of the image 
   barcode.setBounds(new LeadRect(0, 0, image.getImageWidth(), image.getImageHeight())); 
 
   // Set the write options 
   QRBarcodeWriteOptions options = new QRBarcodeWriteOptions(); 
 
   if (topLeft) { 
      options.setHorizontalAlignment(BarcodeAlignment.NEAR); 
      options.setVerticalAlignment(BarcodeAlignment.NEAR); 
   } else { 
      options.setHorizontalAlignment(BarcodeAlignment.FAR); 
      options.setVerticalAlignment(BarcodeAlignment.FAR); 
   } 
 
   options.setGroupNumber(0); 
   options.setGroupTotal(0); 
   options.setXModule(30); 
   options.setECCLevel(QRBarcodeECCLevel.LEVEL_L); 
 
   // Write it 
   System.out.printf("Writing barcode with symbol model: %1s and Data: %2s %n", symbolModel, value); 
   writer.writeBarcode(image, barcode, options); 
} 
 
// Setup read options 
private void readBarcodes(BarcodeReader reader, RasterImage image) { 
   QRBarcodeReadOptions options = new QRBarcodeReadOptions(); 
   options.setEnableDoublePass(false); 
   options.setEnableDoublePassIfSuccess(true); 
   options.setEnablePreprocessing(true); 
 
   System.out.println("Reading QR barcodes"); 
   BarcodeData[] barcodes = reader.readBarcodes(image, LeadRect.getEmpty(), 0, 
         new BarcodeSymbology[] { BarcodeSymbology.QR }, new BarcodeReadOptions[] { options }); 
   System.out.printf("%s barcodes found: %n", barcodes.length); 
 
   for (BarcodeData barcode : barcodes) { 
      String value = BarcodeData.parseECIData(barcode.getData()); 
      if (value == null) 
         value = barcode.getValue(); 
 
      System.out.printf(" At %1s, symbol model: %2s data: %3s and symbology: %4s %n", barcode.getBounds(), 
            barcode.getData(), value, barcode.getSymbology()); 
   } 
}

Requirements

Target Platforms

Reference

Leadtools.Barcode Namespace

QR Barcodes In LEADTOOLS

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Help Version 23.0.2024.2.29

Leadtools.Barcode Assembly

Introduction

Getting Started

Namespaces

Leadtools.Barcode Namespace

Assemblies