SearchDirection Property

Summary

Gets or sets a value that indicates the direction to use when searching for barcodes.

Syntax

Objective-C

C++/CLI

Java

Python

public BarcodeSearchDirection SearchDirection { get; set; }

@property (nonatomic, assign) LTBarcodeSearchDirection searchDirection;

public BarcodeSearchDirection getSearchDirection() 
public void setSearchDirection(BarcodeSearchDirection value)

public: 
property BarcodeSearchDirection SearchDirection { 
   BarcodeSearchDirection get(); 
   void set (    BarcodeSearchDirection ); 
}

SearchDirection # get and set (FourStateBarcodeReadOptions)

Property Value

A BarcodeSearchDirection enumeration member that indicates the direction to use when searching for barcodes. The default value is BarcodeSearchDirection.Horizontal.

Remarks

The BarcodeReader class can search for barcodes in the image, horizontally or vertically. By default, the reader will only search for barcodes horizontally as it has performance advantages. Alter this by changing the appropriate read barcode options to specify vertical or both (horizontal and vertical) search direction.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Barcode; 
using Leadtools.ImageProcessing; 
 
 
public void FourStateBarcode_Example() 
{ 
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyFourStateBarcodes.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 a few Four-State barcodes, a USPS, Royal Mail and Australian Post 
      WriteBarcode(engine.Writer, image, BarcodeSymbology.USPS4State, "0123456709498765432101234567891", new LeadRect(10, 100, 400, 200)); 
      WriteBarcode(engine.Writer, image, BarcodeSymbology.RoyalMail4State, "123456789", new LeadRect(10, 500, 400, 200)); 
      WriteBarcode(engine.Writer, image, BarcodeSymbology.AustralianPost4State, "11-12345678", new LeadRect(10, 900, 400, 200)); 
 
      // 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 the USPS barcode 
         ReadBarcodes(engine.Reader, image, BarcodeSymbology.USPS4State); 
 
         // Read the Royal Mail barcode 
         ReadBarcodes(engine.Reader, image, BarcodeSymbology.RoyalMail4State); 
 
         // Read the Australian Post barcode 
         ReadBarcodes(engine.Reader, image, BarcodeSymbology.AustralianPost4State); 
      } 
   } 
} 
 
private void WriteBarcode(BarcodeWriter writer, RasterImage image, BarcodeSymbology symbology, string value, LeadRect bounds) 
{ 
   // Create the barcode data 
   BarcodeData barcode = new BarcodeData(symbology, value); 
   barcode.Bounds = bounds; 
 
   // Set the write options 
   FourStateBarcodeWriteOptions options = new FourStateBarcodeWriteOptions(); 
   options.TextPosition = BarcodeOutputTextPosition.Default; 
   options.XModule = 30; 
   options.AustralianPostCIFEncoding = AustralianPost4StateBarcodeCIFEncoding.CTable; 
 
   // Write it 
   Console.WriteLine("Writing {0} barcode with data: {1}", symbology, value); 
   writer.WriteBarcode(image, barcode, options); 
} 
 
private void ReadBarcodes(BarcodeReader reader, RasterImage image, BarcodeSymbology symbology) 
{ 
   // Setup read options 
   FourStateBarcodeReadOptions options = new FourStateBarcodeReadOptions(); 
   options.SearchDirection = BarcodeSearchDirection.Horizontal; 
   options.Granularity = 9; 
   options.ReturnCheckDigit = BarcodeReturnCheckDigit.Default; 
   options.AustralianPostCIFEncoding = AustralianPost4StateBarcodeCIFEncoding.CTable; 
 
   Console.WriteLine("Reading {0} barcodes", symbology); 
   BarcodeData barcode = reader.ReadBarcode(image, LeadRect.Empty, symbology, options); 
   if (barcode != null) 
   { 
      Console.WriteLine(" At {0}, data: {1}", barcode.Bounds, barcode.Value); 
   } 
   else 
   { 
      Console.WriteLine(" Not found"); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

Requirements

Target Platforms

Reference

FourStateBarcodeReadOptions Class

FourStateBarcodeReadOptions Members

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Help Version 23.0.2024.2.29

Leadtools.Barcode Assembly

Introduction

Getting Started

Namespaces

Leadtools.Barcode Namespace

Assemblies