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SearchDirection Property

Gets or sets a value that indicates the direction to use when searching for barcodes.
public BarcodeSearchDirection SearchDirection { get; set; } 
@property (nonatomic, assign) LTBarcodeSearchDirection searchDirection; 
public BarcodeSearchDirection getSearchDirection() 
public void setSearchDirection(BarcodeSearchDirection value) 
property BarcodeSearchDirection SearchDirection { 
   BarcodeSearchDirection get(); 
   void set (    BarcodeSearchDirection ); 
SearchDirection # get and set (PatchCodeBarcodeReadOptions) 

Property Value

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


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

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Barcode; 
using Leadtools.ImageProcessing; 
public void PatchCodeBarcode_Example() 
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyPatchCodeBarcode.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 PatchCode barcodes 
      WriteBarcode(engine.Writer, image, "1100"); 
      // 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 PatchCode barcode 
         ReadBarcode(engine.Reader, image); 
private void WriteBarcode(BarcodeWriter writer, RasterImage image, string value) 
   // Create the barcode data 
   BarcodeData barcode = new BarcodeData(BarcodeSymbology.PatchCode, value); 
   // Set the write options 
   PatchCodeBarcodeWriteOptions options = new PatchCodeBarcodeWriteOptions(); 
   // Use X Module when writing the barcode 
   options.UseXModule = true; 
   options.XModule = 30; 
   // Usually PatchCodes are centered in the middle of the page and take the whole height 
   // Calculate its size 
   writer.CalculateBarcodeDataBounds(new LeadRect(0, 0, image.ImageWidth, image.ImageHeight), image.XResolution, image.YResolution, barcode, options); 
   // Position it 
   LeadRect pixels = barcode.Bounds; 
   pixels.X = (image.ImageWidth - pixels.Width) / 2; 
   pixels.Y = 0; 
   pixels.Height = image.ImageHeight; 
   barcode.Bounds = new LeadRect(); 
   // Write it 
   Console.WriteLine("Writing barcode with Data: {0}", value); 
   writer.WriteBarcode(image, barcode, options); 
private void ReadBarcode(BarcodeReader reader, RasterImage image) 
   // Setup read options 
   PatchCodeBarcodeReadOptions options = new PatchCodeBarcodeReadOptions(); 
   options.SearchDirection = BarcodeSearchDirection.Horizontal; 
   options.Granularity = 9; 
   Console.WriteLine("Reading PatchCode barcode"); 
   BarcodeData barcode = reader.ReadBarcode(image, LeadRect.Empty, BarcodeSymbology.PatchCode, options); 
   if (barcode != null) 
      Console.WriteLine(" At {0}, data: {1}", barcode.Bounds, barcode.Value); 
      Console.WriteLine(" Not found"); 
static class LEAD_VARS 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 

Target Platforms

Help Version 22.0.2023.5.9
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.Barcode Assembly

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.