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EnableDoublePassIfSuccess Property

Summary
Gets or sets a value indicating whether to enable the double pass if success setting when reading PDF417 symbols.
Syntax
C#
Objective-C
C++/CLI
Java
Python
public bool EnableDoublePassIfSuccess { get; set; } 
@property (nonatomic, assign) BOOL enableDoublePassIfSuccess; 
public boolean getEnableDoublePassIfSuccess() 
public void setEnableDoublePassIfSuccess(boolean value) 
public: 
property bool EnableDoublePassIfSuccess { 
   bool get(); 
   void set (    bool ); 
} 
EnableDoublePassIfSuccess # get and set (PDF417BarcodeReadOptions) 

Property Value

true to use double pass when reading PDF417 symbols. Otherwise, false. The default value is false.

Remarks

Performs the same job as EnableDoublePass except the second pass is mandatory, regardless of whether the required barcode was detected the first time.

Example
C#
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Barcode; 
using Leadtools.ImageProcessing; 
 
 
public void PDF417Barcode_Example() 
{ 
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyPDF417Barcodes.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 PDF417 barcodes 
      WriteBarcode(engine.Writer, image, "DATA1", 10, 10, true); 
      WriteBarcode(engine.Writer, image, "DATA2", 20, 20, false); 
 
      // 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)) 
      { 
         ReadBarcodes(engine.Reader, image); 
      } 
   } 
} 
 
private void WriteBarcode(BarcodeWriter writer, RasterImage image, string value, int rows, int columns, bool topLeft) 
{ 
   // Create the barcode data 
   PDF417BarcodeData barcode = new PDF417BarcodeData(); 
   barcode.Value = value; 
   barcode.Group = 0; 
   barcode.Symbology = BarcodeSymbology.PDF417; 
 
   // 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 
   PDF417BarcodeWriteOptions options = new PDF417BarcodeWriteOptions(); 
 
   if (topLeft) 
   { 
      options.HorizontalAlignment = BarcodeAlignment.Near; 
      options.VerticalAlignment = BarcodeAlignment.Near; 
   } 
   else 
   { 
      options.HorizontalAlignment = BarcodeAlignment.Far; 
      options.VerticalAlignment = BarcodeAlignment.Far; 
   } 
 
   options.Truncated = false; 
   options.EnableGroupMode = false; 
   options.SymbolWidthAspectRatio = 2; 
   options.SymbolHeightAspectRatio = 1; 
   options.LimitByRowsAndColumns = true; 
   options.Rows = rows; 
   options.Columns = columns; 
   options.XModule = 30; 
   options.XModuleAspectRatio = 3; 
   options.ECCLevel = PDF417BarcodeECCLevel.Level0; 
   options.ECCPercentage = 0; 
 
   // Write it 
   Console.WriteLine("Writing barcode with symbol rows/columns: {0}/{1} and Data: {2}", rows, columns, value); 
   writer.WriteBarcode(image, barcode, options); 
} 
 
private void ReadBarcodes(BarcodeReader reader, RasterImage image) 
{ 
   // Setup read options 
   PDF417BarcodeReadOptions options = new PDF417BarcodeReadOptions(); 
   options.SearchDirection = BarcodeSearchDirection.Horizontal; 
   options.EnableDoublePass = false; 
   options.EnableFastMode = false; 
   options.ReadMode = PDF417BarcodeReadMode.Mode0; 
   options.ReturnCorruptedSymbolArea = false; 
   options.ReadOptionalMacroFileNameField = false; 
   options.ReadOptionalMacroSegmentCountField = false; 
   options.ReadOptionalMacroTimestampField = false; 
   options.ReadOptionalMacroSenderField = false; 
   options.ReadOptionalMacroAddresseeField = false; 
   options.ReadOptionalMacroFileSizeField = false; 
   options.ReadOptionalMacroChecksumField = false; 
   options.ReadOptionalMacro79AndAZField = false; 
   options.EnableDoublePassIfSuccess = true; 
   options.EnableNoIndicatorTrail = true; 
   options.EnablePreprocessing = true; 
 
   Console.WriteLine("Reading Barcodes"); 
   BarcodeData[] barcodes = reader.ReadBarcodes(image, LeadRect.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.PDF417 }, new BarcodeReadOptions[] { options }); 
   Console.WriteLine("{0} barcodes found:", barcodes.Length); 
   foreach (PDF417BarcodeData barcode in barcodes) 
   { 
      Console.WriteLine(" At {0} data: {1} and symbology: {2}", barcode.Bounds, barcode.Value, barcode.Symbology); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
} 
Requirements

Target Platforms

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

Leadtools.Barcode Assembly

Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.