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ReturnCheckDigit Property

Gets or sets a value that indicates whether the error check digit is returned as part of the barcode data.
public BarcodeReturnCheckDigit ReturnCheckDigit { get; set; } 
@property (nonatomic, assign) LTBarcodeReturnCheckDigit returnCheckDigit; 
public BarcodeReturnCheckDigit getReturnCheckDigit() 
public void setReturnCheckDigit(BarcodeReturnCheckDigit value) 
property BarcodeReturnCheckDigit ReturnCheckDigit { 
   BarcodeReturnCheckDigit get(); 
   void set (    BarcodeReturnCheckDigit ); 
ReturnCheckDigit # get and set (OneDBarcodeReadOptions) 

Property Value

Value indicating whether the error check digit is returned as part of the barcode data. The default value is Default.


If you set the value of ReturnCheckDigit to Yes, then this digit is returned as part of barcode data (can be retrieved with BarcodeData.GetData or BarcodeData.Value). Then parse the data and extract the error check digit from the rest of the data based on the barcode symbology standard.

1D Barcodes and Use of Check Digit

Due to the variable length of 1D barcodes and the check digit element being optional, let the BarcodeReader engine know that the last element is part of the barcode data or a check digit element by setting EnableErrorCheck to True. Then the check digit will be returned or skipped based on the value of the ReturnCheckDigit option.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Barcode; 
using Leadtools.ImageProcessing; 
public void OneDBarcode_Example() 
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyOneDBarcodes.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 POSTNET and a PLANET barcodes 
      WriteBarcode(engine.Writer, image, BarcodeSymbology.UPCA, "01234567890", new LeadRect(10, 100, 400, 200)); 
      WriteBarcode(engine.Writer, image, BarcodeSymbology.Code128, "Code 128", new LeadRect(10, 400, 400, 200)); 
      WriteBarcode(engine.Writer, image, BarcodeSymbology.Code11, "124578", new LeadRect(10, 700, 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 UPC-A barcode 
         ReadBarcodes(engine.Reader, image, BarcodeSymbology.UPCA); 
         // Read the Code 128 barcode 
         ReadBarcodes(engine.Reader, image, BarcodeSymbology.Code128); 
         // Read the Code 11 barcode 
         ReadBarcodes(engine.Reader, image, BarcodeSymbology.Code11); 
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 
   OneDBarcodeWriteOptions options = new OneDBarcodeWriteOptions(); 
   options.TextPosition = BarcodeOutputTextPosition.Default; 
   options.UseXModule = false; 
   options.XModule = 30; 
   options.EnableErrorCheck = false; 
   options.SetGS1DatabarLinkageBit = false; 
   options.WriteTruncatedGS1Databar = false; 
   options.Code128TableEncoding = Code128BarcodeTableEncoding.Auto; 
   options.Code11CheckDigitType = Code11BarcodeCheckDigitType.CDigit; 
   options.MSIModuloType = MSIBarcodeModuloType.Modulo10; 
   // 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 
   OneDBarcodeReadOptions options = new OneDBarcodeReadOptions(); 
   options.SearchDirection = BarcodeSearchDirection.Horizontal; 
   options.EnableFastMode = true; 
   options.Granularity = 9; 
   options.MinimumStringLength = 3; 
   options.MaximumStringLength = 0; 
   options.WhiteLinesNumber = 3; 
   options.ReturnCheckDigit = BarcodeReturnCheckDigit.Default; 
   options.EnableErrorCheck = false; 
   options.AvoidCorruptedBlocks = false; 
   options.AllowPartialRead = false; 
   options.Code11CheckDigitType = Code11BarcodeCheckDigitType.CDigit; 
   options.MSIModuloType = MSIBarcodeModuloType.Modulo10; 
   options.CalculateBarWidthReduction = true; 
   options.Code39Extended = false; 
   options.EnableDoublePass = false; 
   options.EnablePreprocessing = false; 
   options.ResizeSmall1D = false; 
   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); 
      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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Leadtools.Barcode Assembly

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