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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 (FourStateBarcodeReadOptions) 

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). You must then parse the data and extract error check digit from the rest of the data based on the barcode symbology standard.

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); 
      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.