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EnableInvertedSymbols Property

Gets or sets a value indicating whether the Datamatrix reader will search for both inverted and normal (non-inverted) symbols.
public bool EnableInvertedSymbols { get; set; } 
@property (nonatomic, assign) BOOL enableInvertedSymbols; 
public boolean getEnableInvertedSymbols() 
public void setEnableInvertedSymbols(boolean value) 
property bool EnableInvertedSymbols { 
   bool get(); 
   void set (    bool ); 
EnableInvertedSymbols # get and set (DatamatrixBarcodeReadOptions) 

Property Value

true to force the Datamatrix engine to search for both inverted and normal (non-inverted) symbols. Otherwise, false. The default value is false.


The Datamatrix reader engine can automatically read inverted symbols. An inverted symbol is one that has white foreground color and black background for example.

Notice that the colors to search for when reading Datamatrix barcodes can be set using ForeColor and BackColor. When EnableInvertedSymbols is true, the engine will use the two colors specified and then automatically flip them and try again if it cannot find the symbol.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Barcode; 
using Leadtools.ImageProcessing; 
public void DatamatrixBarcode_Example() 
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyDatamatrixBarcodes.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 Datamatrix barcodes, a square and a rectangle one 
      WriteBarcode(engine.Writer, image, DatamatrixBarcodeSymbolSize.Size16X36, "Datamatrix1 16x36", false); 
      WriteBarcode(engine.Writer, image, DatamatrixBarcodeSymbolSize.Size132X132, "Datamatrix2 132x132", true); 
      // 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 only square symbols, should only read the first barcode 
         ReadBarcodes(engine.Reader, image, true); 
         // Read all symbols, should read both barcodes 
         ReadBarcodes(engine.Reader, image, false); 
private void WriteBarcode(BarcodeWriter writer, RasterImage image, DatamatrixBarcodeSymbolSize symbolSize, string value, bool topLeft) 
   // Create the barcode data 
   DatamatrixBarcodeData barcode = BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.Datamatrix) as DatamatrixBarcodeData; 
   barcode.SymbolSize = symbolSize; 
   barcode.Value = value; 
   barcode.Symbology= BarcodeSymbology.Datamatrix; 
   // 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 
   DatamatrixBarcodeWriteOptions options = new DatamatrixBarcodeWriteOptions(); 
   if (topLeft) 
      options.HorizontalAlignment = BarcodeAlignment.Near; 
      options.VerticalAlignment = BarcodeAlignment.Near; 
      options.HorizontalAlignment = BarcodeAlignment.Far; 
      options.VerticalAlignment = BarcodeAlignment.Far; 
   options.DisableCompression = false; 
   options.GroupNumber = 0; 
   options.GroupTotal = 0; 
   options.FileIdNumberLowByte = 1; 
   options.FileIdNumberHighByte = 1; 
   options.XModule = 30; 
   options.HRItoGS1 = false; 
   // Write it 
   Console.WriteLine("Writing barcode with symbol size: {0} and Data: {1}", symbolSize, value); 
   writer.WriteBarcode(image, barcode, options); 
private void ReadBarcodes(BarcodeReader reader, RasterImage image, bool squareOnly) 
   // Setup read options 
   DatamatrixBarcodeReadOptions options = new DatamatrixBarcodeReadOptions(); 
   options.ReadSquareSymbolsOnly = squareOnly; 
   options.EnableDoublePass = false; 
   options.EnableDoublePassIfSuccess = false; 
   options.EnableInvertedSymbols = false; 
   options.EnableFastMode = true; 
   options.EnableSmallSymbols = true; 
   options.EnablePreprocessing = true; 
   options.GS1toHRI = false; 
   Console.WriteLine("Reading Datamatrix barcodes with ReadSquareSymbolsOnly set to {0}", squareOnly); 
   BarcodeData[] barcodes = reader.ReadBarcodes(image, LeadRect.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.Datamatrix }, new BarcodeReadOptions[] { options }); 
   Console.WriteLine("{0} barcodes found:", barcodes.Length); 
   foreach (DatamatrixBarcodeData barcode in barcodes) 
      Console.WriteLine(" At {0}, symbol size: {1} data: {2} and symbology: {3}", barcode.Bounds, barcode.SymbolSize, barcode.Value, barcode.Symbology); 
static class LEAD_VARS 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 

Target Platforms

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Leadtools.Barcode Assembly

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