DatamatrixBarcodeReadOptions Class

Summary

Contains the extra options to use when reading Datamatrix barcodes.

Syntax

Objective-C

C++/CLI

Java

Python

[SerializableAttribute()] 
public class DatamatrixBarcodeReadOptions : BarcodeReadOptions

@interface LTDatamatrixBarcodeReadOptions : LTBarcodeReadOptions

public class DatamatrixBarcodeReadOptions extends BarcodeReadOptions

[TypeConverterAttribute()] 
[SerializableAttribute()] 
public ref class DatamatrixBarcodeReadOptions : public BarcodeReadOptions, System.ICloneable

class DatamatrixBarcodeReadOptions(BarcodeReadOptions):

Remarks

The DatamatrixBarcodeReadOptions class is used to control the options when reading Datamatrix barcodes using LEADTOOLS. Set the options in two ways:

The BarcodeReader class contains default options for each barcode symbology (or group of common symbologies). These options can be retrieved using the BarcodeReader.GetDefaultOptions method passing BarcodeSymbology.Datamatrix. Then change the members of the returned DatamatrixBarcodeReadOptions by casting it from BarcodeReadOptions to DatamatrixBarcodeReadOptions.

It is also possible to create an instance of the DatamatrixBarcodeReadOptions class and use it directly in BarcodeReader.ReadBarcode and BarcodeReader.ReadBarcodes methods that accept a single or array of options as an input parameter.

The base BarcodeReadOptions contains the following members and features:

Member	Description
BarcodeReadOptions.ForeColor	Controls the barcode foreground color (color of the bars or symbols) to use when reading a barcode from a colored image.
BarcodeReadOptions.BackColor	Controls the barcode background color (color of the spaces) to use when reading a barcode from a colored image.
BarcodeReadOptions.Load and BarcodeReadOptions.Save	Can be used to save or load the options to/from an XML file or stream.
BarcodeReadOptions.GetSupportedSymbologies	This class overrides the base class method to return an array containing the following symbologies: BarcodeSymbology.Datamatrix

In addition to these features and members, DatamatrixBarcodeReadOptions contains these Datamatrix barcodes specific features:

Member	Description
EnableDoublePass	Enable internal auto preprocessing of the image data if no Datamatrix barcode was found
EnableDoublePassIfSuccess	Enable internal auto preprocessing of the image data even if some Datamatrix barcodes were found
EnablePreprocessing	Enable applying auto segmentation and deep auto pre-processing to the image then re-scanning if no barcodes of this symbology are found.
EnableInvertedSymbols	Forces the Datamatrix reader to search for both inverted and normal (non-inverted) symbols
EnableFastMode	Fast barcode reading (recommended). It is suitable for most barcode qualities either good or poor
ReadSquareSymbolsOnly	Enable reading square symbols only. Otherwise, read rectangular and square symbols
EnableSmallSymbols	Enables reading small symbols that are 20 to 40 pixels
GS1toHRI	Forces the Datamatrix reader to search for both inverted and normal (non-inverted) symbols

Example

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; 
   } 
   else 
   { 
      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"; 
}