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#1 Posted : Tuesday, September 12, 2017 8:46:37 AM(UTC)

Nick  
Nick

Groups: Registered, Tech Support, Administrators
Posts: 46


Typically, Barcodes are used to encode ASCII information. However, binary data can also be encoded by using the SetData() and GetData() methods.

https://www.leadtools.com/help/leadtools/v19m/dh/ba/barcodedata-setdata.html
https://www.leadtools.com/help/leadtools/v19m/dh/ba/barcodedata-getdata.html

The following code snippet shows how to load an image, save it into a byte array, then encode the byte array into a QR code.

Code:

      private static void WriteBarcodeToImage(string inputFile, string outputBarcode)
      {
         // load the input image and save it to a memory streasm
         RasterCodecs codecs = new RasterCodecs();
         RasterImage input = codecs.Load(inputFile);
         MemoryStream ms = new MemoryStream();
         codecs.Save(input, ms, input.OriginalFormat, input.BitsPerPixel);

         // use SetData() to specify what data to encode in the barcode
         QRBarcodeData qrd = new QRBarcodeData();
         qrd.Symbology = BarcodeSymbology.QR;
         qrd.SetData(ms.ToArray());

         // create a new rasterimage to hold the generated barcode
         RasterImage barcode = RasterImage.Create(1000, 1000, 1, 150, RasterColor.White);

         // write the barcode to the rasterimage and save it to disk
         BarcodeEngine engine = new BarcodeEngine();
         engine.Writer.WriteBarcode(barcode, qrd, null);
         codecs.Save(barcode, outputBarcode, input.OriginalFormat, 0);
         codecs.Dispose();
      }


The process can be reversed to retrieve the original information.

Code:

      private static RasterImage ReadImageFromBarcode(RasterImage barcode)
      {
         RasterCodecs codecs = new RasterCodecs();
         BarcodeEngine engine = new BarcodeEngine();

         // read the binary data in the barcode
         BarcodeData readBarcode = engine.Reader.ReadBarcodes(barcode, LogicalRectangle.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.QR })[0];

         // pack the binary data into a memorystream, then load as an image
         MemoryStream outStream = new MemoryStream(readBarcode.GetData());
         RasterImage decodedImage = codecs.Load(outStream);

         return decodedImage;
      }


Note that barcodes have a finite upper limit of data which can be encoded dependent on symbology. Attempting to encode more binary data than a barcode symbology can support will cause an exception your application will need to handle. I've attached both the input image and the generated barcode.

input-rgby.pngimage-bc.png
Nick Crook
Developer Support Engineer
LEAD Technologies, Inc.
nick@leadtools.com
www.LEADTOOLS.com
 

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