ReadBarcodes(RasterImage,LeadRect,Int32,BarcodeSymbology[],IBarcodeReadOptions[]) Method

public BarcodeData[] ReadBarcodes( 
   RasterImage image,
   LeadRect searchBounds,
   int maximumBarcodes,
   BarcodeSymbology[] symbologies,
   IBarcodeReadOptions[] options
)

// This class holds the data we will pass to each thread
public class MyThreadData
{
   // This worker thread name
   public string Name;
   // Barcode reader instance
   public BarcodeReader BarcodeReaderInstance;

   // Array of options to use
   public IBarcodeReadOptions[] ReadOptions;

   // Image file containing the barcodes
   public string ImageFileName;

   // This will hold the barcodes found
   public BarcodeData[] Barcodes;

   // In case of errors
   public Exception Error;

   // RasterImage for ImageFileName
   public RasterImage Image;
}

[TestMethod]
public async Task BarcodeReader_ReadBarcodeExample6()
{
   string originalImageFileName = @"Assets\Barcode1.tif";
   string rotatedImageFileName = @"Barcode1_Rotated90.tif";

   string[] imageFileNames = 
   {
      originalImageFileName,
      rotatedImageFileName
   };

   // Create a 90 degrees rotated version of Barcode1.tif
   StorageFile loadFile = null;
   using (RasterCodecs codecs = new RasterCodecs())
   {
      loadFile = await Tools.AppInstallFolder.GetFileAsync(originalImageFileName);
      using (RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile)))
      {
         RotateCommand rotate = new RotateCommand(90 * 100, RotateCommandFlags.Resize, RasterColorHelper.FromKnownColor(RasterKnownColor.White));
         rotate.Run(image);

         StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(rotatedImageFileName);
         await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), RasterImageFormat.CcittGroup4, 1);
      }
   }

   // Create a Barcode engine
   BarcodeEngine engine = new BarcodeEngine();

   // Get the Barcode reader instance
   BarcodeReader reader = engine.Reader;

   // Get a version of all read options that support rotated barcodes
   IBarcodeReadOptions[] verticalBarcodeReadOptions = GetVerticalReadBarcodeOptions(reader);

   // Tasks to wait for
   Task[] finishedTasks = new Task[2];

   // Create the thread data objects
   MyThreadData[] threadsData = new MyThreadData[2];
   for(int i = 0; i < threadsData.Length; i++)
   {
      threadsData[i] = new MyThreadData();
      threadsData[i].BarcodeReaderInstance = reader;
      threadsData[i].ReadOptions = null;
   }

   // Setup the read options for the two threads
   using (RasterCodecs codecs = new RasterCodecs())
   {
      threadsData[0].Name = "Read Default Options Thread";
      threadsData[0].ReadOptions = null;  // Default, or horizontal
      loadFile = await Tools.AppInstallFolder.GetFileAsync(originalImageFileName);
      threadsData[0].Image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

      threadsData[1].Name = "Read Vertical Barcodes Thread";
      threadsData[1].ReadOptions = verticalBarcodeReadOptions;
      loadFile = await Tools.AppLocalFolder.GetFileAsync(rotatedImageFileName);
      threadsData[1].Image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));
   }

   List<BarcodeData> totalBarcodes = new List<BarcodeData>();

   // Now loop through all the images and try to read the barcodes with both threads at the same time
   foreach(string imageFileName in imageFileNames)
   {
      Debug.WriteLine("Reading barcodes from {0}", imageFileName);

      for(int i = 0; i < 2; i++)
      {
         // Clear the previous results (if any), set up the file name and run
         threadsData[i].Barcodes = null;
         threadsData[i].Error = null;
         threadsData[i].ImageFileName = imageFileName;
         finishedTasks[i] = Task.Factory.StartNew(ReadBarcodesInThread, threadsData[i]);
      }

      // Wait till all the tasks finishes
      Task.WaitAll(finishedTasks);

      // Add the barcodes found to our list
      for (int i = 0; i < 2; i++)
      {
         if (threadsData[i].Error != null)
         {
            Debug.WriteLine("{0} had error {1}", threadsData[i].Name, threadsData[i].Error);
         }
         else if (threadsData[i].Barcodes != null)
         {
            totalBarcodes.AddRange(threadsData[i].Barcodes);
         }
      }
   }

   // We are done, show the total number of barcodes read
   Debug.WriteLine("Done. Total barcodes read: {0}", totalBarcodes.Count);
}

private void ReadBarcodesInThread(object state)
{
   MyThreadData threadData = state as MyThreadData;

   Debug.WriteLine("{0} is reading the barcodes", threadData.Name);

   try
   {
      // Read the barcodes using our options
      BarcodeSymbology[] symbologies = { BarcodeSymbology.Unknown };
      threadData.Barcodes = threadData.BarcodeReaderInstance.ReadBarcodes(threadData.Image, LeadRectHelper.Empty, 0, symbologies, null);

      Debug.WriteLine("{0} has read {1} barcodes", threadData.Name, threadData.Barcodes.Length);
   }
   catch (Exception ex)
   {
      // Return the error to main
      threadData.Error = ex;
   }
   finally
   {
   }
}

private static IBarcodeReadOptions[] GetVerticalReadBarcodeOptions(BarcodeReader reader)
{
   // By default, the options read horizontal barcodes only, create an array of options capable of reading vertical barcodes

   // Notice, we cloned the default options in reader so we will not change the original options

   OneDBarcodeReadOptions oneDReadOptions = reader.GetDefaultOptions(BarcodeSymbology.UPCA).Clone() as OneDBarcodeReadOptions;
   oneDReadOptions.SearchDirection = BarcodeSearchDirection.Vertical;

   FourStateBarcodeReadOptions fourStateReadOptions = reader.GetDefaultOptions(BarcodeSymbology.USPS4State).Clone() as FourStateBarcodeReadOptions;
   fourStateReadOptions.SearchDirection = BarcodeSearchDirection.Vertical;

   PostNetPlanetBarcodeReadOptions postNetPlanetReadOptions = reader.GetDefaultOptions(BarcodeSymbology.PostNet).Clone() as PostNetPlanetBarcodeReadOptions;
   postNetPlanetReadOptions.SearchDirection = BarcodeSearchDirection.Vertical;

   GS1DatabarStackedBarcodeReadOptions gs1StackedReadOptions = reader.GetDefaultOptions(BarcodeSymbology.GS1DatabarStacked).Clone() as GS1DatabarStackedBarcodeReadOptions;
   gs1StackedReadOptions.SearchDirection = BarcodeSearchDirection.Vertical;

   PatchCodeBarcodeReadOptions patchCodeReadOptions = reader.GetDefaultOptions(BarcodeSymbology.PatchCode).Clone() as PatchCodeBarcodeReadOptions;
   patchCodeReadOptions.SearchDirection = BarcodeSearchDirection.Vertical;

   PDF417BarcodeReadOptions pdf417ReadOptions = reader.GetDefaultOptions(BarcodeSymbology.PDF417).Clone() as PDF417BarcodeReadOptions;
   pdf417ReadOptions.SearchDirection = BarcodeSearchDirection.Vertical;

   MicroPDF417BarcodeReadOptions microPdf417ReadOptions = reader.GetDefaultOptions(BarcodeSymbology.MicroPDF417).Clone() as MicroPDF417BarcodeReadOptions;
   microPdf417ReadOptions.SearchDirection = BarcodeSearchDirection.Vertical;

   // Even though this array will not contain all options, it should be enough to read all barcodes, since the version of ReadBarcodes we will use
   // will use the default options if an overriden is not passed
   IBarcodeReadOptions[] readOptions =
   {
      oneDReadOptions, fourStateReadOptions, postNetPlanetReadOptions, gs1StackedReadOptions, patchCodeReadOptions, pdf417ReadOptions, microPdf417ReadOptions
   };

   return readOptions;
}