OcrProgressCallback Delegate

public delegate void OcrProgressCallback( 
   IOcrProgressData data
)

// Text writer to save the log to
private DataWriter _log;
private IRandomAccessStream _fileStream;
private IOutputStream _outputStream;
[TestMethod]
public async Task OcrProgressCallbackExample()
{
   string logFileName = @"log.txt";
   string tifFileName = @"Assets\Ocr1.tif";
   string pdfFileName = @"Ocr1.pdf";

   // Create the log text writer
   StorageFile file = await Tools.AppLocalFolder.CreateFileAsync(logFileName);
   _fileStream = await file.OpenAsync(FileAccessMode.ReadWrite);

   _outputStream = _fileStream.GetOutputStreamAt(0);
   _log = new DataWriter(_outputStream);

   // Create an instance of the engine
   IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.Advantage, false);

   // Start the engine using default parameters
   ocrEngine.Startup(null, null, String.Empty, Tools.OcrEnginePath);

   // Create an OCR document
   IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument();

   // Add this image to the document
   _log.WriteString("Adding the pages\r\n");
   _log.WriteString("********************************\r\n");

   using (RasterCodecs codecs = new RasterCodecs())
   {
      StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(tifFileName);
      using (RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile)))
         ocrDocument.Pages.AddPage(image, new OcrProgressCallback(MyOcrProgressCallback));
   }

   // Auto-recognize the zones in all the pages
   _log.WriteString("Auto-zoning\r\n");
   _log.WriteString("********************************\r\n");
   ocrDocument.Pages.AutoZone(new OcrProgressCallback(MyOcrProgressCallback));

   // Recognize it and save it as PDF
   _log.WriteString("Recognizing\r\n");
   _log.WriteString("********************************\r\n");
   ocrDocument.Pages.Recognize(new OcrProgressCallback(MyOcrProgressCallback));
   _log.WriteString("Saving to PDF\r\n");
   _log.WriteString("********************************\r\n");
   StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(pdfFileName, CreationCollisionOption.ReplaceExisting);
   await ocrDocument.SaveAsync(LeadStreamFactory.Create(saveFile), DocumentFormat.Pdf, new OcrProgressCallback(MyOcrProgressCallback));

   // Shutdown the engine
   ocrEngine.Shutdown();

   _log.WriteString("********************************\r\n");
   _log.WriteString("Complete\r\n");

   await _log.StoreAsync();
   _log.DetachStream();
   await _outputStream.FlushAsync();
   _fileStream.Dispose();
}

private void MyOcrProgressCallback(IOcrProgressData data)
{
   if(data.Percentage == 0)
      _log.WriteString("--------------------------\r\n");

   _log.WriteString(string.Format("Page:{0}({1}:{2}) {3}% Operation:{4}\r\n",
      data.CurrentPageIndex,
      data.FirstPageIndex,
      data.LastPageIndex,
      data.Percentage,
      data.Operation));
}