Programming with LEADTOOLS .NET OCR

// Assuming you added "using Leadtools.Codecs;", "using Leadtools.Ocr;" and "using Leadtools.Document.Writer;" at the beginning of this class 
// *** Step 1: Specify the engine type and create an instance of the IOcrEngine interface. 
             
// This example will use the LEADTOOLS OCR Module - LEAD Engine and use it in the same process 
IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD); 
             
// *** Step 2: Start up the engine. 
             
// Use the default parameters 
ocrEngine.Startup(null, null, null, @"C:\LEADTOOLS22\Bin\Common\OcrLEADRuntime"); 
             
// *** Step 3: Create an OCR document with one or more pages. 
             
IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument(); 
              
// Add all the pages of a multipage TIF image to the document 
ocrDocument.Pages.AddPages(@"C:\LEADTOOLS22\Resources\Images\Ocr.tif", 1, -1, null); 
             
// *** Step 4: (Optional) Establish zones on the page(s), either manually or automatically 
             
// Automatic zoning 
ocrDocument.Pages.AutoZone(null); 
             
// *** Step 5: (Optional) Set the active languages to be used by the OCR engine 
             
// Enable both the English and German languages 
ocrEngine.LanguageManager.EnableLanguages(new string[] { "en", "de" }); 
             
// *** Step 6: (Optional) Set the spell checking engine 
             
// Enable the spell-checking system 
ocrEngine.SpellCheckManager.SpellCheckEngine = OcrSpellCheckEngine.Native; 
             
// *** Step 7: (Optional) Set any special recognition module options 
             
// Set the zoning method for the first zone in the first page to be Graphic so it will not be recognized 
OcrZone ocrZone = ocrDocument.Pages[0].Zones[0]; 
ocrZone.ZoneType = OcrZoneType.Graphic; 
ocrDocument.Pages[0].Zones[0] = ocrZone; 
             
// *** Step 8: Recognize 
             
ocrDocument.Pages.Recognize(null); 
             
// *** Step 9: Save recognition results 
             
// Save the results to a PDF file 
ocrDocument.Save(@"C:\LEADTOOLS22\Resources\Images\Document.pdf", DocumentFormat.Pdf, null); 
ocrDocument.Dispose(); 
             
// *** Step 10: Shut down the OCR engine when finished 
ocrEngine.Shutdown(); 
ocrEngine.Dispose(); 

// Create the engine instance 
using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD)) 
{ 
   // Start up the engine 
   ocrEngine.Startup(null, null, null, @"C:\LEADTOOLS22\Bin\Common\OcrLEADRuntime"); 
              
   // Load the first page as a RasterImage 
   RasterImage rasterImage = ocrEngine.RasterCodecsInstance.Load(@"C:\LEADTOOLS22\Resources\Images\Ocr.tif", 1); 
              
   // Create an OCR page from this image, transferring ownership of the RasterImage object 
   using (IOcrPage ocrPage = ocrEngine.CreatePage(rasterImage, OcrImageSharingMode.AutoDispose)) 
   { 
      // Recognize the page 
      ocrPage.Recognize(null); 
              
      // Show the text of all zones 
      for (int zoneIndex = 0; zoneIndex < ocrPage.Zones.Count; zoneIndex++) 
      { 
         string text = ocrPage.GetText(zoneIndex); 
         Console.WriteLine(text); 
      } 
   } 
              
   // The engine will automatically shut down when Dispose is called 
} 

// Create the engine instance 
using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD)) 
{ 
   // Start up the engine 
   ocrEngine.Startup(null, null, null, @"C:\LEADTOOLS22\Bin\Common\OcrLEADRuntime"); 
              
   // Create the OCR document in memory 
   using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument(null, OcrCreateDocumentOptions.InMemory)) 
   { 
      string imageFile = @"C:\LEADTOOLS22\Resources\Images\Ocr.tif"; 
             
      // Add all the pages to the document 
      ocrDocument.Pages.AddPages(imageFile, 1, -1, null); 
              
      // Recognize all the pages 
      ocrDocument.Pages.Recognize(null); 
              
      // Save the recognition results in PDF format 
      ocrDocument.Save(@"C:\LEADTOOLS22\Resources\Images\Document.pdf", DocumentFormat.Pdf, null); 
   } 
} 

// Create the engine instance 
using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD)) 
{ 
   // Start up the engine 
   ocrEngine.Startup(null, null, null, @"C:\LEADTOOLS22\Bin\Common\OcrLEADRuntime"); 
              
   // Create a file-based OCR document 
   using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument(null, OcrCreateDocumentOptions.AutoDeleteFile)) 
   { 
      string imageFile = @"C:\LEADTOOLS22\Resources\Images\Ocr.tif"; 
             
      // Get the number of pages in the document 
      int pageCount = ocrEngine.RasterCodecsInstance.GetTotalPages(imageFile); 
             
      // Create a page 
      for (int page = 1; page <= pageCount; page++) 
      { 
         // Load a RasterImage 
         RasterImage rasterImage = ocrEngine.RasterCodecsInstance.Load(imageFile, page); 
              
         // Create an OCR page from this image, transferring ownership of the RasterImage object 
         using (IOcrPage ocrPage = ocrEngine.CreatePage(rasterImage, OcrImageSharingMode.AutoDispose)) 
         { 
            // Recognize the page 
            ocrPage.Recognize(null); 
              
            // Add it to the document 
            ocrDocument.Pages.Add(ocrPage); 
              
            // Page will be disposed here and its memory freed 
         } 
      } 
              
      // Save the recognition results in PDF format 
      ocrDocument.Save(@"C:\LEADTOOLS22\Resources\Images\Document.pdf", DocumentFormat.Pdf, null); 
   } 
} 

private static void Test4() 
{ 
   // Create the engine instance 
   IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD); 
   // Start up the engine 
   ocrEngine.Startup(null, null, null, @"C:\LEADTOOLS22\Bin\Common\OcrLEADRuntime"); 
             
   string imageFile1 = @"C:\LEADTOOLS22\Resources\Images\Ocr1.tif"; 
   string imageFile2 = @"C:\LEADTOOLS22\Resources\Images\Ocr2.tif"; 
             
   // Create a file-based OCR document 
   // Pass a file name (the name will be re-used) and tell the document to not delete it 
   string documentFile = @"C:\LEADTOOLS22\Resources\Images\document.bin"; 
   using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument(documentFile, OcrCreateDocumentOptions.None)) 
   { 
      // Verify the document does not have any pages 
      System.Diagnostics.Debug.Assert(ocrDocument.Pages.Count == 0); 
             
      // Add a page 
      RasterImage rasterImage = ocrEngine.RasterCodecsInstance.Load(imageFile1, 1); 
      using (IOcrPage ocrPage = ocrEngine.CreatePage(rasterImage, OcrImageSharingMode.AutoDispose)) 
      { 
         ocrPage.Recognize(null); 
         ocrDocument.Pages.Add(ocrPage); 
      } 
             
      // Here the document is disposed but the file will not be deleted 
   } 
             
   // Re-load the document 
   using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument(documentFile, OcrCreateDocumentOptions.LoadExisting)) 
   { 
      // Verify the document has one page 
      System.Diagnostics.Debug.Assert(ocrDocument.Pages.Count == 1); 
             
      // Add another page 
      RasterImage rasterImage = ocrEngine.RasterCodecsInstance.Load(imageFile2, 1); 
      using (IOcrPage ocrPage = ocrEngine.CreatePage(rasterImage, OcrImageSharingMode.AutoDispose)) 
      { 
         ocrPage.Recognize(null); 
         ocrDocument.Pages.Add(ocrPage); 
      } 
             
      // Verify that the document has 2 pages 
      System.Diagnostics.Debug.Assert(ocrDocument.Pages.Count == 2); 
             
      // Save the document 
      ocrDocument.Save(@"C:\LEADTOOLS22\Resources\Images\Document.pdf", DocumentFormat.Pdf, null); 
             
      // The result will be a PDF file with two pages 
   } 
             
   // Finally, delete the document file 
   System.IO.File.Delete(documentFile); 
   ocrEngine.Dispose(); 
} 

// Create the engine instance 
using(IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD)) 
{ 
   // Start up the engine 
   ocrEngine.Startup(null, null, null, @"C:\LEADTOOLS22\Bin\Common\OcrLEADRuntime"); 
             
   // Convert the multipage TIF image to a PDF document 
   ocrEngine.AutoRecognizeManager.Run( 
      @"C:\LEADTOOLS22\Resources\Images\Ocr.tif", 
      @"C:\LEADTOOLS22\Resources\Images\Document.pdf", 
      DocumentFormat.Pdf, 
      null, 
      null); 
}