Shutdown Method

Summary

Shuts down the OCR engine and frees all resources and memory allocated to it.

Syntax

Objective-C

C++/CLI

Java

Python

public void Shutdown()

- (void)shutdown

public void shutdown()

void Shutdown();

def Shutdown(self):

Remarks

The Startup method must be called before invoking any other methods or properties in this IOcrEngine.

To check if the engine is started, use the IsStarted property.

You must call Shutdown to shut down the engine and free the memory and resources used.

You can call the Startup method multiple times, only the first call will start the engine while subsequent calls will only increment an internal counter. You must call Shutdown for each Startup called.

The IOcrEngine interface implements IDisposable. It is highly recommended that you call Dispose (or use the using statement in C# or Using statement in VB) when creating the IOcrEngine instance. The Dispose method will automatically shut down the engine if it has been started.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Ocr; 
using Leadtools.Document.Writer; 
 
public void StartupEngineExample() 
{ 
   // Use RasterCodecs to load an image file 
   // Note: You can let the engine load the image file directly as shown in the other examples 
   RasterCodecs codecs = new RasterCodecs(); 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif")); 
 
   // Assume you copied the engine runtime files to C:\MyApp\Ocr 
   string engineDir = @"C:\MyApp\Ocr"; 
 
   // Store the engine work directory into a path inside our application 
   string workDir = @"C:\MyApp\OcrTemp"; 
 
   // Delete all files in the work directory in case the previous version of our application exited abnormally and 
   // the engine did not get the chance to clean all of its temporary files (if any) 
   Directory.Delete(workDir, true); 
 
   // Re-create the work directory 
   Directory.CreateDirectory(workDir); 
 
   // Create an instance of the engine 
   using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD)) 
   { 
      // Show that the engine has not been started yet 
      Console.WriteLine("Before calling Startup, IsStarted = " + ocrEngine.IsStarted); 
 
      // Start the engine using our parameters 
      // Since we already have a RasterCodecs object, we can re-use it to save memory and resources 
      ocrEngine.Startup(codecs, null, workDir, engineDir); 
 
      // Make sure the engine is using our working directory 
      Console.WriteLine("workDir passed is {0}, the value of WorkDirectory after Startup is {1}", workDir, ocrEngine.WorkDirectory); 
 
      // Show that the engine has started fine 
      Console.WriteLine("After calling Startup, EngineType is {0}, IsStarted = {1}", ocrEngine.EngineType, ocrEngine.IsStarted); 
 
      // Maks sure the engine is using our own version of RasterCodecs 
      Debug.Assert(codecs == ocrEngine.RasterCodecsInstance); 
 
      // Create a page from the raster image as page to the document 
      IOcrPage ocrPage = ocrEngine.CreatePage(image, OcrImageSharingMode.AutoDispose); 
      // image belongs to the page and will be dispose when the page is disposed 
 
      // Recognize the page 
      // Note, Recognize can be called without calling AutoZone or manually adding zones. The engine will 
      // check and automatically auto-zones the page 
      ocrPage.Recognize(null); 
 
      // Create a file based document 
      using (IOcrDocument ocrDocument = ocrEngine.DocumentManager.CreateDocument(null, OcrCreateDocumentOptions.AutoDeleteFile)) 
      { 
         // Add the page 
         ocrDocument.Pages.Add(ocrPage); 
         // No need for the page anymore 
         ocrPage.Dispose(); 
 
         // Save the document we have as PDF 
         string pdfFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.pdf"); 
         ocrDocument.Save(pdfFileName, DocumentFormat.Pdf, null); 
      } 
 
      // Shutdown the engine 
      // Note: calling Dispose will also automatically shutdown the engine if it has been started 
      ocrEngine.Shutdown(); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}