IOcrLanguageManager Interface

Summary

Provides access to the language environment of the character sets used by the IOcrEngine.

Syntax

Objective-C

C++/CLI

Java

Python

public interface IOcrLanguageManager

@interface LTOcrLanguageManager : NSObject

public class OcrLanguageManager

public interface class IOcrLanguageManager

class IOcrLanguageManager:

Remarks

You can access the instance of the IOcrLanguageManager used by an IOcrEngine through the IOcrEngine.LanguageManager property.

The language environment defines the character set(s) recognized by the OCR engine. For example, if you enable the English and German languages, the German characters (ä, Ä, é, ö, Ö, ü, Ü, ß) will be combined with the English characters to define the set recognized by the engine. The language environment does not perform spell checking however, for that, refer to IOcrSpellCheckManager.

The IOcrLanguageManager allows you to do the following:

Query the languages supported by the OCR engine using the GetSupportedLanguages and IsLanguageSupported methods.
Enable or disable specific language character sets from participating in the spell checking subsystem using the EnableLanguages and GetEnabledLanguages methods.

The language values used throughout the LEADTOOLS OCR toolkit is a string value based on RFC 4646 (Windows Vista and later). The name could be an ISO 639 two-letter lowercase culture code associated with a language or a combination of ISO 630 and ISO 3166 two-letter uppercase subculture code associated with a country or region.

You must call the IOcrEngine.Startup method before you can use the IOcrEngine.LanguageManager property.

Note: The IOcrLanguageManager state is also saved when the engine settings are saved. For more information, refer to IOcrSettingManager.

Example

This example will enumerate the languages supported by the OCR engine then enable the current culture language plus German.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Ocr; 
 
public void OcrLanguageManagerExample() 
{ 
   // Create an instance of the engine 
   using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD)) 
   { 
      // Start the engine using default parameters 
      ocrEngine.Startup(null, null, null, LEAD_VARS.OcrLEADRuntimeDir); 
 
      // Show languages supported by this engine 
      string[] supportedLanguages = ocrEngine.LanguageManager.GetSupportedLanguages(); 
 
      Console.WriteLine("Supported languages:"); 
      foreach (string supportedLanguage in supportedLanguages) 
      { 
         // Get the friendly name of this language using the .NET CultureInfo class 
         CultureInfo ci = new CultureInfo(supportedLanguage); 
         Console.WriteLine("  {0} ({1})", supportedLanguage, ci.EnglishName); 
      } 
 
      // Check if current culture info language is supported 
      CultureInfo currentCulture = CultureInfo.CurrentCulture; 
      string name = currentCulture.TwoLetterISOLanguageName; 
      bool supported = ocrEngine.LanguageManager.IsLanguageSupported(name); 
      if (!supported) 
      { 
         name = currentCulture.Name; 
         supported = ocrEngine.LanguageManager.IsLanguageSupported(name); 
      } 
 
      if (supported) 
      { 
         Console.WriteLine("Current culture is {0}, and it is supported by this OCR engine. Enabling only this language and German now", currentCulture.EnglishName); 
         ocrEngine.LanguageManager.EnableLanguages(new string[] { name, "de" }); 
 
         // If this engine does not support enabling multiple languages (currently the LEADTOOLS Advantage OCR engine), then GetEnabledLanguages 
         // will always return an array of 1, make a note of this 
         if (!ocrEngine.LanguageManager.SupportsEnablingMultipleLanguages) 
            Console.WriteLine("This engine supports enabling only one language at a time, so only the first language we enabled will be used"); 
 
         string[] enabledLanguages = ocrEngine.LanguageManager.GetEnabledLanguages(); 
         Console.WriteLine("Current enabled languages in the engine are:"); 
         foreach (string enabledLanguage in enabledLanguages) 
         { 
            // Get the friendly name of this language using the .NET CultureInfo class 
            CultureInfo ci = new CultureInfo(enabledLanguage); 
            Console.WriteLine("  {0} ({1})", enabledLanguage, ci.EnglishName); 
         } 
      } 
      else 
         Console.WriteLine("Current culture is {0}, and it is not supported by this OCR engine", currentCulture.EnglishName); 
 
      ocrEngine.Shutdown(); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string OcrLEADRuntimeDir = @"C:\LEADTOOLS22\Bin\Common\OcrLEADRuntime"; 
}