Función DeinitializeEngine

IEngine* FineReaderEngine = 0;
HMODULE EngineLibraryHandle = 0;
static HRESULT deinitializeEngine()
{
 // Liberar el objeto Engine
 if( FineReaderEngine != 0 ) {
  FineReaderEngine->Release();
  FineReaderEngine = 0;
 }
 // Llamar a DeinitializeEngine
 typedef HRESULT (STDAPICALLTYPE* DeinitializeEngineFunc)();
 DeinitializeEngineFunc pDeinitializeEngine =
  (DeinitializeEngineFunc)GetProcAddress( EngineLibraryHandle, "DeinitializeEngine" );
 if( pDeinitializeEngine == 0 || FAILED( pDeinitializeEngine() ) ) {
  setLastErrorInfo( L"No se puede descargar FineReader Engine." );
  return E_UNEXPECTED;
 }
 return S_OK;
}

public class EngineLoader : IDisposable
{
    // Descargar FineReader Engine
    public void Dispose()
    {
        if (engine == null)
        {
            // Engine no se cargó
            return;
        }
        engine = null;
        // Eliminar todos los objetos antes de llamar a FreeLibrary
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();
        int hresult = deinitializeEngine();
 
        hresult = dllCanUnloadNow();
        if (hresult == 0)
        {
            FreeLibrary(dllHandle);
        }
        dllHandle = IntPtr.Zero;
        initializeEngine = null;
        deinitializeEngine = null;
        dllCanUnloadNow = null;
        // Generar una excepción después de la limpieza
        Marshal.ThrowExceptionForHR(hresult);
    }
    // Funciones de Kernel32.dll
    [DllImport("kernel32.dll")]
    private static extern IntPtr LoadLibraryEx(string dllToLoad, IntPtr reserved, uint flags);
    private const uint LOAD_WITH_ALTERED_SEARCH_PATH = 0x00000008;
    [DllImport("kernel32.dll")]
    private static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
    [DllImport("kernel32.dll")]
    private static extern bool FreeLibrary(IntPtr hModule);
    // Funciones de FREngine.dll
    [UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode)]
    private delegate int InitializeEngine( string customerProjectId, string LicensePath, string LicensePassword, , , , ref FREngine.IEngine engine);
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    private delegate int DeinitializeEngine();
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    private delegate int DllCanUnloadNow();
    // Variables privadas
    private FREngine.IEngine engine = null;
    // Identificador de FREngine.dll
    private IntPtr dllHandle = IntPtr.Zero;
    private InitializeEngine initializeEngine = null;
    private DeinitializeEngine deinitializeEngine = null;
    private DllCanUnloadNow dllCanUnloadNow = null;
}