Fonction DeinitializeEngine

IEngine* FineReaderEngine = 0;
HMODULE EngineLibraryHandle = 0;
static HRESULT deinitializeEngine()
{
 // Libérer l’objet Engine
 if( FineReaderEngine != 0 ) {
  FineReaderEngine->Release();
  FineReaderEngine = 0;
 }
 // Appel de DeinitializeEngine
 typedef HRESULT (STDAPICALLTYPE* DeinitializeEngineFunc)();
 DeinitializeEngineFunc pDeinitializeEngine =
  (DeinitializeEngineFunc)GetProcAddress( EngineLibraryHandle, "DeinitializeEngine" );
 if( pDeinitializeEngine == 0 || FAILED( pDeinitializeEngine() ) ) {
  setLastErrorInfo( L"Can't unload FineReader Engine." );
  return E_UNEXPECTED;
 }
 return S_OK;
}

public class EngineLoader : IDisposable
{
    // Décharger FineReader Engine
    public void Dispose()
    {
        if (engine == null)
        {
            // L’objet Engine n’a pas été chargé
            return;
        }
        engine = null;
        // Supprimer tous les objets avant l’appel à 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;
        // lever une exception après le nettoyage
        Marshal.ThrowExceptionForHR(hresult);
    }
    // Fonctions 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);
    // Fonctions 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 privées
    private FREngine.IEngine engine = null;
    // Handle de FREngine.dll
    private IntPtr dllHandle = IntPtr.Zero;
    private InitializeEngine initializeEngine = null;
    private DeinitializeEngine deinitializeEngine = null;
    private DllCanUnloadNow dllCanUnloadNow = null;
}