OpenTween.InternetSecurityManager.InternetSecurityManager C# (CSharp) Метод

        public InternetSecurityManager(WebBrowser _WebBrowser)
        {
            // ActiveXコントロール取得
            _WebBrowser.Url = new Uri("about:blank"); //ActiveXを初期化する

            do
            {
                Thread.Sleep(100);
                Application.DoEvents();
            } while (_WebBrowser.ReadyState != WebBrowserReadyState.Complete);

            ocx = _WebBrowser.ActiveXInstance;

            // IServiceProvider.QueryService() を使って IProfferService を取得
            ocxServiceProvider = (WebBrowserAPI.IServiceProvider)ocx;

            try
            {
                ocxServiceProvider.QueryService(
                    ref WebBrowserAPI.SID_SProfferService,
                    ref WebBrowserAPI.IID_IProfferService, out profferServicePtr);
            }
            catch (SEHException ex)
            {
                MyCommon.TraceOut(ex, "ocxServiceProvider.QueryService() HRESULT:" + ex.ErrorCode.ToString("X8") + Environment.NewLine);
                return;
            }
            catch (ExternalException ex)
            {
                MyCommon.TraceOut(ex, "ocxServiceProvider.QueryService() HRESULT:" + ex.ErrorCode.ToString("X8") + Environment.NewLine);
                return;
            }


            profferService = (WebBrowserAPI.IProfferService)Marshal.GetObjectForIUnknown(profferServicePtr);

            // IProfferService.ProfferService() を使って
            // 自分を IInternetSecurityManager として提供
            try
            {
                int cookie = 0;
                profferService.ProfferService(
                    ref WebBrowserAPI.IID_IInternetSecurityManager, this, out cookie);
            }
            catch (SEHException ex)
            {
                MyCommon.TraceOut(ex, "IProfferSerive.ProfferService() HRESULT:" + ex.ErrorCode.ToString("X8") + Environment.NewLine);
                return;
            }
            catch (ExternalException ex)
            {
                MyCommon.TraceOut(ex, "IProfferSerive.ProfferService() HRESULT:" + ex.ErrorCode.ToString("X8") + Environment.NewLine);
                return;
            }
        }