Como deve tratar erros de script como um anfitrião de controlo WebBrowser

   STDMETHODIMP CMyBrowser::Exec( const GUID* pguidCmdGroup, DWORD nCmdID,
      DWORD nCmdexecopt, VARIANTARG* pvaIn, VARIANTARG* pvaOut )
   {

      HRESULT hr = S_OK;

      if (pguidCmdGroup && IsEqualGUID(*pguidCmdGroup, CGID_DocHostCommandHandler))
      {
         
         switch (nCmdID) 
         {
         
         case OLECMDID_SHOWSCRIPTERROR:
         {
            IHTMLDocument2*             pDoc = NULL;
            IHTMLWindow2*               pWindow = NULL;
            IHTMLEventObj*              pEventObj = NULL;
            BSTR                        rgwszNames[5] = 
                                        { 
                                           SysAllocString(L"errorLine"),
                                           SysAllocString(L"errorCharacter"),
                                           SysAllocString(L"errorCode"),
                                           SysAllocString(L"errorMessage"),
                                           SysAllocString(L"errorUrl")
                                        };
            DISPID                      rgDispIDs[5];
            VARIANT                     rgvaEventInfo[5];
            DISPPARAMS                  params;
            BOOL                        fContinueRunningScripts = true;
            int	                        i;

            params.cArgs = 0;
            params.cNamedArgs = 0;

            // Get the document that is currently being viewed.
            hr = pvaIn->punkVal->QueryInterface(IID_IHTMLDocument2, (void **) &pDoc);				
            // Get document.parentWindow.
            hr = pDoc->get_parentWindow(&pWindow);
            pDoc->Release();
            // Get the window.event object.
            hr = pWindow->get_event(&pEventObj);
            // Get the error info from the window.event object.
            for (i = 0; i < 5; i++) 
            {  
               // Get the property's dispID.
               hr = pEventObj->GetIDsOfNames(IID_NULL, &rgwszNames[i], 1, 
                       LOCALE_SYSTEM_DEFAULT, &rgDispIDs[i]);
               // Get the value of the property.
               hr = pEventObj->Invoke(rgDispIDs[i], IID_NULL,
LOCALE_SYSTEM_DEFAULT,
                       DISPATCH_PROPERTYGET, &params, &rgvaEventInfo[i],
NULL, NULL);
               SysFreeString(rgwszNames[i]);
            }

            // At this point, you would normally alert the user with 
            // the information about the error, which is now contained
            // in rgvaEventInfo[]. Or, you could just exit silently.

            (*pvaOut).vt = VT_BOOL;
            if (fContinueRunningScripts)
            {
               // Continue running scripts on the page.
               (*pvaOut).boolVal = VARIANT_TRUE;
            }
            else
            {
               // Stop running scripts on the page.
               (*pvaOut).boolVal = VARIANT_FALSE;			
            } 
            break;
         }
         default:
            hr = OLECMDERR_E_NOTSUPPORTED;
            break;
         }
      }
      else
      {
         hr = OLECMDERR_E_UNKNOWNGROUP;
      }
      return (hr);
   }