Re: Annotation object

[User (Legacy)]

HI Serge, 

From what I understand with the getextension call, a failure to return !NULL 

means it was found.  Frank told me a while ago to try and use the 

raw_GetExtension call so that it doesn't return and cause an unhandled 

exception (or something like that- I had an awful time handling the return 

of the GetExtension). 

Here is some code that works for me: 

The first part will check to see if it already exists.  If it does not 

exist, it will create it.  Then it places the toolbar onto the window. 

 IAnnListPtr pAnnList; 

 _bstr_t annotation = "AnnotationX.AnnList"; 

  try 

  { 

   chartfx->raw_GetExtension(annotation, (IUnknown **) &pAnnList); 

   if (pAnnList == NULL) 

   { 

    pAnnList.CreateInstance(__uuidof(AnnotationX)); 

    HRESULT rs = chartfx->AddExtension((IUnknown *)pAnnList); 

   } 

  } 

  catch(...) 

  { 

   pAnnList.CreateInstance(__uuidof(AnnotationX)); 

   HRESULT rs = chartfx->AddExtension((IUnknown *)pAnnList); 

  } 

  pAnnList->Enabled = TRUE; 

  pAnnList->put_ToolBar(TRUE); 

  IToolBar *toolbar; 

  pAnnList->get_ToolBarObj(&toolbar); 

  toolbar->put_Visible(TRUE); 

  toolbar->put_Docked(TGFP_BOTTOM); 

and when I want to remove the extension (and this removes the toolbar also): 

  try 

  { 

   chartfx->raw_GetExtension(annotation, (IUnknown **) &pAnnList); 

  } 

  catch(...) 

  { 

  } 

  if (pAnnList != NULL) chartfx->raw_RemoveExtension(annotation); 

HTH 

-- 

Josh Eanes 

"Serge S. Spiridonoff" <sss@corbina.net> wrote in message 

news:DE0379D14694D211B4CE00609770710D05BFFF@sftfx-221.wamnet.net... 

> To explain my question in the previous post. 

> 

> I can't get the method GetExtension to work. 

> 

> ... 

> m_pChartFX->AddExtension((IUnknown *)m_pAnnotationList); 

> 

> // for test purposes 

> if (m_pChartFX->GetExtension(_T("AnnotationX.AnnList")) == NULL) { 

> ... 

> 

> In the above code, GetExtension returns an error CO_E_CLASSSTRING (Invalid 

> class string). 

> I also tried "AnnotateX.AnnList" as suggested by the help but it also 

> returns the same error. 

> 

> AddExtension works fine because the annotation toolbar appears on the 

chart. 

> 

> Why I need to call GetExtension? 

> 

> I call AddExtension just after creation of the chart control 

> (CreateInstanceLic). Then, depending on user selection, I may call the 

> Import() method to load previously saved chart. 

> If the chart being loaded is 3.0 format, then the extension disappears (no 

> annotate toolbar) after the call to Import(). 

> Btw, why? 

> So I need to do AddExtension second time. However, sometimes I get 2 

> annotate toolbars, so I need to check whether the extension is already 

> added. 

> 

> So the question is: how to correctly check that the annotation extension 

is 

> already added to the chart? 

> 

> Thanks, 

> Serge 

> 

>