User (Legacy) Posted July 25, 2000 Report Share Posted July 25, 2000 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 Link to comment Share on other sites More sharing options...
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