FIX: ActiveX Control in IE Asserts in CTLINPLC.CPP, Line 328

CAUSE

The assert is in COleControl::BuildSharedMenu(), where it checks:

   if (m_pUIActiveInfo != NULL)
   {
      ASSERT(m_pUIActiveInfo->m_hSharedMenu != NULL);
      return TRUE;
   }
				

m_pUIActiveInfo->m_hSharedMenu will always be NULL because you are not doing menu merging. m_pUIActiveInfo is set to NULL when the control is UI de-activated. In this case, the control is inplace activated when you first click on it, so COleControl::OnActivateInPlace() is called. This, in turn, calls BuildSharedMenu(). When BuildSharedMenu() returns, but before OnActivateInPlace() is exited, Internet Explorer calls DoVerb(OLEIVERB_UIACTIVATE) on the control. This causes OnActivateInPlace() to be re-entered and BuildSharedMenu() to be called again. Because the control has not been UI-de-activated, m_pUIActiveInfo is not NULL.

   HRESULT CTestCtrl::OnActivateInPlace(BOOL bUIActivate, LPMSG pMsg)
   {
      static BOOL bInsideFunc = FALSE;
      if (!bInsideFunc)
      {
         bInsideFunc = TRUE;
         HRESULT hr = COleControl::OnActivateInPlace(bUIActivate, pMsg);
         bInsideFunc = FALSE;
         return hr;
      }
      return S_OK;
   }