An AppWizard application generated with OLE Container and Splitter Window support will generate an Access Violation when a splitter pane containing an in-place active item is closed. The Access Violation occurs when you try to call m_pView->AssertValid() from the COleClientItem::AssertValid() function.

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The AppWizard fails to add an OnDestroy() member function to the view class to deactivate the in-place active object when the view containing the in-place active object is destroyed. When the view containing the active object is destroyed, the remaining view is resized. Because the object in the destroyed view was not properly deactivated, the subsequent call to GetInPlaceActiveObject() in the view's OnSize() function erroneously detects an in-place active COleClientItem object.

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To work around the problem, add the following handler for the WM_DESTROY message to your view class:

void CYourView::OnDestroy()
{
   CView::OnDestroy();

   COleClientItem* pActiveItem =
      GetDocument()->GetInPlaceActiveItem(this);
   if (pActiveItem != NULL && pActiveItem->GetActiveView() == this)
   {
      pActiveItem->Deactivate();
      ASSERT(GetDocument()->GetInPlaceActiveItem(this) == NULL);
   }
}
				

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Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem has been fixed in Visual C++ version 5.0.

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