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How to: Clear the Undo Stack

The following procedure below explains how to clear the undo stack.

To clear the undo stack

  • To clear the undo stack use the IOleUndoManager::DiscardFrom method. The following is an example of this:

    HRESULT CCmdWindow::ClearUndoStack()
    {
      HRESULT hr = S_OK;
    
      if (m_pUndoMgr == NULL)
        {
        IfFailGo(m_pTextLines->GetUndoManager(&m_pUndoMgr));
        ASSERT(m_pUndoMgr != NULL, "",;);
        }
    
      IfFailGo(m_pUndoMgr->DiscardFrom(NULL));
    
    Error:
      return hr;
    }
    

See Also

Concepts

How to: Implement Undo Management