How to: Clear the Undo Stack

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Note

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

To clear the undo stack

  1. 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

How to: Implement Undo Management