设置 MFC 控件的工具提示

BOOL CBlockManagerTabDlg::OnToolNeedText( UINT id, NMHDR* pNMHDR, LRESULT* pResult )
{
  if(pNMHDR)
  {
    //get the resource ID from sender
    UINT nID = ::GetDlgCtrlID((HWND)pNMHDR->idFrom);
    LPTOOLTIPTEXT lpTTT = (LPTOOLTIPTEXT)pNMHDR;
    //is window handle to the tool
    if ( !(lpTTT->uFlags & TTF_IDISHWND) )
      return FALSE;
    CToolTipCtrl* pToolTip = ::AfxGetModuleThreadState()->m_pToolTip;
    if (!pToolTip)
      return FALSE;
    //magically enables \r\n
    pToolTip->SetMaxTipWidth(SHRT_MAX);
    //init ptr
    LPCTSTR lpszTipMsg = NULL;
    //add our text(TCHAR[80] max) when we find our resource ID
    switch(nID)
    {
    case IDC_BUTTON_DSK_TOP:
      {
        lpszTipMsg = _T("Go to Desktop Folder");
      }
      break;
    case IDC_BUTTON_HOME:
      {
        lpszTipMsg = _T("Go to Default Folder");
      }
      break;
    case IDC_BUTTON_MY_DOC:
      {
        lpszTipMsg = _T("Go to My Documents Folder");
      }
      break;
    case IDC_LIST_BLKICON:
      {
        pToolTip->CenterWindow(CWnd::FromHandle((HWND)pNMHDR->idFrom));
        lpszTipMsg = _T("Double Click or Drag a block to insert");
      }
      break;
    case IDC_TREE_FLDR:
      {
        pToolTip->CenterWindow(CWnd::FromHandle((HWND)pNMHDR->idFrom));
        lpszTipMsg = _T("Double Click to insert\r\nDrag to open\r\nRight Click Folder to set as default");
      }
      break;
    } //switch
    if(!lpszTipMsg)
      return FALSE;
    //copy buf to tooltip
    ::lstrcpyn(lpTTT->szText,lpszTipMsg,sizeof(lpTTT->szText));
  }
  return TRUE;
}

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this->EnableToolTips(TRUE);