c++ - Function call to return string inside ListView_SetItemText macro -

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ListView is a question on ListView_SetItemText macro to set the text of the item in Windows control. Why the following code works (text in a list is displayed in the list view) 

  std :: string strNumber = NumberToString (number); ListView_SetItemText (hListView, iItemIndex, iSubitemIndex, (LPSTR) strNumber.c_str ());   
 does not make a direct call  
  ListView_SetItemText (hListView, iItemIndex, iSubitemIndex, (LPSTR) NumberToString (number) .c_str ());   
 Where  
  std :: string numerostring (double number) {std :: ostringstream ss; SS & lt; & Lt; Number; Return ss.str (); }   
 Many thanks   
 
 
 Here is the macro definition ( Commctrl.h ):  
  #define ListView_SetItemText (w, i, iS, s) \ {\ LV_ITEM _lvi; \ _lvi.iSubItem = iS; \ _lvi.pszText = S; \ SNDMSG ((w), LVM_SETITEMTEXT, i, (LPARAM) (LV_ITEM *) and amp; _lvi); \}   
 This spreads:  
  ... _lvi.pszText = (LPSTR) numberstrosting (number). C_str (); SNDMSG ((hListView), LVM_SETITEMTEXT, iItemIndex, (lParam) (LV_ITEM *) & amp; _lvi); }   
  The NumberToString  function returns a  temporary   std :: string , which is  SDMMSG < / Code> Call therefore indicates thin air to  _lvi.pszText . (Your code will be fully protected if  ListView_SetItemText  was a real function call.)

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