INI-Datei auslesen mit Variablen

[Nalincah]

Delphi-Quellcode:

procedure TFrmDesignExpression.ListBox4Click(Sender: TObject);
var
  ini       : TIniFile;
  section   : String;
  ident,s   : string;
begin
  try
    section := ListBox3.Items[ListBox3.ItemIndex];
    ident   := Listbox4.items[listbox4.itemindex];
    s := ini.ReadString(section,ident,'');
  finally
    ini.free;
  end;
end;

Warum geht das nicht?