long  ChartFirst();

//+------------------------------------------------------------------+
//| 脚本程序起始函数                                                   |
//+------------------------------------------------------------------+
void OnStart()
  {
//--- 取得客户端中第一个打开的图表的ID
   long            chart_id= ChartFirst();

//--- 再使用获取的ID取得图表的交易品种和周期
   string          symbol  = ChartSymbol(chart_id);
   ENUM_TIMEFRAMES period  = ChartPeriod(chart_id);

//--- 在日志中显示客户端中第一个图表的描述
   PrintFormat("ID of the first chart of the client terminal: %I64d, chart symbol: %s, chart period: %s", chart_id, symbol, StringSubstr(EnumToString(period), 7));
   /*
   结果：
   ID of the first chart of the client terminal: 133246248352168440, chart symbol: EURUSD, chart period: M1
   */
  }