//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//---
      static double lastHigh;
      static double lastLow;

      MqlRates priceInfo[];

      ArraySetAsSeries(priceInfo, true);

      int priceData = CopyRates(_Symbol, _Period, 0, 3, priceInfo);

      if ((lastHigh != priceInfo[1].high) && (lastLow != priceInfo[1].low)) {

         int handle = FileOpen("aaa.csv", FILE_READ|FILE_WRITE|FILE_CSV|FILE_ANSI);

        FileSeek(handle, 0, SEEK_END);

        FileWrite(handle, "Time", priceInfo[1].time);
        FileClose(handle);
        lastHigh = priceInfo[1].high;
        lastLow = priceInfo[1].low;

        Comment(priceInfo[1].high);
      }
  }
//+------------------------------------------------------------------+