Example

//+------------------------------------------------------------------+
//|                                                         Comm.mq5 |
//|                                  Copyright 2023, MetaQuotes Ltd. |
//|                              https://www.mql5.com/ru/users/s22aa |
//+------------------------------------------------------------------+
#property copyright "Copyright 2023, MetaQuotes Ltd."
#property link      "https://www.mql5.com/ru/users/s22aa"
#property version   "1.00"
#include <Comm.mqh>
//+------------------------------------------------------------------+
void OnTick()
  {
   MqlTick tick;
   SymbolInfoTick(_Symbol, tick);
   if(tick.ask != 0 && tick.bid != 0)
     {
      string str = StringFormat("ask  = %.5f\nbid  = %.5f\ntime = %s", tick.ask, tick.bid, TimeToString(tick.time, TIME_DATE | TIME_SECONDS));
      Comment(str);
     }
  }
//+------------------------------------------------------------------+