Trying to call indicator inside a for from inut symbols (MQL5)

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I need the ATR data of each symbol that they put in a symbol string, for example ("EURUSD,GBPUSD,USDCHF"), or

I did it this way but it doesn't bring the data correctly and I can't do the iCustom in OnInit either because how does it save the data of the for??

please help

The code:

void SendAlert(){   
   string to_split=Pairs; //Pairs("EURUSD,GBPUSD,USDCHF")
   string sep=",";                
   ushort u_sep=StringGetCharacter(sep,0);
   string result[];
   int k=StringSplit(to_split,u_sep,result);
   
   if(k>0){
      for(int i=0; i<k; i++){
         if(SymbolSelect(result[i],true)){
            double ATR[];
            int ATR_aux=iATR(result[i],TimeFrames,ATRPeriod);
            ArraySetAsSeries(ATR,true);
            CopyBuffer(ATR_aux,0,0,ATRPeriod,ATR);
            Volatility=(((NormalRange(result[i])*AlertValue)/100)+NormalRange(result[i]));
            if(ATR[0]>=Volatility){
               Alert("ATR Volatility Alert / "+result[i]+" / "+DoubleToString(Pips(ATR[0]),2));
            }
         }
      }
   }
}
  
            int ATR_aux=iATR(result[i],TimeFrames,ATRPeriod);
            ArraySetAsSeries(ATR,true);
            CopyBuffer(ATR_aux,0,0,ATRPeriod,ATR);

Perhaps you should read the manual, especially the examples.
   How To Ask Questions The Smart Way. (2004)
      How To Interpret Answers.
         RTFM and STFW: How To Tell You've Seriously Screwed Up.

They all (including iCustom) return a handle (an int). You get that in OnInit. In OnTick/OnCalculate (after the indicator has updated its buffers), you use the handle, shift and count to get the data.
          Technical Indicators - Reference on algorithmic/automated trading language for MetaTrader 5
          Timeseries and Indicators Access / CopyBuffer - Reference on algorithmic/automated trading language for MetaTrader 5
          How to start with MQL5 - General - MQL5 programming forum - Page 3 #22 (2020)
          How to start with MQL5 - MetaTrader 5 - General - MQL5 programming forum - Page 7 #61 (2020)
          MQL5 for Newbies: Guide to Using Technical Indicators in Expert Advisors - MQL5 Articles (2010)
          How to call indicators in MQL5 - MQL5 Articles (2010)

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