EA supporting multiple pairs

[Ernest Klokow]

I am trying to create an EA that will trade multiple pairs although only loaded on one pair.

I have created the following two variables:

string   Pairs[28] = {"AUDCAD, AUDCHF, AUDJPY, AUDNZD, AUDUSD, CADCHF, CADJPY, CHFJPY, EURAUD, EURCAD, EURCHF, EURGBP, EURNZD, EURUSD, EURJPY, GBPAUD, GBPCAD, GBPCHF, GBPJPY, GBPNZD, GBPUSD, NZDCAD, NZDCHF, NZDJPY, NZDUSD, USDCAD, USDCHF, USDJPY"};
string   symbol;

And then I have this code:

     for(int j=0; j<=27; j++)
     
      {
      
      Pairs[j] = symbol;
      
      OpenPrice = iOpen(symbol,0,1);
      ClosePrice = iClose(symbol,0,1);
     
       ...........

     }

But it is not working. Can anybody tell me why?

[Enrique Dangeroux]

Your Array contains only 1 value:

[0] == "AUDCAD, AUDCHF, AUDJPY, AUDNZD, AUDUSD, CADCHF, CADJPY, CHFJPY, EURAUD, EURCAD, EURCHF, EURGBP, EURNZD, EURUSD, EURJPY, GBPAUD, GBPCAD, GBPCHF, GBPJPY, GBPNZD, GBPUSD, NZDCAD, NZDCHF, NZDJPY, NZDUSD, USDCAD, USDCHF, USDJPY"

It should be {"AUDCAD", "AUDCHF", ...."}

[Grzegorz Pawlak]

Hi, if you want create EA for MT4 it that will not work, MT4 not support multi currency EA. Regards Greg 

[William Roeder]

Greg Pawlak: if you want create EA for MT4 it that will not work, MT4 not support multi currency EA. Regards Greg 

1. False, works just fine. It is the tester that doesn't support multi-currency.
2. Why did you post your MT4 question in the Root / MT5 EA section instead of the MQL4 section, (bottom of the Root page?)
             General rules and best pratices of the Forum. - General - MQL5 programming forum
   Next time post in the correct place. The moderators will likely move this thread there soon.

3. I recommend: Do not trade multiple currencies in one EA.
   • You can't use any {MT4: predefined variables, MT5: predefined variables,}
   • MT4: can't use the tester.
   • must poll (not OnTick, unless you use specific indicators)
               The Implementation of a Multi-currency Mode in MetaTrader 5 - MQL5 Articles
   • and usually other problems, e.g. A problem with iBarShift - MQL4 programming forum - Page 2
   • You must handle History {MT4:4066/4073 errors: Download history in MQL4 EA - MQL4 programming forum , MT5: Timeseries and Indicators Access /  Data Access - Reference on algorithmic/automated trading language for MetaTrader 5.}
   • Code it to trade the chart pair only. Look at the others if you must. Don't assume that Time[i] == iTime(otherPair, TF, i) always use iBarShift (or MT5 equivalent.)
   • Then put it on other charts to trade the other pairs. Done.

[Ernest Klokow]

Enrique Dangeroux:

Your Array contains only 1 value:

[0] == "AUDCAD, AUDCHF, AUDJPY, AUDNZD, AUDUSD, CADCHF, CADJPY, CHFJPY, EURAUD, EURCAD, EURCHF, EURGBP, EURNZD, EURUSD, EURJPY, GBPAUD, GBPCAD, GBPCHF, GBPJPY, GBPNZD, GBPUSD, NZDCAD, NZDCHF, NZDJPY, NZDUSD, USDCAD, USDCHF, USDJPY"

It should be {"AUDCAD", "AUDCHF", ...."}

Thank you! That was a stupid mistake from me!

[Ernest Klokow]

William Roeder:

1. False, works just fine. It is the tester that doesn't support multi-currency.

2. I recommend: Do not trade multiple currencies in one EA.
   • You can't use any {MT4: predefined variables, MT5: predefined variables,}
   • MT4: can't use the tester.
   • must poll (not OnTick, unless you use specific indicators)
               The Implementation of a Multi-currency Mode in MetaTrader 5 - MQL5 Articles
   • and usually other problems, e.g. A problem with iBarShift - MQL4 programming forum - Page 2
   • You must handle History {MT4:4066/4073 errors: Download history in MQL4 EA - MQL4 programming forum , MT5: Timeseries and Indicators Access /  Data Access - Reference on algorithmic/automated trading language for MetaTrader 5.}
   • Code it to trade the chart pair only. Look at the others if you must. Don't assume that Time[i] == iTime(otherPair, TF, i) always use iBarShift (or MT5 equivalent.)
   • Then put it on other charts to trade the other pairs. Done.

William I really appreciate your feedback! Thank you very much. I think I will stick to one EA one pair as you recommend.