I wonder if it is possible to code an EA that scans all the symbols in the market watch?

 
or do i need to open the symbols that i want to scan? (mt5)

thanks
 

Page 3 of this thread, there is a code scanning all symbols and all timeframe.

Scroll down to the middle of page to see the code.

Just copy and paste the code and use.

https://www.mql5.com/en/forum/293936/page3

MetaTrader 4 and MetaTrader 5 Memory and Data Loading Management Comparison
MetaTrader 4 and MetaTrader 5 Memory and Data Loading Management Comparison
  • 2018.12.08
  • www.mql5.com
I have built an indicator with MQL5 and MQL4 language compatible...
Reason: