This could help you : https://www.mql5.com/en/blogs/post/681318

MQL's OOP notes: HashMap supports old-fashioned indicators in MetaTrader 5
- 2016.11.19
- www.mql5.com
MetaTrader 5 is not back compatible with MetaTrader 4 in many aspects. This is bad, but we can do nothing with this. Yet we can do something to simplify translation of MetaTrader 4 products into MetaTrader 5. One of the problems that arises when we move from MetaTrader 4 to MetaTrader 5 is the way how latter uses different method of indicator...
Alain Verleyen:
This could help you : https://www.mql5.com/en/blogs/post/681318
Oh yes! Looks like a good starting point, at least it covers iCustom, iMA and iRSI. MQ could have tried better in terms of backward compatibility.
This could help you : https://www.mql5.com/en/blogs/post/681318
lippmaje:
Oh yes! Looks like a good starting point, at least it covers iCustom, iMA and iRSI. MQ could have tried better in terms of backward compatibility.
Oh yes! Looks like a good starting point, at least it covers iCustom, iMA and iRSI. MQ could have tried better in terms of backward compatibility.
Not yet this old song :-D

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Sometimes I need to port an advisor to MQL5. To get this done I'm looking for a way to convert MQL4 style indicator invocations more easily.
So instead of obtaining a handle and using CopyBuffer I'd like to be able to do this:
Is there any library or header that provides such an interface?