How can I get the value of indicator arrow in MQL4

External question — Stack Overflow Stack Exchange Author: user310291 Original post: https://stackoverflow.com/questions/78450383 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. MQL4 has this setindexarrow https://docs.mql4.com/customind/setindexarrow But how can I know its value I can't see any way with iCustom for an .ex4 (I don't have source code). I tried all 8 buffers (since it's the max on MQL4) and I can't get anything ressembling arrow code. Is it even possible ?