Your code is insufficient to analyse the issue. The sample you provide does not have any code for producing CSV files. In fact there are no File Functions at all.

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How To Ask Questions The Smart Way. (2004)
Be precise and informative about your problemIs your iCustom call in OnInit or with all the rest? 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
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MQL5 for Newbies: Guide to Using Technical Indicators in Expert Advisors - MQL5 Articles (2010)
How to call indicators in MQL5 - MQL5 Articles (2010) - RDBS: please help me to get the buffer details in my .csv file.
Help you with what? You haven't stated a problem, you stated a want. Show us your attempt (using the CODE button) and state the nature of your difficulty.
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Hiring to write script - General - MQL5 programming forum (2018)We're not going to code it for you (although it could happen if you are lucky or the issue is interesting).
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Hello friends please help me to get the buffer details in my .csv file.
I have written the following code for the buffer details:
iCustom buffer details unable to get them in .csv file....
Please any one help me who knows this ..Thanks and regards