Downloading history automatically?

[Ammar Yaseen]

I have made an EA that uses 28 currency and M1 timeframe. Is there any script or way to download all 28 currency pairs data for atleast 3 years. I am avoiding manual work 

[William Roeder]

1. You must download history for the pairs.

   If you don't have any history, here's how you can get all available from your broker.

   • On MT4: Most brokers only have 32 or 65K bars of history per timeframe. That's 45 days of M1, 2.5 years on M15, etc.
   • Quickly DL all available history from your broker: Problem loading historical data - MQL4 programming forum (2010)

   Otherwise, you will have to download history from elsewhere. MT4 history: How to Start with Metatrader 5 - General - MQL5 programming forum - Page 94 #932 (2017)

2. Have your EA keep them updated.

   On MT4: Unless the current chart is that specific symbol(s)/TF(s) referenced, you must handle 4066/4073 errors before accessing candle/indicator values.
             Download history in MQL4 EA - Forex Calendar - MQL4 programming forum - Page 3 #26.4 (2019)

   On MT5: Unless the current chart is that specific pair/TF, you must synchronize the terminal Data from the Server before accessing candle/indicator values.
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             Timeseries and Indicators Access / Data Access - Reference on algorithmic/automated trading language for MetaTrader 5
             Synchronize Server Data with Terminal Data - Symbols - General - MQL5 programming forum #2 (2018)
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