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Using a Compatibility Layer to Port MT4 Indicators and EAs to MT5

Article MQL5 code base
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Summary

The document introduces a compatibility library intended to help migrate MetaTrader 4 indicators and Expert Advisors to MetaTrader 5. It describes replacing familiar MT4 calls with wrapper functions that retrieve prices, symbol properties, and bar data, such as bid and ask quotes, digits, tick values, spreads, and OHLC values. The library is presented as an include file or code that can be integrated directly into a project.

The suggested workflow is to adapt existing code to the compatibility functions, then maintain a shared implementation for both platforms. The article also says developers can extend the library with additional functions. Its function table gives concrete examples of the mapping, but the document supplies no source code, test results, or details about unsupported functions and behavioral differences between platform APIs. It is therefore a migration overview rather than evidence that every MT4 program will run unchanged on MT5.

Key ideas

  • The library aims to ease porting MT4 indicators and Expert Advisors to MT5.
  • It maps common MT4 price and symbol queries to replacement functions for cross-platform code.
  • Developers are advised to integrate the library and replace calls with its compatibility versions.
  • The document gives example mappings but no test evidence or complete coverage of platform differences.

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.