Discussing the article: "Introduction to MQL5 (Part 43): Beginner Guide to File Handling in MQL5 (V)"
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Check out the new article: Introduction to MQL5 (Part 43): Beginner Guide to File Handling in MQL5 (V).
The article explains how to use MQL5 structures with binary files to persist Expert Advisor parameters. It covers defining structures, accessing members, and distinguishing simple from complex layouts, then writing and reading entire records using FileWriteStruct and FileReadStruct in FILE BIN mode. You will learn safe patterns for fixed-size data and how shared storage (FILE COMMON) enables reuse across sessions and terminals.
You run an Expert Advisor in MT5, tune parameters, and accumulate runtime state—and then the terminal closes, the chart refreshes, or the EA is removed, and everything in memory is lost. The advisor restarts “from zero”: saved settings, computed values, and coordinated configurations disappear, which is especially painful when the same EA runs on several terminals and must rely on a single shared parameter set. What you need is a simple, fast, reproducible store that survives restarts and can be shared among terminals on the same PC. This article shows how to pack EA parameters into a simple MQL5 struct and persistently save and load it from a shared binary file (FILE COMMON + FILE BIN) without manual text conversion.
Author: ALGOYIN LTD