MQL5 Indicator Handles and Buffers

Article MQL5 articles

Summary

This tutorial explains how an MQL5 Expert Advisor can read built-in technical indicators, using a moving average as its main example. It recommends creating an indicator handle during initialization when its settings are stable, copying values from the indicator buffer, and setting array indexing so the current bar and earlier bars can be addressed as a time series. It also describes a helper for copying values while choosing the desired indexing, and shows how to retrieve multiple buffers from an indicator such as the Alligator.

The article emphasizes checking that handle creation succeeded and that buffer copying returned data before using indicator values in trading logic. Its evidence is instructional code and a cautionary account of an automated system that resumed trading after reaching its intended objective; it does not present comparative tests of reliability or trading performance. The guidance is focused on MQL5 implementation and error handling. A copied value at index zero refers to the still-forming bar in the described setup, so users should account for that when building signals.

Key ideas

Create indicator handles during initialization when their parameters remain unchanged.
Check handle validity and buffer-copy results before using indicator values in trade logic.
Set array indexing deliberately so buffer values match the intended time-series access pattern.
Multi-buffer indicators require copying the appropriate buffer into each destination array.

Using MQL5 Indicator Handles and Buffers Safely in Expert Advisors

Summary

Key ideas

Tags