Creating MQL5 Indicator Handles and Reading Values with CopyBuffer
Summary
The article explains how an MQL5 Expert Advisor can obtain indicator handles and read indicator-buffer values. It covers two routes: creating a handle with IndicatorCreate() and using a technical-indicator function. IndicatorCreate() accepts indicator type and parameters, which are passed through a typed parameter array when needed. The article recommends creating handles during initialization rather than on every tick.
After handle creation, an Expert Advisor can use CopyBuffer() to retrieve values over a chosen range of bars. The example uses moving averages and Parabolic SAR, stores copied values in arrays, and sets series indexing so the latest bar is at index zero. It also describes checking CopyBuffer()’s return value and logging errors. This is a programming tutorial for accessing indicator data, not a trading strategy or evidence of indicator performance; it presents basic methods and notes that object-oriented wrappers can improve convenience in larger projects.
Key ideas
- MQL5 indicator calls return handles, which identify indicators for later data access.
- IndicatorCreate() and technical-indicator functions are alternative ways to obtain handles.
- Create indicator handles during initialization and retrieve updated values with CopyBuffer().
- Series indexing can place the latest bar at array index zero.
- Check copy results and handle errors when indicator data cannot be retrieved.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.