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MQL5 programming language: Advanced use of the trading platform MetaTrader 5. Creating trading robots and indicators
Timur Mashnin
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admin@tmsoftstudio.com

Introduction
I hope all of you have already read the MQL5 guide on the https://www.mql5.com/ru/docs site.
We will not recount this document and will focus on its practical use. We will allow ourselves only to quote it occasionally.
As stated in the foreword to the MQL5 handbook: Programs written in the MetaQuotes Language 5 have different features and purposes.
And then there is the listing: Experts, Custom indicators, Scripts, Libraries, and Include files.
Scripts are used to perform one-time actions, only processing the event of its launching, and therefore they will not be of interest to us here.
Also, we are not interested in the libraries, since the use of included files is more preferable in order to reduce overhead.
Therefore, we will focus on the creation of advisors and indicators using include files. That it is our goal of using the MQL5 programming language, which has an interesting syntax, of course, but it will only help us.
In fact, a programming in MQL5 is a prime example of an event-oriented programming, as all the code of a MQL5 application is based on overridden callbacks - handlers of client terminal events and user events. And already in the code of the callback functions, you can use either procedural programming, or object-oriented programming. Here we will look at both of these approaches.
Common indicator structure
An indicator code begins with the block of declaring indicator properties and various objects used by an indicator, such as indicator buffer arrays, input parameters, global variables, handles of used technical indicators, and constants.
This block of code is executed by the application MetaTrader 5 Trading Platform immediately when attaching the indicator to the symbol chart.
After the code block of the declaration of indicator properties and its parameters and variables, there is a description of callback functions, which the terminal calls upon the occurrence of events such as the initialization of the indicator after it is downloaded, before the deinitialization of the indicator, when changing the price data, when changing the symbol chart by a user.
To handle the above-mentioned events it is necessary to define functions such as the OnInit(), OnDeinit(), OnCalculate(), and OnChartEvent().
In the OnInit() function of an indicator, ............

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