Expert Advisor Programming in MQL5 Part 3: OOP

Create an object-oriented expert advisor in Mql5 by cloning a template, wiring money management and signal classes, configuring a simple moving average strategy, and testing in the strategy tester.

Extend the expert advisor class with a reverse strategy by deriving a new class, overriding signal entry, and testing reversed buy/sell signals in strategy tester.

Explain the C array base class and its derived types—C array int, double, and obj—and how to add and get items using total and ath methods.

Explore the CAccountInfo class in MQL5 to access account information with a unified, object-oriented approach. Initialize a CAccountInfo instance to print the current account's login, balance, and equity.

Explain how the c terminal info class offers an object oriented way to access terminal information, initialize an instance, and print the terminal path, mirroring the c account info example.

Select a symbol with the see symbol info class, then refresh data (including tick data) to access data such as bid and ask prices.

Explore the See Order Info class to understand order states, selection by index or ticket, and accessing properties such as stop loss, take profit, and initial and current volumes.

Use the CPositionInfo class to access position properties and select a position by index, ticket, magic, or instrument name, stop loss and take profit, considering netting and hedging modes.

Explore C price series and its derived classes in MQL5, using Sipri's series for open, high, low, and close prices, with a 1024 buffer and create, refresh, and getdata workflows.

Explore the CIndicator base class, its CMA-derived indicators, and how to create, refresh, and retrieve data handles while managing memory and using include directives.

Explore see expert base, base for expert advisors and components, focusing on init and validation settings that configure symbol, time frame, every tick processing, and magic number, with boolean termination.

Explore the key expert signal class and its general signals. See how m_direction and m_threshold_open determine buy, sell, or no signal through long and short conditions weighted by m_weight.

Learn how filters are organized inside a C expert signal, stored in the M filters array, and how bottom-to-top evaluation and the open threshold produce the final direction.

Explore the expert money base class and its derived money management methods: fixed lot, fixed risk, fixed margin, and money none, and how to use check open long or short.

Discover how the CExpertTrade class streamlines expert advisor trades by using a pre-initialized CSymbolInfo object, enabling buy or sell operations with automatic order type selection and simplified parameters.

Explore the sea expert trailing hierarchy in mql5, including fixed pips, ma, and parabolic sar trailing stops; learn initialization, indicator setup, and validation steps for OnInit and OnTick.

Create a CE expert signal instance to house all the filters for the expert advisor. Pass this signal to the init signal method to finalize the setup.

Configure six external parameters for the expert advisor, including threshold open, threshold close, price level, stop loss, take profit, and exploration, to control signal firing and pending order behavior.

This walkthrough demonstrates how to add a CExpertSignal filter to an MQL5 expert advisor by selecting signal AC, creating a dynamic instance, checking for success, and assigning a weight.

Add a money management class instance to your expert advisor by including the fixed risk module, creating and verifying the instance, and linking it with the expert's init flow.

Test the expert advisor, fix compiler warnings, rename variables, and resolve duplicates to ensure a clean compile. Then run the strategy tester, adjust period settings, and review trading results.

Generate an expert advisor with the expert advisor generator, configure name, symbol, time frame, and accelerator signal, and compile parabolic SAR 0.02/0.2 to test the generated expert advisor.