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MQL4 — Complete Guide

In this tutorial, you will learn about MQL4. We cover key concepts, practical examples, and best practices to help you master this topic.

MQL4 (MetaQuotes Language 4) is the programming language for the MetaTrader 4 trading platform, used to create Expert Advisors and indicators. Master algorithmic trading with hands-on tutorials.

1. What Is MQL4?
Origins, platform, and use cases
2. MQL4 Syntax
C-like syntax, variables, and data types
3. Program Types
EAs, indicators, scripts, includes
4. Event Handlers
init, deinit, start, and tick processing
5. Functions and Scope
Custom functions, parameters, and return values
6. Preprocessor Directives
#define, #include, #property, extern
7. Technical Indicators
iMA, iRSI, iMACD, iBollingerBands
8. Expert Advisors
Building automated trading bots
9. Orders API
OrderSend, OrderSelect, OrderModify, OrderClose
10. Pending Orders
Buy Limit, Sell Limit, Buy Stop, Sell Stop
11. Money Management
Position sizing, risk, and lot calculation
12. Backtesting
Strategy Tester, optimization, and results
13. Custom Indicators
Drawing buffers, plots, and colors
14. File Operations
Reading/writing files and logging
Build complete EAs and tools

Published Topics

Mql4 Event Handlers

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What Is MQL4?

MQL4 is the programming language for MetaTrader 4, used to create Expert Advisors and indicators for automated forex trading.

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MQL4 Syntax — Complete Guide

MQL4 syntax is C-like with variables, data types, operators, and control structures familiar to C programmers.

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Program Types — Complete Guide

MQL4 has three program types: Expert Advisors (start), Custom Indicators (start), and Scripts (start).

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Functions and Scope — Complete Guide

MQL4 functions support parameters, return values, and scope rules similar to C functions.

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Preprocessor Directives — Complete Guide

MQL4 preprocessor uses #define, #include, #property, and extern for constants, includes, and inputs.

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Technical Indicators — Complete Guide

MQL4 indicators like iMA, iRSI, iMACD, iBollingerBands return values directly for technical analysis.

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Expert Advisors — Complete Guide

Expert Advisors automate trading with event-driven execution on every price tick.

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Orders API — Complete Guide

MQL4 orders use OrderSend, OrderSelect, OrderModify, OrderClose, and OrderDelete for trade management.

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Pending Orders — Complete Guide

MQL4 pending orders include Buy Limit, Sell Limit, Buy Stop, Sell Stop with placement rules.

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Money Management — Complete Guide

MQL4 money management calculates position sizing, risk percentage, and lot size based on account balance.

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Backtesting — Complete Guide

MQL4 Strategy Tester tests EAs on historical data to evaluate performance before live trading.

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Custom Indicators — Complete Guide

MQL4 custom indicators draw on charts using buffer arrays with SetIndexBuffer and related functions.

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File Operations — Complete Guide

MQL4 file operations use FileOpen, FileWrite, FileRead, and FileClose for data persistence.

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Real-World Projects — Complete Guide

Learn Real. Step-by-step tutorial with practical examples.

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All 15 topics in MQL4 — Complete Guide are published.