1. What Is the MQL5 “invalid volume” Error? 1.1 Definition of the invalid volume error The “invalid volume” error in MQL5 occurs when the lot size (volume) specified for an order does not match the br […]
1. What “trade context busy” Means in MQL5 1.1 Meaning of the Error: trade context busy trade context busy is an error that means a trade operation in MQL5, such as placing or closing an order, is alr […]
1. What Are OnInit and OnDeinit in MQL5? In MQL5, OnInit and OnDeinit are the most basic functions for controlling the lifecycle of an EA (Expert Advisor) or indicator, from startup to shutdown.In sho […]
1. What Is OnTick in MQL5? 1.1 Basic Role of OnTick OnTick is one of the most important functions when developing an EA (Expert Advisor: automated trading program) in MQL5.This function is an event fu […]
1. What Is the Basic Structure of an MQL5 EA? When you build an automated trading program in MQL5, also called an EA or Expert Advisor, the first thing to understand is the EA basic structure.An EA do […]
1. What Is CopyTime in MQL5? In MQL5, CopyTime is a function used to get the time information of bars, or candlesticks, for a specified symbol and timeframe.Here, “time” means the start ti […]
1. What Is CopyRates in MQL5? 1.1 Basic Concept of CopyRates CopyRates is an MQL5 function used to retrieve price data, also known as OHLC data.OHLC refers to the following four price values. Item Mea […]
1. What Is SymbolInfo in MQL5? In MQL5, SymbolInfo is an API for retrieving information about financial instruments handled in MetaTrader 5, such as currency pairs, indices, and CFDs.Expert Advisors ( […]
1. What Is ArrayInitialize in MQL5? 1.1 Basic concept of ArrayInitialize ArrayInitialize is an MQL5 function used to initialize all elements of an array with the same value at once.An array is a data […]
1. What Is ArrayResize in MQL5? 1.1 The role of ArrayResize ArrayResize is a function used to change the size, or number of elements, of an array in MQL5.In MQL5, the amount of data often changes whil […]