mql5-skills/skills/mql5/references/docs/01-constants/0176-constants-structures.md

Data Structures

MQL5 Language offers 12 predefined structures:

• MqlDateTime is intended for working with date and time;

• MqlParam can send input parameters when creating a handle of the indicator using the IndicatorCreate() function;

• MqlRates is intended for manipulating the historical data, it contains information about the price, volume and spread;

• MqlBookInfo is intended for obtaining information about the Depth of Market;

• MqlTradeRequest is used for creating a trade request for trade operations;

• MqlTradeCheckResult is intended for checking the prepared trade request before sending it;

• MqlTradeResult contains a trade server reply to a trade request, sent by OrderSend() function;

• MqlTradeTransaction contains description of a trade transaction;

• MqlTick is designed for fast retrieval of the most requested information about current prices.

• Economic calendar structures are used to obtain data on the economic calendar events sent to the MetaTrader 5 platform in real time. Economic calendar functions allow analyzing macroeconomic parameters immediately after new reports are released, since relevant values are broadcast directly from the source with no delay.