Using MQL5 Standard Trade Classes in Expert Advisors
Summary
This programming guide explains how MQL5 Standard Trade classes can support Expert Advisors that inspect account and symbol properties, check margin, manage positions and pending orders, and retrieve order and deal history. It describes classes for account information, symbols, orders, positions, and deals, with examples of the kinds of data and operations each exposes.
The article demonstrates how these library components fit into an EA workflow, including checking whether trading is allowed, refreshing quotes, estimating required margin, and modifying or closing trades when conditions are met. It also shows how to examine historical deal details. The examples illustrate API use rather than a tested trading strategy: no systematic performance results are provided, and the functions an EA needs will depend on its strategy. Readers are encouraged to consult the function descriptions and adapt the library usage to their own requirements.
Key ideas
- MQL5 Standard Trade classes provide reusable interfaces for account, symbol, order, position, and deal information.
- Account methods can check trading permissions, balance, profit, free margin, and estimated order costs.
- Symbol methods help an EA refresh quotes and inspect market properties such as spread and volume.
- Trade classes support operations such as placing or deleting pending orders and modifying or closing positions.
- The examples explain platform functionality and do not establish the profitability of any trading strategy.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.