Building a Cross-Platform Trading Request Object for MetaTrader

Summary

This installment describes the first layer of a MetaTrader trading library: a base object that sends trading requests through a common interface for MT4 and MT5. Its purpose is to hide platform differences from higher-level code. The object assumes request parameters have already been checked; parameter validation belongs to a later base trading class. It also provides ticket-based selection of positions and orders, planned to move into that later layer.

The article outlines supporting pieces such as logging levels, localized error messages, and helper functions for mapping position directions to order types, including the opposite type needed when closing a position in MT5. It describes connecting symbol-level trading objects to the library's engine and exercising them with a test EA and panel controls. This is an implementation tutorial, not a trading strategy or performance study. The broader work of validating requests, interpreting server return codes, retrying rejected requests, and managing market-specific constraints is identified as future development.

Key ideas

• A shared trading object can present a unified request interface across MetaTrader 4 and MetaTrader 5.
• The described object sends requests with parameters assumed to be valid; validation is assigned to a later class.
• Ticket-based position and order selection is included in this layer temporarily.
• Logging, return-message infrastructure, and order-type conversion support trade request handling.
• The article tests library functionality with a panel-driven EA and leaves request validation and retry policies for later installments.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.