Controlling MetaTrader Settings Through a Delphi DLL and WinAPI

Summary

The article explains how a Delphi DLL can operate MetaTrader’s user interface through WinAPI to change terminal settings. Its example addresses a limitation of MQL’s push notification function: the configured notification list is capped at four MetaQuotes IDs. The DLL locates the terminal and Options windows, navigates menus and tabs, identifies controls, and updates notification settings before the script sends a message.

The method uses window and child-window enumeration, menu commands, control handles, and messages to interact with the terminal without editing its process memory. The article includes example code and discusses finding controls across different interface languages. That language dependence, along with user intervention and implementation complexity, limits portability. The author advises using UI automation only when conventional methods cannot solve the problem, since mistakes may disrupt the terminal or cause a crash. The document describes a software integration technique rather than a trading strategy or evidence of trading performance.

Key ideas

• A Delphi DLL can use WinAPI to find MetaTrader windows and interact with their controls.
• The example changes notification settings so a script can send push messages to a selected ID list.
• Window titles, menu structure, control classes, and language differences affect how reliably the interface can be automated.
• UI-based automation avoids direct process-memory changes but still carries risks of terminal disruption or crashes.

Tags

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