Creating a MetaTrader WebSocket Client with the Windows API
Summary
The article shows how to build a WebSocket client for MetaTrader 5 programs using the Windows WinHTTP API. It describes the connection sequence: initialize a session, connect to a server, issue an HTTP request, complete the WebSocket upgrade, and then send or receive messages. A client class wraps these operations and is demonstrated with the Deriv API to stream tick data into MetaTrader, including examples that create custom symbols with tick or bar history.
The article emphasizes that the sample client operates synchronously, so a receive call can block the executing thread while waiting for data. That behavior matters when integrating a feed into an Expert Advisor. The implementation also relies on native WebSocket support available only in newer Windows releases; older systems cited in the article are unsupported. The examples demonstrate connectivity and data handling, not trading signals, execution quality, or feed reliability under production conditions. Developers must account for blocking behavior, resource cleanup, and platform compatibility when adapting the approach.
Key ideas
- WinHTTP provides native Windows functions for establishing and managing WebSocket connections.
- A connection requires an HTTP request followed by a successful WebSocket upgrade before message exchange.
- The sample client consumes a market data API and uses incoming ticks to build MetaTrader custom symbols.
- Synchronous receive calls can block the calling thread until data arrives.
- Native WebSocket support depends on the Windows version, so the client has operating system compatibility limits.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.