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September 12

WebSocket question

At work I'm working on a system consisting of a web application and an independent desktop application. Both run on Windows 10, and the desktop application is written in .NET Framework C# while the web application runs .NET Framework C# on the back end and HTML and JavaScript on the front end.

The two applications in the system communicate via WebSockets. I've managed to have the web application open a WebSocket to the desktop application via JavaScript, and the desktop application then receives a message and acts on it.

But how can I do it the other way? I also need the desktop application to be the one to initiate the message passing and the JavaScript on the web application then receives the message. How can this be done? JIP | Talk 13:28, 12 September 2020 (UTC)[reply]

@JIP, WebSockets are bi-directional, so you can just get the server (in this case the desktop) to send a message and handle this in the webapp via the .onmessage event (i.e. exampleSocket.onmessage = function (event) { }). This all varies on whatever socket server library you're using in .NET, but they all should include a send function. You may find https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API useful. Hope this helps :) Ed talk! 18:22, 12 September 2020 (UTC)[reply]