WebSocketServer MSDN Example

Question

I wrote a simple WebSocketServer, which I found out on the MSDN web-site. But it doesn't work. Can you explain me how I should to run this simple project, because I launch it but nothing happened.

Server

namespace WebSocketServer { class Program { static void Main(string[] args) { var task1 = Run(); // Console.ReadLine(); } public static async Task Run() { HttpListener s = new HttpListener(); s.Prefixes.Add("http://localhost:8000/ws"); s.Start(); var hc = await s.GetContextAsync(); if (!hc.Request.IsWebSocketRequest) { hc.Response.StatusCode = 400; hc.Response.Close(); return; } var wsc = await hc.AcceptWebSocketAsync(null); var ws = wsc.WebSocket; for (int i = 0; i != 10; ++i) { // await Task.Delay(20); var time = DateTime.Now.ToLongTimeString(); var buffer = Encoding.UTF8.GetBytes(time); var segment = new ArraySegment<byte>(buffer); await ws.SendAsync(segment, System.Net.WebSockets.WebSocketMessageType.Text, true, CancellationToken.None); } await ws.CloseAsync(WebSocketCloseStatus.NormalClosure, "Done", CancellationToken.None); } }

}

Client

namespace WebSocketClient { class Program { static void Main(string[] args) { var clientTask1 = Client(); Console.ReadLine(); } static async Task Client() { ClientWebSocket ws = new ClientWebSocket(); var uri = new Uri("ws://localhost:8000/ws/"); await ws.ConnectAsync(uri, CancellationToken.None); var buffer = new byte[1024]; while (true) { var segment = new ArraySegment<byte>(buffer); var result = await ws.ReceiveAsync(segment, CancellationToken.None); if (result.MessageType == WebSocketMessageType.Close) { await ws.CloseAsync(WebSocketCloseStatus.InvalidMessageType, "I don't do binary", CancellationToken.None); return; } int count = result.Count; while (!result.EndOfMessage) { if (count >= buffer.Length) { await ws.CloseAsync(WebSocketCloseStatus.InvalidPayloadData, "That's too long", CancellationToken.None); return; } segment = new ArraySegment<byte>(buffer, count, buffer.Length - count); result = await ws.ReceiveAsync(segment, CancellationToken.None); count += result.Count; } var message = Encoding.UTF8.GetString(buffer, 0, count); Console.WriteLine(">" + message); } } } }

And I need to create a simple web-site, which will be take some data (For example Time) from WebSocketServer and show it on this page. I wrote some code, but nothing is going on

<html> <body> <script type ="text/javascript"> var ws = new WebSocket("ws://localhost:8000/ws/"); ws.onmessage = function (args) { var time = args.data; }; </script> </body> </html>

What operating system are you using? (the HTTP.SYS required for web-sockets is win-8 upwards and similar server versions) And: are you running as admin? (note : you don't need to run such a server as an admin, but it is a quick way of checking that it isn't a port access ACL issue, since an admin account automatically has access) — Marc Gravell
– Marc Gravell, Commented Nov 18, 2013 at 10:04
yes you can - it is just TCP; however, not using the MS implementation, sadly: " However, the only public implementations of client and server WebSockets are supported on Windows 8 and Windows Server 2012. " — Marc Gravell
– Marc Gravell, Commented Nov 18, 2013 at 10:16
I do have a full web-sockets library that I've been meaning to open-source for ages; however, there are a few other open source clients/servers already available — Marc Gravell
– Marc Gravell, Commented Nov 18, 2013 at 10:17

Marc Gravell · Accepted Answer · 2013-11-18 10:09:43Z

At the server, Run is an async method; it will return to the caller as soon as it reaches the first await for which the result is not already completed. That means that your server will exit Main, and in the absence of any other primary (non-worker) threads, your server will terminate. The Console.ReadLine was there for a reason. Put it back:

static void Main(string[] args) { var task1 = Run(); Console.WriteLine("Press return to exit the server"); Console.ReadLine(); }

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