Websockets convert byte[] to string

Question

I have the following code:

            Console.WriteLine("New Socket connection opened");
            var buffer = new byte[1024 * 4];
            WebSocketReceiveResult result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
            while (!result.CloseStatus.HasValue)
            {
                Console.WriteLine("New message received : "+ Encoding.UTF8.GetString(buffer));
            }

When I send Hello my client, I can see Hello????????????? on the console. Clearly, it means I have a buffer of size 1024 * 4, of which, the first few bytes are taken by Hello. How do I trim my String (eventually, I wanto pass JSON from my client to the server).

learn.microsoft.com/en-us/aspnet/core/fundamentals/… - all I am trying to do is Console.WriteLine() the message — Amarsh
– Amarsh, Commented Sep 14, 2018 at 2:59

TheGeneral · Accepted Answer · 2018-09-14 03:03:43Z

Basically John answered this

WebSocketReceiveResult.Count Property

Indicates the number of bytes that the WebSocket received.

Count can be 0 in two cases:

The WebSocket received an empty message. In this case the CloseStatus property is None.

The WebSocket received a close message from the remote endpoint. In this case, the CloseStatus property is set to a value other than None.

GetString(Byte[], Int32, Int32)

public virtual string GetString (byte[] bytes, int index, int count);

When overridden in a derived class, decodes a sequence of bytes from the specified byte array into a string.

bytes Byte[] The byte array containing the sequence of bytes to decode.

index Int32 The index of the first byte to decode.

count Int32 The number of bytes to decode.

So you will need something like this

Console.WriteLine("New message received : "+ Encoding.UTF8.GetString(buffer,0,Result.Count));

However, and its a big however. There is more to go wrong, and i would seriously suggest getting a good WebSocket tutorial and some bullet proof (typical) designs

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