# websocket-sharp #

**websocket-sharp** is a C# implementation of WebSocket protocol client & server.

## Usage ##

### WebSocket Client ###

#### Step 1 ####

Required namespaces.

    using WebSocketSharp;
    using WebSocketSharp.Frame;

`WebSocket` class exists in `WebSocketSharp` namespace, WebSocket data frame resources (e.g. `WsFrame` class) exist in `WebSocketSharp.Frame` namespace.

#### Step 2 ####

Creating instance of `WebSocket` class.

    using (WebSocket ws = new WebSocket("ws://example.com"))
    {
      ...
    }

`WebSocket` class inherits `IDisposable` interface, so you can use `using` statement.

#### Step 3 ####

Setting `WebSocket` event handlers.

##### WebSocket.OnOpen event #####

`WebSocket.OnOpen` event is emitted immediately after WebSocket connection has been established.

    ws.OnOpen += (sender, e) =>
    {
      ...
    };

`e` has come across as `EventArgs.Empty`, so there is no operation on `e`.

##### WebSocket.OnMessage event #####

`WebSocket.OnMessage` event is emitted each time WebSocket data frame is received.

    ws.OnMessage += (sender, e) =>
    {
      ...
    };

**Type** of received WebSocket data frame is stored in `e.Type` (`WebSocketSharp.MessageEventArgs.Type`, its type is `WebSocketSharp.Frame.Opcode`), so you check it out and you determine which item you should operate.

    switch (e.Type)
    {
      case Opcode.TEXT:
        ...
        break;
      case Opcode.BINARY:
        ...
        break;
      default:
        break;
    }

If `e.Type` is `Opcode.TEXT`, you operate `e.Data` (`WebSocketSharp.MessageEventArgs.Data`, its type is `string`).

If `e.Type` is `Opcode.BINARY`, you operate `e.RawData` (`WebSocketSharp.MessageEventArgs.RawData`, its type is `byte[]`).

##### WebSocket.OnError event #####

`WebSocket.OnError` event is emitted when some error is occurred.

    ws.OnError += (sender, e) =>
    {
      ...
    };

Error message is stored in `e.Message` (`WebSocketSharp.ErrorEventArgs.Message`, its type is `string`), so you operate it.

##### WebSocket.OnClose event #####

`WebSocket.OnClose` event is emitted when WebSocket connection is closed.

    ws.OnClose += (sender, e) =>
    {
      ...
    };

Close status code is stored in `e.Code` (`WebSocketSharp.CloseEventArgs.Code`, its type is `WebSocketSharp.Frame.CloseStatusCode`) and reason of close is stored in `e.Reason` (`WebSocketSharp.CloseEventArgs.Reason`, its type is `string`), so you operate them.

#### Step 4 ####

Connecting to server using WebSocket.

    ws.Connect();

#### Step 5 ####

Sending data.

    ws.Send(data);

`WebSocket.Send` method is overloaded.

`data` types are `string`, `byte[]` and `FileInfo` class.

#### Step 6 ####

Closing WebSocket connection.

    ws.Close(code, reason);

If you want to close WebSocket connection explicitly, you can use `Close` method.

Type of `code` is `WebSocketSharp.Frame.CloseStatusCode`, type of `reason` is `string`.

`WebSocket.Close` method is overloaded (In addition `Close()` and `Close(code)` exist).

### WebSocket Server ###

#### Step 1 ####

Required namespaces.

    using WebSocketSharp;
    using WebSocketSharp.Frame;

Same as **WebSocket Client**.

#### Step 2 ####

Creating instance of `WebSocketServer` class.

    WebSocketServer wssv = new WebSocketServer("ws://example.com:4649");

If you set WebSocket url without port number, `WebSocketServer` set 80 or 443 to port number automatically.
So it is necessary to run with root permission.

    $ sudo mono example2.exe

#### Step 3 ####

Setting WebSocketServer event handlers.

##### WebSocketServer.OnConnection event #####

`WebSocketServer.OnConnection` event is emitted each time client makes a connection request.

    wssv.OnConnection += (sender, e) =>
    {
      ...
    };

`WebSocket` to communicate with client is stored in `e.Socket` (`WebSocketSharp.ConnectionEventArgs.Socket`, its type is `WebSocketSharp.WebSocket`), so you operate it.

    WebSocket ws = e.Socket;
    ws.OnMessage += (sender_, e_) =>
    {
      ...
    };

Same settings of `WebSocket` event handlers as **WebSocket Client**.

This WebSocket is server-side, so data is sent from server to client.

If you want to function as echo server that returns a data to client as it is received,

    // Echo
    ws.Send(e_.Data);

If you want to function as chat server that returns a data to all clients,

    // Chat
    wssv.Send(e_.Data);

##### WebSocketServer.OnError event #####

`WebSocketServer.OnError` event is emitted when some error is occurred.

    wssv.OnError += (sender, e) =>
    {
      ...
    };

Error message is stored in `e.Message` (`WebSocketSharp.ErrorEventArgs.Message`, its type is `string`), so you operate it.

#### Step 4 ####

Starting server.

    wssv.Start();

#### Step 5 ####

Sending data to all clients.

    wssv.Send(data);

`WebSocketServer.Send` method is overloaded.

`data` types are `string` and `byte[]`.

#### Step 6 ####

Stopping server.

    wssv.Stop();

## Examples ##

Examples of using **websocket-sharp**.

### Example ###

[Example] connects to the [Echo server] using the WebSocket.

### Example1 ###

[Example1] connects to the [Audio Data delivery server] using the WebSocket ([Example1] is only implemented a chat feature, still unfinished).

[Example1] uses [Json.NET].

### Example2 ###

[Example2] starts WebSocket server.

## Supported WebSocket Protocol ##

**websocket-sharp** supports **[RFC 6455]**.

- @**[branch: hybi-00]** supports older draft-ietf-hybi-thewebsocketprotocol-00 (**[hybi-00]**).
- @**[branch: draft75]** supports even more old draft-hixie-thewebsocketprotocol-75 (**[hixie-75]**).

## Reference ##

- **[The WebSocket Protocol]**
- **[The WebSocket API]**

Thx for translating to japanese.

- **[The WebSocket Protocol 日本語訳]**
- **[The WebSocket API 日本語訳]**

## License ##

Copyright © 2010 - 2012 sta.blockhead

Licensed under the **[MIT License]**.


[Audio Data delivery server]: http://agektmr.node-ninja.com:3000/
[branch: draft75]: https://github.com/sta/websocket-sharp/tree/draft75
[branch: hybi-00]: https://github.com/sta/websocket-sharp/tree/hybi-00
[Echo server]: http://www.websocket.org/echo.html
[Example]: https://github.com/sta/websocket-sharp/tree/master/Example
[Example1]: https://github.com/sta/websocket-sharp/tree/master/Example1
[Example2]: https://github.com/sta/websocket-sharp/tree/master/Example2
[hixie-75]: http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-75
[hybi-00]: http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-00
[Json.NET]: http://james.newtonking.com/projects/json-net.aspx
[MIT License]: http://www.opensource.org/licenses/mit-license.php
[RFC 6455]: http://tools.ietf.org/html/rfc6455
[The WebSocket API]: http://dev.w3.org/html5/websockets
[The WebSocket API 日本語訳]: http://www.hcn.zaq.ne.jp/___/WEB/WebSocket-ja.html
[The WebSocket Protocol]: http://tools.ietf.org/html/rfc6455
[The WebSocket Protocol 日本語訳]: http://www.hcn.zaq.ne.jp/___/WEB/RFC6455-ja.html