Socket.IO / Objective C Library

Interface to communicate between Objective C and Socket.IO with the help of websockets or Long-Polling. Originally based on fpotter's socketio-cocoa it uses other libraries/classes like

• SocketRocket Look here for further instructions how to use/install SocketRocket.

JSON serialization can be provided by SBJson (json-framework), JSONKit or by Foundation in OS X 10.7/iOS 5.0. These are selected at runtime and introduce no source-level dependencies.

• json-framework (optional)
• JSONKit (optional)

Requirements

As of version 0.4, this library requires at least OS X 10.7 or iOS 5.0.

Non-ARC version

If you're old school - there's still the non-ARC version for you. This version (the non-ARC one) is out-of-date and won't be maintained any further (at least not by me).

Usage

The easiest way to connect to your Socket.IO / node.js server is

SocketIO *socketIO = [[SocketIO alloc] initWithDelegate:self];
[socketIO connectToHost:@"localhost" onPort:3000];

If required, additional parameters can be included in the handshake by adding an NSDictionary to the withParams option:

[socketIO connectToHost:@"localhost"
                 onPort:3000
             withParams:[NSDictionary dictionaryWithObjectsAndKeys:@"1234", @"auth_token", nil]
];

A namespace can also be defined in the connection details:

[socketIO connectToHost:@"localhost" onPort:3000 withParams:nil withNamespace:@"/users"];

There are different methods to send data to the server

- (void) sendMessage:(NSString *)data;
- (void) sendMessage:(NSString *)data withAcknowledge:(SocketIOCallback)function;
- (void) sendJSON:(NSDictionary *)data;
- (void) sendJSON:(NSDictionary *)data withAcknowledge:(SocketIOCallback)function;
- (void) sendEvent:(NSString *)eventName withData:(NSDictionary *)data;
- (void) sendEvent:(NSString *)eventName withData:(NSDictionary *)data andAcknowledge:(SocketIOCallback)function;

So you could send a normal Message like this

[socketIO sendMessage:@"hello world"];

or an Event (including some data) like this

NSMutableDictionary *dict = [NSMutableDictionary dictionary];
[dict setObject:@"test1" forKey:@"key1"];
[dict setObject:@"test2" forKey:@"key2"];

[socketIO sendEvent:@"welcome" withData:dict];

If you want the server to acknowledge your Message/Event you would also pass a SocketIOCallback block

SocketIOCallback cb = ^(id argsData) {
    NSDictionary *response = argsData;
    // do something with response
};
[socketIO sendEvent:@"welcomeAck" withData:dict andAcknowledge:cb];

All delegate methods are optional - you could implement the following

- (void) socketIODidConnect:(SocketIO *)socket;
- (void) socketIODidDisconnect:(SocketIO *)socket; // deprecated
- (void) socketIODidDisconnect:(SocketIO *)socket disconnectedWithError:(NSError *)error;
- (void) socketIO:(SocketIO *)socket didReceiveMessage:(SocketIOPacket *)packet;
- (void) socketIO:(SocketIO *)socket didReceiveJSON:(SocketIOPacket *)packet;
- (void) socketIO:(SocketIO *)socket didReceiveEvent:(SocketIOPacket *)packet;
- (void) socketIO:(SocketIO *)socket didSendMessage:(SocketIOPacket *)packet;
- (void) socketIO:(SocketIO *)socket onError:(NSError *)error;

These two callbacks are deprecated - please don't use them anymore - they will be removed in upcoming releases:

- (void) socketIOHandshakeFailed:(SocketIO *)socket;
- (void) socketIO:(SocketIO *)socket failedToConnectWithError:(NSError *)error;

To process an incoming Message just

- (void) socketIO:(SocketIO *)socket didReceiveMessage:(SocketIOPacket *)packet
{
    NSLog(@"didReceiveMessage() >>> data: %@", packet.data);
}

Authors

Initial project by Philipp Kyeck http://beta-interactive.de.
Namespace support by Sam Lown sam@cabify.com at Cabify.
SSL support by kayleg https://github.com/kayleg.
Different Socket Libraries + Error Handling by taiyangc https://github.com/taiyangc.

License

(The MIT License)

Copyright (c) 2011-13 Philipp Kyeck http://beta-interactive.de

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.