Flash / Flex / ActionScript/Network/Socket

Close the Socket in Finally branch

 
package
{
    import flash.display.Sprite;
    import flash.errors.IOError;
    import flash.net.Socket;
    public class Main extends Sprite
    {
        public function Main()
        {
            try
            {
                var s:Socket = new Socket();
                s.connect("http://www.cmu.edu/", 80);
            } catch(error:IOError) {
                trace("I/O Error:", error.message);
            } catch(error:SecurityError) {
                trace("Security Error:", error.message);
            } finally {
                s.close();
            }
        }
    }
}

Connecting to a Socket Server

 
package {
  import flash.display.Sprite;
  import flash.events.*;
  import flash.net.Socket;
  public class Main extends Sprite {
  
    private var socket:Socket;
  
    public function Main(  ) {
      socket = new Socket(  );
      
      socket.addEventListener( Event.CONNECT, onConnect );
      
      socket.connect( "localhost", 2900 );
    }
    
    private function onConnect( event:Event ):void {
      trace( "The socket is now connected..." );  
    }
    
  }
}

Handling a Built-in Exception

 
package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var socket:Socket = new Socket(  );
        
        try {
          socket.connect("example.ru", userPort);
        } catch (e:SecurityError) {
        }
    }
  }
}

Handling Asynchronous Errors: IOErrorEvent

 
package
{
    import flash.display.Sprite;
    import flash.net.Socket;
    import flash.events.Event;
    import flash.events.IOErrorEvent;
    public class Main extends Sprite
    {
        protected var sock:Socket = new Socket();
        public function Main()
        {
            super();
            sock.addEventListener(Event.CONNECT, onSocketOpen);
            sock.addEventListener(IOErrorEvent.IO_ERROR, onIOError);
            sock.connect("www.cmu.edu", 80);
        }
        protected function onSocketOpen(event:Event):void
        {
            trace("Connected succesfully!");
            sock.close();
        }
        protected function onIOError(event:IOErrorEvent):void
        {
            trace(event.text);
            //Error #2031: Socket Error. URL: www.cmu.edu
            sock.close();
        }
    }
}

Receiving Data

 
Socket read methods for various datatypes
package {
  import flash.display.Sprite;
  import flash.events.ProgressEvent;
  import flash.net.Socket;
  public class SocketExample extends Sprite {
  
    private var socket:Socket;
  
    public function SocketExample(  ) {
      socket = new Socket(  );
      
      socket.addEventListener( ProgressEvent.SOCKET_DATA, onSocketData );
      socket.connect( "localhost", 2900 );
    }
    private function onSocketData( event:ProgressEvent ):void {
      trace( "Socket received " + socket.bytesAvailable + " byte(s) of data:" );
      while ( socket.bytesAvailable ) {
        var data:int = socket.readByte(  );
        trace( data );
      }
    }
  }
}

Sending Data

 
package{
  import flash.display.Sprite;
  import flash.net.*;
  public class Main extends Sprite{
    public function Main(){
        var socket:Socket = new Socket(  );
        socket.writeMultiByte("example", "unicode");
        socket.writeUTFBytes("USER exampleUsername\n");
        
        socket.writeByte(1);
        socket.writeByte(5);
        socket.writeByte(4);
        socket.writeByte(8);
        socket.flush(  );
    }
  }
}