ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Sockets
private var serverURL:String;
private var portNumber:int;
private var socket:Socket;
private var ta:TextArea;
private var state:int = 0;
The first variable, serverURL, contains the user-specified server address to connect to.
The second variable, portNumber, is the port number that the Telnet server is currently running on. By default, the
Telnet service runs on port 23.
The third variable, socket, is a Socket instance that attempts to connect to the server defined by the serverURL and
portNumber variables.
The fourth variable, ta, is a reference to a TextArea component instance on the Stage. This component is used to
display responses from the remote Telnet server, or any possible error messages.
The final variable, state, is a numeric value that is used to determine which options your Telnet client supports.
As you saw before, the Telnet class's constructor function is called by the connect() method in the main application file.
The Telnet constructor takes three parameters: server, port, and output. The server and port parameters specify
the server name and port number where the Telnet server is running. The final parameter, output, is a reference to a
TextArea component instance on the Stage where server output is displayed to users.
public function Telnet(server:String, port:int, output:TextArea)
{
serverURL = server;
portNumber = port;
ta = output;
socket = new Socket();
socket.addEventListener(Event.CONNECT, connectHandler);
socket.addEventListener(Event.CLOSE, closeHandler);
socket.addEventListener(ErrorEvent.ERROR, errorHandler);
socket.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
socket.addEventListener(ProgressEvent.SOCKET_DATA, dataHandler);
Security.loadPolicyFile("http://" + serverURL + "/crossdomain.xml");
try
{
msg("Trying to connect to " + serverURL + ":" + portNumber + "\n");
socket.connect(serverURL, portNumber);
}
catch (error:Error)
{
msg(error.message + "\n");
socket.close();
}
}
Writing data to a socket
Flash Player 9 and later, Adobe AIR 1.0 and later
To write data to a socket connection, you call any of the write methods in the Socket class. These write methods include
writeBoolean(), writeByte(), writeBytes(), writeDouble(), and others. Then, flush the data in the output
buffer using the flush() method. In the Telnet server, data is written to the socket connection using the
writeBytes() method which takes the byte array as a parameter and sends it to the output buffer. The
writeBytesToSocket() method is as follows:
Last updated 6/6/2012
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