EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Especificações descarregar pdf (Página 195)

CHAPTER 6: External Communication Tools Socket object 195

incoming connections and then return immediately. If there is a connection request, the call to poll()

would return another

Socket object containing the brand new connection. Use this connection object to

talk to the calling client; when finished, close the connection and discard the connection object.

Before a

Socket object is able to check for an incoming connection, it must be told to listen on a specific

port, like port 80 for HTTP requests. Do this by calling the

listen() method instead of the open()

method.

The following example is a very simple Web server. It listens on port 80, waiting until it detects an

incoming request. The HTTP header is discarded, and a dummy HTML page is transmitted to the caller.

conn = new Socket;

// listen on port 80

if (conn.listen (80)) {

// wait forever for a connection

var incoming;

do incoming = conn.poll();

while (incoming == null);

// discard the request

conn.read();

// Reply with a HTTP header

incoming.writeln ("HTTP/1.0 200 OK");

incoming.writeln ("Content-Type: text/html");

incoming.writeln();

// Transmit a dummy homepage

incoming.writeln ("<html><body><h1>Homepage</h1></body></html>");

// done!

incoming.close();

delete incoming;

}

Often, the remote endpoint terminates the connection after transmitting data. Therefore, there is a

connected property that contains true as long as the connection still exists. If the connected property

returns false, the connection is closed automatically.

On errors, the

error property of the Socket object contains a short message describing the type of the

error.

The

Socket object lets you easily implement software that talks to each other via the Internet. You could,

for example, let two Adobe applications exchange documents and data simply by writing and executing

JavaScript programs.

Chat server sample

The following sample code implements a very simple chat server. A chat client may connect to the chat

server, who is listening on port number 1234. The server responds with a welcome message and waits for

one line of input from the client. The client types some text and transmits it to the server who displays the

text and lets the user at the server computer type a line of text, which the client computer again displays.

This goes back and forth until either the server or the client computer types the word “bye”.

// A simple Chat server on port 1234

function chatServer() {

var tcp = new Socket;

// listen on port 1234

writeln ("Chat server listening on port 1234");

if (tcp.listen (1234)) {

for (;;) {

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