EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Especificações descarregar pdf (Página 194)

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External Communication Tools

ExtendScript offers tools for communicating with other computers or the Internet using standard

protocols.

X The Socket object supports low-level TCP connections. It is available in the following applications:

Z Adobe Bridge CS5

Z Adobe InDesign CS5

Z Adobe InCopy® CS5

Z Adobe After Effects® CS5

Z Adobe Photoshop CS5

Socket object

TCP connections are the basic transport layer of the Internet. Every time your Web browser connects to a

server and requests a new page, it opens a TCP connection to handle the request as well as the server’s

reply. The JavaScript

Socket object lets you connect to any server on the Internet and to exchange data

with this server.

The

Socket object provides basic functionality to connect to a remote computer over a TCP/IP network or

the Internet. It provides calls like

open() and close() to establish or to terminate a connection, and

read() or write() to transfer data. The listen() method establishes a simple Internet server; the server

uses the method

poll() to check for incoming connections.

Many of these connections are based on simple data exchange of ASCII data, while other protocols, like

the FTP protocol, are more complex and involve binary data. One of the simplest protocols is the HTTP

protocol. The following sample TCP/IP client connects to a WWW server (which listens on port 80); it then

sends a very simple HTTP GET request to obtain the home page of the WWW server, and then it reads the

reply, which is the home page together with a HTTP response header.

reply = "";

conn = new Socket;

// access Adobe’s home page

if (conn.open ("www.adobe.com:80")) {

// send a HTTP GET request

conn.write ("GET /index.html HTTP/1.0\n\n");

// and read the server’s reply

reply = conn.read(999999);

conn.close();

}

After executing this code, the variable reply contains the contents of the Adobe home page together

with an HTTP response header.

Establishing an Internet server is a bit more complicated. A typical server program sits and waits for

incoming connections, which it then processes. Usually, you would not want your application to run in an

endless loop, waiting for any incoming connection request. Therefore, you can ask a

Socket object for an

incoming connection by calling the

poll() method of a Socket object. This call would just check the

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