MACROMEDIA FLASH MEDIA SERVER 2-SERVER-SIDE ACTIONSCRIPT... Manuale di servizio

Server-Side ActionScript Language

Reference

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Acknowledgments

Project Management: Suzanne Smith

Writing: Jody Bleyle

Editing: Geta Carlson, Mary Ferguson, Mary Kraemer

Production and Editing Management: Patrice O’Neill, Rosana Francescato

Media Design and Production: Adam Barnett, Aaron Begley, Paul Benkman, John Francis, Mario Reynoso

Special thanks to Erick Vera and the Flash Media Server engineering and QA teams.

First Edition: October 2005

Macromedia, Inc.

601 Townsend St.

San Francisco, CA 94103

Contents

Chapter 1: Server-Side ActionScript Language Reference . . . . . . 5

Using server-side ActionScript . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Using naming conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ActionScript classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Global functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

ActionScript elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Application class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

clearInterval(). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Client class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

File class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

getGlobal() . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

load() . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

LoadVars class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Log class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

NetConnection class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102

protectObject() . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

setAttributes() . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

setInterval() . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

SharedObject class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

SOAPCall class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140

SOAPFault class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142

Stream class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144

trace() . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

WebService class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162

XML class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .166

XMLSocket class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218

XMLStreams class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227

Appendix A: Server-Side Information Objects . . . . . . . . . . . . . 229

Application information objects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230

NetConnection information objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . .231

Stream information objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232

4Contents

CHAPTER 1

Server-Side ActionScript

Language Reference

Server-side ActionScript is a scripting language on the server that lets you develop efficient

and flexible client-server Macromedia Flash Media Server applications. For example, you can

use server-side ActionScript to control log-in procedures, control events in connected

Macromedia Flash applications, determine what users see in their Flash applications, and

communicate with other servers. You can also use server-side scripting to allow and disallow

users access to various server-side application resources and to allow users to update and share

information.

Server-side ActionScript is based on the ECMA-262 specification (ECMAScript 1.5), which

is derived from JavaScript and lets you access the core JavaScript server object model. Server-

side ActionScript provides global methods and classes and exposes a rich object model for

developing media applications. You can also create classes, properties, and methods. This

dictionary provides detailed information about the classes and their properties, methods, and

events.

Client-side ActionScript is based on the ECMA-262 specification but deviates from the

specification in several places. Server-side ActionScript does not deviate from the ECMA-262

specification. For information about the relationship between server-side ActionScript and

client-side ActionScript, see Developing Media Applications.

Using server-side ActionScript

To use server-side ActionScript with a Flash Media Server application, you write the code, add

the script file to the appropriate server directory, and run the SWF file that connects to the

server. To understand the architecture of Flash Media Server and its applications, see

Developing Media Applications.

6 Server-Side ActionScript Language Reference

Create the server-side ActionScript file and name it main.asc. All ActionScript code that is

embedded in the script file and not in a function body executes once when the application is

loaded but before the application.onAppStart event handler is called.

To install and test the server-side ActionScript file:

1. Locate the Macromedia Flash Media Server /applications directory.

The default location of the /applications directory is in the Macromedia Flash Media

Server product installation directory.

2. Your server-side script file must be named main.asc, main.js, registered_app_name.asc, or

registered_app_name.js.

3. Create a subdirectory in the /applications directory called appName, where appName is a

name you choose as the filename of your Flash Media Server application. You must pass

this name as a parameter to the NetConnection.connect() method in the client-side

ActionScript.

NOTE

You can name your server-side ActionScript file app_name, where app_name is the

name of your application’s directory, and save it with a file extension of .asc or .js. Also,

any double-byte characters (including characters of all Asian languages) in the server-

side ActionScript file must be UTF-8-encoded. For more information on server-side

script files, see

Developing Media Applications

NOTE

For large-scale applications, you may need to use multiple server-side script files. You

can use the Flash Media Server archive compiler utility to deploy those files as a

package from a single location. For more information, see “

Archiving and compiling

server-side script files

” in

Developing Media Applications

NOTE

Server-side scripts also have a secure loading phase, during which critical code can be

loaded before the main application loading phase. Server-side scripts also let you create

protected objects

; these are objects whose methods and data cannot be inspected or

manipulated. These two features allow you to implement

system calls

that protect critical

data and functions. For more information, see

“Implementing secure system objects”

Developing Media Applications

NOTE

If you did not accept the default installation settings and you aren’t sure where the

/application directory is located, the location is specified in the AppsDir tag of the

Vhost.xml file, which is located at /Flash Media Server /conf/defaultRoot/

defaultVhost. For information about configuring a different application directory, see

Managing Flash Media Server. Although your SWF and HTML files should be

published under a web server directory, your server-side ASC files, your audio/video

FLV files, and your ActionScript FLA source files should not be accessible to a user

browsing your website.

Using naming conventions 7

4. Place the main.asc file in the appName directory or in a subdirectory called scripts in the

appName directory.

5. Open the Flash application (the SWF file) in a browser or in the stand-alone Flash Player.

The SWF file must contain ActionScript code that passes appName to the connect

method of the NetConnection class, as shown in the following example:

nc = new NetConnection();

nc.connect("rtmp://flashcomsvr.mydomain.com/myFlashComAppName");

Using naming conventions

When you write server-side ActionScript code, there are certain naming conventions that you

must use to name your applications, methods, properties, and variables. These rules let you

logically identify objects so your code executes properly.

Naming applications

Flash Media Server application names must follow the Uniform Resource Identifier (URI)

RFC 2396 convention. This convention supports a hierarchical naming system where a

forward slash (/) separates the elements in the hierarchy. The first element specifies the

application name. The element following the application name specifies the application

instance name. Each instance of the application has its own script environment.

Specifying instances

By specifying a unique application instance name after an application name, you can run

multiple instances of a single application. For example, rtmp:/support/session215 specifies a

customer support application named “support” and refers to a specific session of that

application named “session215”. All users who connect to the same instance name can

communicate with each other by referencing the same streams or shared objects.

Using JavaScript syntax

You must follow all syntax rules of JavaScript. For example, JavaScript is case-sensitive and

does not allow punctuation other than underscores (_) and dollar signs ($) in names. You can

use numbers in names, but names cannot begin with a number.

NOTE

You can use the management console to check if the application loaded

successfully.

8 Server-Side ActionScript Language Reference

Avoiding reserved commands

Flash Media Server has reserved commands that you cannot use in a script. These commands

are either methods that belong to the client-side NetConnection class or methods that belong

to the server-side Client class. This means that if you have a NetConnection object on the

client (player), you cannot make the following call:

nc.call("reservedCmd", ...);

In this call, "reservedCmd" is any of the following commands: closeStream, connect,

createStream, deleteStream, onStatus, pause, play, publish, receiveAudio,

receiveVideo, or seek. It also cannot be any of the server-side Client class methods:

getBandwidthLimit, setBandwidthLimit, getStats, and ping.

ActionScript classes

The following table lists all the classes in the Server-Side ActionScript Language Reference.

ActionScript class Description

Application class The Application class contains information about a Flash Media

Server application instance that lasts until the application instance

is unloaded.

Client class The Client class lets you handle each user, or

client

, connection to

a Flash Media Server application instance.

File class The File class lets applications write to the server’s file system.

LoadVars class The LoadVars class lets you load variables into a server-side script

from a remote or local location.

Log class The Log class lets you create a Log object that can be passed as

an optional argument to the Constructor for the WebService class.

NetConnection class The server-side NetConnection class lets you create a two-way

connection between a Flash Media Server application instance

and an application server, another Flash Media Server, or another

Flash Media Server application instance on the same server.

SharedObject class The Shared Object class lets you share data between multiple

client applications in real time.

SOAPCall class The SOAPCall class is the object type that is returned from all web

service calls.

SOAPFault class The SOAPFault class is the object type of the error object returned

to WebService.onFault and SOAPCall.onFault functions.

Global functions 9

Global functions

The following table lists all the global functions in the Server-Side ActionScript Language

Reference.

Stream class The Stream class lets you handle each stream in a Flash Media

Server application.

WebService class The WebServices class lets you create and access a WSDL/

SOAP web service.

XML class The XML class lets you load, parse, send, build, and manipulate

XML document trees.

XMLSocket class The XMLSocket class implements client sockets that let Flash

Media Server communicate with a server identified by an IP

address or domain name.

XMLStreams class The XMLStreams class is a variation of the XMLSocket class. It

has all the same methods, properties, and events, but it transmits

and receives data in fragments.

Global function Description

clearInterval() Cancels a time-out that was set with a call to the setInterval()

method.

getGlobal() Provides access to the global object while the secure.asc file is

load() Loads an ActionScript file in the main.asc file.

protectObject() Protects user-defined or built-in objects behind a C wrapper

object.

setAttributes() Lets you prevent certain methods and properties from being

enumerated, written, and deleted.

setInterval() Continually calls a function or method at a specified time interval

until the clearInterval() method is called.

trace() Evaluates an expression and displays the value.

ActionScript class Description

10 Server-Side ActionScript Language Reference

ActionScript elements

Entries in this document are alphabetical by class name and then by method, property, or

event handler name. The following table lists all classes, methods, properties, and event

handlers individually in alphabetical order.

ActionScript element See entry

acceptConnection Application.acceptConnection()

addHeader NetConnection.addHeader()

addRequestHeader LoadVars.addRequestHeader(), XML.addRequestHeader()

agent Client.agent

allowDebug Application.allowDebug

appendChild XML.appendChild()

attributes XML.attributes

autoCommit SharedObject.autoCommit

broadcastMsg Application.broadcastMsg()

bufferTime Stream.bufferTime

call Client.call(), NetConnection.call()

canAppend File.canAppend

canRead File.canRead

canReplace File.canReplace

canWrite File.canWrite

childNodes XML.childNodes

clear SharedObject.clear(), Stream.clear()

clearInterval clearInterval()

clearSharedObject Application.clearSharedObjects()

clearStreams Application.clearStreams()

clients Application.clients

cloneNode XML.cloneNode()

close NetConnection.close(), File.close(),

SharedObject.close(), XMLSocket.close()

"commandName" Client."commandName"

commit SharedObject.commit()

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