MACROMEDIA FLASH COMMUNICATION SERVER MX-SERVER-SIDE COMMUNICATION ACTIONSCRIPT DICTIONARY Instrukcja Użytkownika Pobierz pdf (Strona 25)

Server-Side Communication ActionScript 25

Application.registerClass

Availability

Flash Communication Server MX.

Usage

application.registerClass(className, constructor)

Parameters

className The name of an ActionScript class.

constructor A constructor function used to create an object of a specific class type during

object deserialization. The name of the constructor function must be the same as

className.

During object serialization, the name of the constructor function is serialized as the object’s type.

To unregister the class, pass the value

null as the constructor parameter. Serialization is the

process of turning an object into something you can send to another computer over the network.

Returns

Nothing.

Description

Method; registers a constructor function that is used when deserializing an object of a certain class

type. If the constructor for a class is not registered, you cannot call the deserialized object’s

methods. This method is also used to unregister the constructor for a class. This is an advanced

use of the server and is necessary only when sending ActionScript objects between a client and a

server.

The client and the server communicate over a network connection. Therefore, if you use typed

objects, each side must have the prototype of the same objects they both use. In other words, both

the client-side and server-side ActionScript must define and declare the types of data they share so

that there is a clear, reciprocal relationship between an object, method, or property on the client

and the corresponding element on the server. You can use

application.registerClass to

class.

Constructor functions should be used to initialize properties and methods; they should not be

used for executing server code. Constructor functions are called automatically when messages are

received from the client and need to be “safe” in case they are executed by a malicious client. You

shouldn’t define procedures that could result in negative situations such as filling up the hard disk

or consuming the processor.

The constructor function is called before the object’s properties are set. A class can define an

onInitialize method, which is called after the object has been initialized with all its properties.

You can use this method to process data after an object is deserialized.

If you register a class that has its prototype set to another class, you must set the prototype

constructor back to the original class after setting the prototype. The second example below

illustrates this point.

Note: Client-side classes must be defined as function function_name(){}, as shown in the following examples.

If not defined in the correct way, application.registerClass will not properly identify the class when an instance of it is

passed from the client to the server, and an error will be returned.

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