Adobe Flash Media Server 4.0实战教程与对象方法详解

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《Adobe Flash Media Server 4.0学习手册》是一份详尽的操作指南，专为深入理解Flash Media Server 4.0的Server-Side ActionScript编程而设计。该手册于2010年8月30日更新，版权归属于Adobe Systems Incorporate，所有权利保留。本手册是根据Creative Commons Attribution-NonCommercial 3.0许可证发行，允许用户在非商业用途下复制、分发和传输。使用此手册时，必须遵守两个主要规定：首先，使用者应明确指出Adobe是用户指南的所有者；其次，任何重新使用或分发此文档都要包含一条通知，说明使用是受这些条款约束的。最简单的方法是在分享时附上Creative Commons许可的链接，地址为http://creativecommons.org/licenses/by-nc/3.0/us/。书中详细讲解了ActionScript®语言在Flash® Media Server 4.0中的应用，这种语言是Adobe的重要技术之一，结合了ColdFusion、Flash和Flex等Adobe品牌的特性。ActionScript作为服务器端脚本语言，允许开发人员在服务器上处理数据流、管理媒体资源，并实现动态内容的创建与推送，为实时互动和多媒体应用程序提供了强大支持。此外，手册还可能涉及Java，作为一种广泛使用的编程语言，以及Linux，作为一种流行的开源操作系统，它们可能在Flash Media Server的后台运行环境中扮演着关键角色。通过学习这份指南，读者可以掌握如何利用Flash Media Server 4.0的先进功能，如流媒体分发、内容管理和服务器集成，以构建高效、交互式的网络应用。对于希望在媒体服务领域进行专业开发的人员来说，这是一份不可或缺的学习资源。

SERVER-SIDE ACTIONSCRIPT LANGUAGE REFERENCE FOR FLASH MEDIA SERVER 4.0

Server-Side ActionScript Language Reference

Last updated 8/30/2010

for (i = 0; i < application.clients.length; i++){

application.clients[i].call("serverUpdate");

}

application.config

Provides access to properties of the ApplicationObject element in the Application.xml configuration file. To access

properties that you set in the configuration file, use the

application.config property. For example, to set the value

of the

password element, use the code application.config.password.

Availability

Flash Media Server 2

Example

Use this sample section from an Application.xml file for this example:

<user_name>jdoe</user_name>

<dept_name>engineering</dept_name>

</config>

</ApplicationObject>

</JSEngine>

</Application>

The following lines of code access the user_name and dept_name properties:

trace("I am " + application.config.user_name + " and I work in the " +

application.config.dept_name + " department.");

trace("I am " + application.config["user_name"] + " and I work in the " +

application.config["dept_name"] + " department.");

The following code is sent to the application log file and the Administration Console:

I am jdoe and I work in the engineering department.

application.disconnect()

application.disconnect(clientObj)

Terminates a client connection to the application. When this method is called, NetConnection.onStatus() is

invoked on the client with

info.code set to "NetConnection.Connect.Closed". The

application.onDisconnect() handler is also invoked.

Availability

Flash Communication Server 1

Parameters

clientObj A Client object indicating the client to disconnect. The object must be a Client object from the

application.clients array.

SERVER-SIDE ACTIONSCRIPT LANGUAGE REFERENCE FOR FLASH MEDIA SERVER 4.0

Server-Side ActionScript Language Reference

Last updated 8/30/2010

Availability

Flash Communication Server 1

Example

application.onAppStart = function (){

trace ("*** sample_guestbook application start");

// Create a reference to a persistent shared object.

application.entries_so = SharedObject.get("entries_so", true);

// Prevent clients from updating the shared object.

application.entries_so.lock();

// Get the number of entries saved in the shared object

// and save it in application.lastEntry.

var maxprop = 0;

var soProperties = application.entries_so.getPropertyNames();

trace("soProperties:" + soProperties);

if (soProperties == null) {

application.lastEntry = 0;

} else {

for (var prop in soProperties) {

maxprop = Math.max (parseInt(prop), maxprop);

trace("maxprop " + maxprop);

}

application.lastEntry = maxprop+1;

}

// Allow clients to update the shared object.

application.entries_so.unlock();

trace("*** onAppStart called.");

};

application.onAppStop()

application.onAppStop = function (info){}

Invoked when the server is about to unload an application instance. You can use onAppStop() to flush the application

state or to prevent the application from being unloaded.

Define a function that is executed when the event handler is invoked. If the function returns true, the application is

unloaded. If the function returns

false, the application is not unloaded. If you don’t define a function for this event

handler, or if the return value is not a boolean value, the application is unloaded when the event is invoked.

The Flash Media Server application passes an information object to the application.onAppStop() event. You can

use Server-Side ActionScript to look at this information object to decide what to do in the function you define. You

can also use the

application.onAppStop() event to notify users before shutdown.

If you use the Administration Console or the Server Administration API to unload a Flash Media Server application,

application.onAppStop() is not invoked. Therefore you cannot use application.onAppStop() to tell users that

the application is exiting.

When an application doesn’t have incoming client connections, the server considers the application idle and unloads

it. To prevent this, define an

Application.onAppStop() handler that returns false.

SERVER-SIDE ACTIONSCRIPT LANGUAGE REFERENCE FOR FLASH MEDIA SERVER 4.0

Server-Side ActionScript Language Reference

Last updated 8/30/2010

Availability

Flash Communication Server 1

Parameters

info An Object, called an information object, with properties that explain why the application is about to stop

running. The information object has a code property and a level property.

Returns

The value returned by the function you define, if any, or null. To unload the application, return true or any non-

false value. To refuse to unload the application, return false.

Example

The following example flushes the entries_so shared object when the application stops:

application.onAppStop = function (info){

trace("*** onAppStop called.");

if (info=="Application.Shutdown"){

application.entries_so.flush();

}

application.onConnect()

application.onConnect = function (clientObj [, p1, ..., pN]){}

Invoked when NetConnection.connect() is called from the client. This handler is passed a Client object

representing the connecting client. Use the Client object to perform actions on the client in the handler. For example,

use this function to accept, reject, or redirect a client connection, perform authentication, define methods on the Client

object to be called remotely from

NetConnection.call(), and set the Client.readAccess and

Client.writeAccess properties to determine client access rights to server-side objects.

When performing authentication, all of the information required for authentication should be sent from the

NetConnection.connect() method to the onConnect() handler as parameters (p1..., pN).

If you don’t define an onConnect() handler, connections are accepted by default.

If there are several simultaneous connection requests for an application, the server serializes the requests so that only

one

application.onConnect() handler is executed at a time. It’s a good idea to write code for the

application.onConnect() function that is executed quickly to prevent a long connection time for clients.

Note: When you are using the version 2 component framework (that is, when you are loading the components.asc file in

your server-side script file), you must use the

application.onConnectAccept() method to accept client connections.

Availability

Flash Communication Server 1

Parameters

clientObj A Client object. This object contains information about the client that is connecting to the application.

Code property Level property Description

Application.Shutdown status The application instance is about to shut down.

Application.GC status The application instance is about to be destroyed by the server.

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