Adobe Flash Media Server 4 Server-Side ActionScript语言参考

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"FMS4帮助文档" Adobe Flash Media Server 4 (FMS4) 是一个强大的多媒体流媒体服务器，用于处理和分发实时音频、视频内容。本帮助文档主要聚焦于Server-Side ActionScript，这是一种专门针对Adobe Flash Media Server的脚本语言，允许开发者在服务器端执行代码，以实现更高级的功能和交互。 Server-Side ActionScript 4.0 语言参考是开发人员的重要工具，它提供了一个详细的指南，涵盖了语言的各种特性和用法。ActionScript是一种基于ECMAScript的编程语言，广泛应用于创建动态和交互式的Web内容。在FMS4中，Server-Side ActionScript允许开发者处理媒体流、管理用户权限、存储和检索数据、以及与其他服务器进行通信。此文档包含的信息可能包括但不限于以下几点： 1. **语法和数据类型**：ActionScript支持多种数据类型，如Number、String、Boolean等，并具有严谨的语法结构。了解这些基础是编写有效脚本的关键。 2. **类和对象**：ActionScript是面向对象的语言，文档会详细解释如何定义和使用类，以及如何通过实例化对象来操作它们。 3. **包和命名空间**：在FMS4中，包和命名空间用于组织代码，防止命名冲突，提高代码的可读性和可维护性。 4. **事件处理**：ActionScript中的事件驱动编程模型使得服务器可以响应用户的输入或其他服务器事件。文档会阐述如何注册事件监听器和处理事件。 5. **网络通信**：FMS4支持通过Socket和XMLSocket进行网络通信，允许服务器与客户端或其他服务器交换数据。 6. **媒体管理**：FMS4允许开发者处理RTMP（Real Time Messaging Protocol）流，包括播放、录制、直播等操作。 7. **安全和权限**：服务器端ActionScript可以实施安全策略，控制对媒体内容的访问，确保只有授权的用户可以访问特定的资源。 8. **错误处理**：文档还会讲解如何使用try-catch语句来捕获和处理运行时错误，保证程序的稳定运行。 9. **API参考**：FMS4提供了丰富的服务器端API，用于访问和控制服务器功能，这部分内容会详细介绍各个API函数的用途和用法。 10. **最佳实践和示例**：为了帮助开发者更好地理解和应用Server-Side ActionScript，文档通常会包含实用的示例代码和最佳实践指导。请注意，Adobe Flash Media Server 4.0的版权归Adobe Systems Incorporated所有，并且该帮助文档受到了Creative Commons Attribution Non-Commercial 3.0 License的保护。这意味着用户可以出于非商业目的复制、分发和传输此文档，但必须给予Adobe适当的归属，并包含条款通知。对于完整的许可信息，可以访问http://creativecommons.org/licenses/by-nc/3.0/us/。此外，文档中可能还提及其他商标，如Java（属于Sun Microsystems, Inc.）和Linux（注册商标）。这些商标的使用遵循各自的许可和规定。在实际开发过程中，结合这份文档和其他相关资源，开发者能够充分利用Server-Side ActionScript的能力，构建高效、可靠的Flash Media Server应用程序。

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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Adobe Flash Media Server 4 Server-Side ActionScript语言参考

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