MACROMEDIA FLASH COMMUNICATION SERVER MX-SERVER-SIDE COMMUNICATION ACTIONSCRIPT DICTIONARY Specifikace stáhnout pdf (Strana 89)

About Flash Communication Server 11

Flash Communication Server objects

As mentioned earlier, Flash Communication Server provides two application program interfaces

(APIs): a client-side API and a server-side API. The client-side API provides the following objects:

Camera, Microphone, NetConnection, NetStream, SharedObject, and Video. For more

information on using these objects, see the Client-Side Communication ActionScript Dictionary.

The server-side API provides the following objects: Application, Client, NetConnection,

SharedObject, and Stream. For more information on using these objects, see the Server-Side

Communication ActionScript Dictionary.

As you can see, some objects have the same name in both APIs, such as NetConnection. However,

a client-side object and a server-side object of the same name don’t provide the same functionality.

In addition, some client-side objects have server-side counterparts, but others do not. The

following sections briefly describe each client-side and server-side object, then explain how some

of them work together to allow client-server communications.

Client-side objects

These objects are used only in client-side ActionScript. For more information about these objects,

see the Client-Side Communication ActionScript Dictionary.

Camera object The client-side Camera object lets you capture video from a video camera

attached to the computer that is running the Flash Player. When used with the Flash

Communication Server, this object lets you transmit, display, and optionally record the video

being captured. With these capabilities, you can develop communication applications such as

videoconferencing, instant messaging with video, and so on.

You can also use a Camera object without a server (for example, to view a video feed from a

webcam attached to your local system).

Microphone object The client-side Microphone object lets you capture audio from a

microphone attached to the computer that is running the Flash Player. When used with the Flash

Communication Server, this object lets you transmit, play, and optionally record the audio being

captured. With these capabilities, you can develop communication applications such as instant

messaging with audio, recording presentations so others can replay them at a later date, and so on.

You can also use a Microphone object without a server—for example, to transmit sound from

your microphone through the speakers on your local system.

NetConnection object The client-side NetConnection object allows the Flash client to open a

TCP socket on the Flash Communication Server for continuous exchange of data using the Real-

Time Messaging Protocol (RTMP). You can also use the NetConnection object to connect to an

application server (see Chapter 5, “Connecting through Flash Remoting,” on page 85), but this

manual focuses on using the NetConnection object to communicate with the Flash

Communication Server.

NetStream object The client-side NetStream object opens a one-way streaming connection

between the Flash Player and the Flash Communication Server through a connection made

available by a client-side NetConnection object. A NetStream object is like a channel inside a

NetConnection; this channel can either publish audio, video, and data, using the

NetStream.publish method, or subscribe to a stream and receive data, using the

NetStream.play method. You can publish or play live (real-time) data and play previously

recorded data. Multiple clients can play a given stream, but a stream can have only one publisher

at a time. For information about the creation and storage of recorded streams on the server, see

“Recorded stream files” on page 68.

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MACROMEDIA FLASH COMMUNICATION SERVER MX-SERVER-SIDE COMMUNICATION ACTIONSCRIPT DICTIONARY Specifikace Strana 89

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