MACROMEDIA FLASH COMMUNICATION SERVER MX-SERVER-SIDE COMMUNICATION ACTIONSCRIPT DICTIONARY Spezifikationen PDF herunterladen (Seite 158)

Chapter 480

NetStream.time

Although it is not explicitly stated in the Client-Side Communication ActionScript Dictionary, the

NetStream.time property returns a value that is internally accurate to a few hundredths of a

second, and not just whole seconds. Therefore, you can use this command to return values at a

more granular level. For example, you can multiply the value returned by

NetStream.time

by 1000 to determine the time to the nearest millisecond.

NetStream.bufferTime

For playback streams, the value returned by

NetStream.bufferTime specifies how much of the

stream Flash Communication Server will buffer before the Flash Player starts playing it back. For

example, if your recorded stream is 50 seconds long and your playback speed is twice as fast as

your download speed, you might consider setting this value to 25 seconds. You will thus be able

to play all of the stream without any stalls.

For publishing streams, this value specifies how long the outgoing queue can grow before the

Flash Player considers dropping messages; to determine how much data is currently in the queue,

use

NetStream.bufferLength. For a fast connection, the value returned by

NetStream.bufferLength will never approach the value of NetStream.bufferTime, but on a

slow connection it might.

Therefore, if you know your application is running over a slow connection and you want to

minimize dropped messages or stalled playback, you might want to use

NetStream.setBufferTime to increase the value of NetStream.bufferTime.

SharedObject object

Shared objects can be used for a wide number of purposes, and can be designed and used in a

number of ways. This section provides some items to consider as you begin using shared objects

in your applications.

SharedObject.onSync

Before attempting to work with a remote shared object, you should first check that

SharedObject.connect returned true, indicating a successful connection, and then wait until

you receive a result from the function you have assigned to SharedObject.onSync. If you fail to

do so, any changes you make to the object locally—before

SharedObject.onSync is invoked—

may be lost.

The

SharedObject.onSync handler is invoked when any of the SharedObject.data properties

of the remote shared object are changed, and also the first time a client uses the

SharedObject.getRemote command to connect to a remote shared object that is persistent

locally and/or on the server. In the latter case, all the properties of the object are set to empty

strings, and

SharedObject.onSync in invoked with the value of code set to "clear". Then

SharedObject.onSync is invoked again, this time with the value of code set to "change",

and the properties of the client’s instance of the remote shared object will be set to match those

on the server.

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