SharedObject class

Availability
Flash Player 6.

Description
Shared objects are powerful: They offer real-time data sharing between objects that are persistent on the user’s computer. You can consider local shared objects as cookies.

You can use local shared objects to maintain local persistence. For example, you can call SharedObject.getLocal() to create a shared object, such as a calculator with memory, in the player. Because the shared object is locally persistent, Flash saves its data attributes on the user’s computer when the SWF file ends. The next time the SWF file runs, the calculator will display the values it had when the SWF file ended. Alternatively, if you set the shared object’s properties to null before the SWF file ends, the calculator opens without any prior values the next time the SWF file runs.

To create a local shared object, use the following syntax:

// Create a local shared object
var so:SharedObject = SharedObject.getLocal(“foo”);

Local disk space considerations

Local shared objects are always persistent on the client, depending on available memory and disk space.

By default, Flash can save locally persistent remote shared objects as large as 100K. When you try to save a larger object, Flash Player shows the Local Storage dialog box, which lets the user allow or deny local storage for the domain that is requesting access. (Ensure that your Stage size is at least 215 x 138 pixels; this is the minimum size Flash requires to display the dialog box.)

If the user clicks Allow, the object is saved and SharedObject.onStatus is invoked with a code property of SharedObject.Flush.Success; if the user clicks Deny, the object is not saved and SharedObject.onStatus is invoked with a code property of SharedObject.Flush.Failed.

The user can also specify permanent local storage settings for a particular domain by right-clicking (Windows) or Control-clicking (Macintosh) while a SWF file is running, selecting Settings, and then opening the Local Storage panel.

You can’t use ActionScript to specify local storage settings for a user, but you can display the Local Storage panel for the user by using System.showSettings(1).

The following list summarizes how the user’s disk space choices interact with shared objects:

If the user selects Never, objects are not saved locally and all SharedObject.flush() commands issued for the object return false.
If the user selects Unlimited (moves the slider all the way to the right), objects are saved locally, as available disk space allows.
If the user selects None (moves the slider all the way to the left), all SharedObject.flush() commands issued for the object return “pending”, and the player asks the user if additional disk space can be allotted to make room for the object.
If the user selects 10K, 100K, 1 MB, or 10 MB, objects are saved locally and SharedObject.flush() returns true if the object fits within the specified amount of space. If more space is needed, SharedObject.flush() returns “pending”, and the player asks the user if additional disk space can be allotted to make room for the object.
Additionally, if the user selects a value that is less than the amount of disk space currently being used for locally persistent data, the player warns the user that any locally saved shared objects will be deleted.

Note: There is no size limit in Flash Player that runs from the authoring environment.

Method summary for the SharedObject class
SharedObject.clear()
– Purges all the data from the shared object and deletes the shared object from the disk.

SharedObject.flush()
– Immediately writes a locally persistent shared object to a local file.

SharedObject.getLocal()
– Returns a reference to a locally persistent shared object that is available only to the current client.

SharedObject.getSize()
– Gets the current size of the shared object, in bytes.

Property summary for the SharedObject class
SharedObject.dataProperty
– The collection of attributes assigned to the data property of the object; these attributes can be shared and/or stored.

Event handler summary for the SharedObject classEvent handler SharedObject.onStatus
– Invoked every time an error, warning, or informational note is posted for a shared object.

Constructor for the SharedObject class
For information on creating local shared objects, see SharedObject.getLocal().

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link to macromedia livedocs

*sharedObject의 Data는 nested object 형태로 저장된다.
*아래의 Action Script는 로컬 디렉토리의 최상위에 LSO(local shared object) file을 위치시킨다
id_so = sharedObject.getLocal(“id”, “/”);
*System.showSettings() Method를 통해 플래시 플레이어의 설정 창을 임의로 조작하는 것이 가능하다. 0,1,2,3의 paremeter를 통해 각각의 탭에 접근하는 것이 가능하다.