SharedObject  - AS3

Indicates the object on which callback methods are invoked. The default object is this. You can set the client property to another object, and callback methods will be invoked on that other object.

The collection of attributes assigned to the data property of the object; these attributes can be shared and stored. Each attribute can be an object of any ActionScript or JavaScript type — Array, Number, Boolean, ByteArray, XML, and so on. For example, the following lines assign values to various aspects of a shared object:

 var items_array:Array = new Array(101, 346, 483); var currentUserIsAdmin:Boolean = true; var currentUserName:String = "Ramona"; var my_so:SharedObject = SharedObject.getLocal("superfoo"); my_so.data.itemNumbers = items_array; my_so.data.adminPrivileges = currentUserIsAdmin; my_so.data.userName = currentUserName; for (var prop in my_so.data) { trace(prop+": "+my_so.data[prop]); } 

All attributes of a shared object's data property are saved if the object is persistent, and the shared object contains the following information:

 userName: Ramona adminPrivileges: true itemNumbers: 101,346,483 

Note: Do not assign values directly to the data property of a shared object, as in so.data = someValue; Flash Player ignores these assignments.

To delete attributes for local shared objects, use code such as delete so.data.attributeName; setting an attribute to null or undefined for a local shared object does not delete the attribute.

To create private values for a shared object — values that are available only to the client instance while the object is in use and are not stored with the object when it is closed — create properties that are not named data to store them, as shown in the following example:

 var my_so:SharedObject = SharedObject.getLocal("superfoo"); my_so.favoriteColor = "blue"; my_so.favoriteNightClub = "The Bluenote Tavern"; my_so.favoriteSong = "My World is Blue"; for (var prop in my_so) { trace(prop+": "+my_so[prop]); } 

The shared object contains the following data:

 favoriteSong: My World is Blue favoriteNightClub: The Bluenote Tavern favoriteColor: blue data: [object Object] 

For remote shared objects used with a server, all attributes of the data property are available to all clients connected to the shared object, and all attributes are saved if the object is persistent. If one client changes the value of an attribute, all clients now see the new value.

Related API Elements

The default object encoding (AMF version) for all local shared objects created in the SWF file. When local shared objects are written to disk, the SharedObject.defaultObjectEncoding property indicates which Action Message Format version should be used: the ActionScript 3.0 format (AMF3) or the ActionScript 1.0 or 2.0 format (AMF0).

For more information about object encoding, including the difference between encoding in local and remote shared objects, see the description of the objectEncoding property.

The default value of SharedObject.defaultObjectEncoding is set to use the ActionScript 3.0 format, AMF3. If you need to write local shared objects that ActionScript 2.0 or 1.0 SWF files can read, set SharedObject.defaultObjectEncoding to use the ActionScript 1.0 or ActionScript 2.0 format, flash.net.ObjectEncoding.AMF0, at the beginning of your script, before you create any local shared objects. All local shared objects created thereafter will use AMF0 encoding and can interact with older content. You cannot change the objectEncoding value of existing local shared objects by setting SharedObject.defaultObjectEncoding after the local shared objects have been created.

To set the object encoding on a per-object basis, rather than for all shared objects created by the SWF file, set the objectEncoding property of the local shared object instead.

Related API Elements

Specifies the number of times per second that a client's changes to a shared object are sent to the server.

Use this method when you want to control the amount of traffic between the client and the server. For example, if the connection between the client and server is relatively slow, you may want to set fps to a relatively low value. Conversely, if the client is connected to a multiuser application in which timing is important, you may want to set fps to a relatively high value.

Setting fps will trigger a sync event and update all changes to the server. If you only want to update the server manually, set fps to 0.

Changes are not sent to the server until the sync event has been dispatched. That is, if the response time from the server is slow, updates may be sent to the server less frequently than the value specified in this property.

The object encoding (AMF version) for this shared object. When a local shared object is written to disk, the objectEncoding property indicates which Action Message Format version should be used: the ActionScript 3.0 format (AMF3) or the ActionScript 1.0 or 2.0 format (AMF0).

Object encoding is handled differently depending if the shared object is local or remote.

• Local shared objects. You can get or set the value of the objectEncoding property for local shared objects. The value of objectEncoding affects what formatting is used for writing this local shared object. If this local shared object must be readable by ActionScript 2.0 or 1.0 SWF files, set objectEncoding to ObjectEncoding.AMF0. Even if object encoding is set to write AMF3, Flash Player can still read AMF0 local shared objects. That is, if you use the default value of this property, ObjectEncoding.AMF3, your SWF file can still read shared objects created by ActionScript 2.0 or 1.0 SWF files.
• Remote shared objects. When connected to the server, a remote shared object inherits its objectEncoding setting from the associated NetConnection instance (the instance used to connect to the remote shared object). When not connected to the server, a remote shared object inherits the defaultObjectEncoding setting from the associated NetConnection instance. Because the value of a remote shared object's objectEncoding property is determined by the NetConnection instance, this property is read-only for remote shared objects.

Related API Elements

Specifies whether or not local shared objects will be backed up on the iOS cloud backup service.

Specify true or false:

• true - Prevents all local shared objects from being backed up on the iOS backup cloud service.
• false (the default) - Local shared objects wil be backed up on the iOS backup cloud service.

This property applies only to local shared objects and is for iOS only.

The current size of the shared object, in bytes.

Flash calculates the size of a shared object by stepping through all of its data properties; the more data properties the object has, the longer it takes to estimate its size. Estimating object size can take significant processing time, so you may want to avoid using this method unless you have a specific need for it.

More examples

 import flash.net.SharedObject; // if these get copied or not var mySo:SharedObject = SharedObject.getLocal("thehobbit"); mySo.data.username = "bilbobaggins"; trace(mySo.size); // 55 

For local shared objects, purges all of the data and deletes the shared object from the disk. The reference to the shared object is still active, but its data properties are deleted.

For remote shared objects used with Flash Media Server, clear() disconnects the object and purges all of the data. If the shared object is locally persistent, this method also deletes the shared object from the disk. The reference to the shared object is still active, but its data properties are deleted.

 package { import flash.net.SharedObject; public class SharedObject_clear { private var hostName:String = "yourDomain"; private var username:String = "yourUsername"; public function SharedObject_clear() { var mySo:SharedObject = SharedObject.getLocal(hostName); if(mySo.data.username == null) { mySo.data.username = username; trace("set: " + mySo.data.username); // yourUsername } else { mySo.clear(); trace("cleared: " + mySo.data.username); // undefined } } } } 

Closes the connection between a remote shared object and the server. If a remote shared object is locally persistent, the user can make changes to the local copy of the object after this method is called. Any changes made to the local object are sent to the server the next time the user connects to the remote shared object.

Connects to a remote shared object on a server through a specified NetConnection object. Use this method after calling getRemote(). When a connection is successful, the sync event is dispatched.

Before attempting to work with a remote shared object, first check for any errors using a try..catch..finally statement. Then, listen for and handle the sync event before you make changes to the shared object. Any changes made locally — before the sync event is dispatched — might be lost.

Call the connect() method to connect to a remote shared object, for example:

 var myRemoteSO:SharedObject = SharedObject.getRemote("mo", myNC.uri, false); myRemoteSO.connect(myNC); 

Parameters

Related API Elements

Immediately writes a locally persistent shared object to a local file. If you don't use this method, Flash Player writes the shared object to a file when the shared object session ends — that is, when the SWF file is closed, when the shared object is garbage-collected because it no longer has any references to it, or when you call SharedObject.clear() or SharedObject.close().

If this method returns SharedObjectFlushStatus.PENDING, Flash Player displays a dialog box asking the user to increase the amount of disk space available to objects from this domain. To allow space for the shared object to grow when it is saved in the future, which avoids return values of PENDING, pass a value for minDiskSpace. When Flash Player tries to write the file, it looks for the number of bytes passed to minDiskSpace, instead of looking for enough space to save the shared object at its current size.

For example, if you expect a shared object to grow to a maximum size of 500 bytes, even though it might start out much smaller, pass 500 for minDiskSpace. If Flash asks the user to allot disk space for the shared object, it asks for 500 bytes. After the user allots the requested amount of space, Flash won't have to ask for more space on future attempts to flush the object (as long as its size doesn't exceed 500 bytes).

After the user responds to the dialog box, this method is called again. A netStatus event is dispatched with a code property of SharedObject.Flush.Success or SharedObject.Flush.Failed.

Parameters

More examples

Related API Elements

 package { import flash.net.SharedObject; public class SharedObject_flush { private var hostName:String = "yourDomain"; private var username:String = "yourUsername"; public function SharedObject_flush() { var mySo:SharedObject = SharedObject.getLocal(hostName); mySo.data.username = username; var flushResult:Object = mySo.flush(); trace("flushResult: " + flushResult); trace(mySo.data.username); // yourUsername } } } 

Returns a reference to a locally persistent shared object that is only available to the current client. If the shared object does not already exist, this method creates one. If any values passed to getLocal() are invalid or if the call fails, Flash Player throws an exception.

The following code shows how you assign the returned shared object reference to a variable:

var so:SharedObject = SharedObject.getLocal("savedData");

Note: If the user has chosen to never allow local storage for this domain, the object is not saved locally, even if a value for localPath is specified. The exception to this rule is local content. Local content can always write shared objects from third-party domains (domains other than the domain in the current browser address bar) to disk, even if writing of third-party shared objects to disk is disallowed.

To avoid name conflicts, Flash looks at the location of the SWF file creating the shared object. For example, if a SWF file at www.myCompany.com/apps/stockwatcher.swf creates a shared object named portfolio, that shared object does not conflict with another object named portfolio that was created by a SWF file at www.yourCompany.com/photoshoot.swf because the SWF files originate from different directories.

Although the localPath parameter is optional, you should give some thought to its use, especially if other SWF files need to access the shared object. If the data in the shared object is specific to one SWF file that will not be moved to another location, then use of the default value makes sense. If other SWF files need access to the shared object, or if the SWF file that creates the shared object will later be moved, then the value of this parameter affects how accessible the shared object will be. For example, if you create a shared object with localPath set to the default value of the full path to the SWF file, no other SWF file can access that shared object. If you later move the original SWF file to another location, not even that SWF file can access the data already stored in the shared object.

To avoid inadvertently restricting access to a shared object, use the localpath parameter. The most permissive approach is to set localPath to / (slash), which makes the shared object available to all SWF files in the domain, but increases the likelihood of name conflicts with other shared objects in the domain. A more restrictive approach is to append localPath with folder names that are in the full path to the SWF file. For example, for a portfolio shared object created by the SWF file at www.myCompany.com/apps/stockwatcher.swf, you could set the localPath parameter to /, /apps, or /apps/stockwatcher.swf. You must determine which approach provides optimal flexibility for your application.

When using this method, consider the following security model:

• You cannot access shared objects across sandbox boundaries.
• Users can restrict shared object access by using the Flash Player Settings dialog box or the Settings Manager. By default, an application can create shared objects of up 100 KB of data per domain. Administrators and users can also place restrictions on the ability to write to the file system.

Suppose you publish SWF file content to be played back as local files (either locally installed SWF files or EXE files), and you need to access a specific shared object from more than one local SWF file. In this situation, be aware that for local files, two different locations might be used to store shared objects. The domain that is used depends on the security permissions granted to the local file that created the shared object. Local files can have three different levels of permissions:

1. Access to the local filesystem only.
2. Access to the network only.
3. Access to both the network and the local filesystem.

Local files with access to the local filesystem (level 1 or 3) store their shared objects in one location. Local files without access to the local filesystem (level 2) store their shared objects in another location.

You can prevent a SWF file from using this method by setting the allowNetworking parameter of the the object and embed tags in the HTML page that contains the SWF content.

For more information, see the Flash Player Developer Center Topic: Security.

Parameters

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More examples

Returns a reference to a shared object on Flash Media Server that multiple clients can access. If the remote shared object does not already exist, this method creates one.

To create a remote shared object, call getRemote() the call connect() to connect the remote shared object to the server, as in the following:

 var nc:NetConnection = new NetConnection(); nc.connect("rtmp://somedomain.com/applicationName"); var myRemoteSO:SharedObject = SharedObject.getRemote("mo", nc.uri, false); myRemoteSO.connect(nc); 

To confirm that the local and remote copies of the shared object are synchronized, listen for and handle the sync event. All clients that want to share this object must pass the same values for the name and remotePath parameters.

To create a shared object that is available only to the current client, use SharedObject.getLocal().

Parameters

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More examples

Related API Elements

Broadcasts a message to all clients connected to a remote shared object, including the client that sent the message. To process and respond to the message, create a callback function attached to the shared object.

Parameters

Indicates to the server that the value of a property in the shared object has changed. This method marks properties as dirty, which means changed.

Call the SharedObject.setProperty() to create properties for a shared object.

The SharedObject.setProperty() method implements setDirty(). In most cases, such as when the value of a property is a primitive type like String or Number, you can call setProperty() instead of calling setDirty(). However, when the value of a property is an object that contains its own properties, call setDirty() to indicate when a value within the object has changed.

Parameters

Related API Elements

Updates the value of a property in a shared object and indicates to the server that the value of the property has changed. The setProperty() method explicitly marks properties as changed, or dirty.

For more information about remote shared objects see the Flash Media Server documentation.

Note: The SharedObject.setProperty() method implements the setDirty() method. In most cases, such as when the value of a property is a primitive type like String or Number, you would use setProperty() instead of setDirty. However, when the value of a property is an object that contains its own properties, use setDirty() to indicate when a value within the object has changed. In general, it is a good idea to call setProperty() rather than setDirty(), because setProperty() updates a property value only when that value has changed, whereas setDirty() forces synchronization on all subscribed clients.

Parameters

Related API Elements

Dispatched when an exception is thrown asynchronously — that is, from native asynchronous code.

This event has the following properties:

Dispatched when a SharedObject instance is reporting its status or error condition. The netStatus event contains an info property, which is an information object that contains specific information about the event, such as whether a connection attempt succeeded or whether the shared object was successfully written to the local disk.

This event has the following properties:

Related API Elements

Dispatched when a remote shared object has been updated by the server.

This event has the following properties:

Related API Elements