The flash.system package contains one package-level function,
fscommand()
, which facilitates communication between a SWF file and its container.Function | Defined By | ||
---|---|---|---|
Lets the SWF file communicate with either Flash Player or the program hosting Flash Player,
such as a web browser. | flash.system |
fscommand | () | function |
public function fscommand(command:String, args:String = ""):void
Language Version: | ActionScript 3.0 |
Runtime Versions: | Flash Player 9, AIR 1.0 |
Lets the SWF file communicate with either Flash Player or the program hosting Flash Player,
such as a web browser. You can also use the fscommand()
function to pass messages to
Director or to Visual Basic, Visual C++, and other programs that can host ActiveX controls.
The fscommand()
function lets a SWF file communicate with a script in a web page.
However, script access is controlled by the web page's allowScriptAccess
setting.
(You set this attribute in the HTML code that embeds the SWF file—for
example, in the PARAM
tag for Internet Explorer or the EMBED
tag for Netscape.)
- When
allowScriptAccess
is set to"sameDomain"
(the default), scripting is allowed only from SWF files that are in the same domain as the web page. - When
allowScriptAccess
is set to"always"
, the SWF file can communicate with the HTML page in which it is embedded even when the SWF file is from a different domain than the HTML page. - When
allowScriptAccess
is set to"never"
, the SWF file cannot communicate with any HTML page. Note that using this value is deprecated and not recommended, and shouldn't be necessary if you don't serve untrusted SWF files from your own domain. If you do need to serve untrusted SWF files, Adobe recommends that you create a distinct subdomain and place all untrusted content there.
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.
The fscommand()
function is not allowed if the calling SWF file is in
the local-with-file-system or local-with-network sandbox and the containing HTML page is in
an untrusted sandbox.
For more security-related information, see the following:
- The security chapter in the Programming ActionScript 3.0 book and the latest comments on LiveDocs
- The security chapter in the Programming ActionScript 3.0 book and the latest comments on LiveDocs
- The Flash Player Developer Center Topic: Security
Usage 1: To use fscommand()
to send a message to Flash Player, you must use predefined commands and parameters. The
following table shows the values that you can specify for the fscommand()
function's command
and
args
parameters. These values control SWF files that are playing in Flash Player, including projectors. (A
projector is a SWF file saved in a format that can run as a stand-alone application—that is, without Flash Player.)
Command | Parameter (args) | Purpose |
---|---|---|
quit | None | Closes the projector. |
fullscreen | true or false | Specifying true sets Flash Player to full-screen mode. Specifying
false returns the player to normal menu view. |
allowscale | true or false | Specifying false sets the player so that the SWF file is always drawn
at its original size and never scaled. Specifying true forces the SWF file to scale to 100% of the
player. |
showmenu | true or false | Specifying true enables the full set of context menu items. Specifying
false hides all of the context menu items except About Flash Player and Settings. |
exec | Path to application | Executes an application from within the projector. |
trapallkeys | true or false | Specifying true sends all key events, including accelerator keys, to
the onClipEvent(keyDown/keyUp) handler in Flash Player. |
Not all of the commands listed in the table are available in all applications:
- None of the commands are available in web players.
- All of the commands are available in stand-alone applications, such as projectors.
- Only
allowscale
andexec
are available in test-movie players.
The exec
command can contain only the characters A-Z, a-z, 0-9, period (.), and underscore (_). The exec
command runs in the subdirectory fscommand only. In other words, if you use the exec
command to call an application, the
application must reside in a subdirectory named fscommand. The exec
command works only from within a Flash projector
file.
Usage 2: To use fscommand()
to send a message to a scripting language such as JavaScript in a web browser, you can
pass any two parameters in the command
and args
parameters. These parameters can be strings or
expressions, and they are used in a JavaScript function that handles, or catches, the fscommand()
function.
In a web browser, fscommand()
calls the JavaScript function moviename_DoFScommand
, which resides in the
web page that contains the SWF file. For moviename
, supply the name of the Flash object that you used for the
NAME
attribute of the EMBED
tag or the ID property of the OBJECT
tag. If you assign the SWF file
the name "myMovie", the JavaScript function myMovie_DoFScommand
is called.
In the web page that contains the SWF file, set the allowScriptAccess
attribute to allow or deny the SWF file's
ability to access the web page, as described above. (You set this attribute in the HTML code that embeds the SWF file—for example, in the
PARAM
tag for Internet Explorer or the EMBED
tag for Netscape.)
In Flash Player 10 and later running in a browser, using this method programmatically to open a pop-up window may not be successful. Various browsers (and browser configurations) may block pop-up windows at any time; it is not possible to guarantee any pop-up window will appear. However, for the best chance of success, use this method to open a pop-up window only in code that executes as a direct result of a user action (for example, in an event handler for a mouse click or key-press event.)
Usage 3: The fscommand()
function can send messages to Director (Macromedia Director from Adobe).
These messages are interpreted by Lingo (the Director scripting language) as strings, events, or executable Lingo
code. If a message is a string or an event, you must write the Lingo code to receive the message from the
fscommand()
function and carry out an action in Director. For more information, see the Director Support
Center at www.adobe.com/support/director/.
Usage 4: In VisualBasic, Visual C++, and other programs that can host ActiveX controls, fscommand()
sends a VB event
with two strings that can be handled in the environment's programming language. For more information, use the keywords "Flash method"
to search the Flash Support Center at www.adobe.com/support/flash/.
Note: The ExternalInterface class provides better functionality
for communication between JavaScript and ActionScript (Usage 2) and between ActionScript and VisualBasic, Visual C++, or other
programs that can host ActiveX controls (Usage 4). You should continue to use fscommand()
for sending messages to Flash
Player (Usage 1) and Director (Usage 3).
Parameters
command:String — A string passed to the host application for any use, or a command passed to Flash Player.
| |
args:String (default = " ") — A string passed to the host application for any use, or a value passed to Flash Player.
|
Throws
Error — If the function is not called in response to a user action, such as a mouse
event or keypress event.
|
Example ( How to use this example )
fscommand()
can be used to direct
Flash Player to go into full screen mode and not allow scaling. An orange box is then
added to the stage using draw()
. In draw()
, a click
event listener is added named clickHandler()
, which responds to click
events by directing Flash Player to exit using another call to fscommand().
Note: this example should be executed in the standalone Flash Player and not within a web browser.
package { import flash.display.Sprite; import flash.text.TextField; import flash.system.fscommand; import flash.events.MouseEvent; public class FSCommandExample extends Sprite { private var bgColor:uint = 0xFFCC00; private var size:uint = 100; public function FSCommandExample() { fscommand("fullscreen", "true"); fscommand("allowscale", "false"); draw(); } private function clickHandler(event:MouseEvent):void { fscommand("quit"); trace("clickHandler"); } private function draw():void { var child:Sprite = new Sprite(); child.graphics.beginFill(bgColor); child.graphics.drawRect(0, 0, size, size); child.graphics.endFill(); child.buttonMode = true; addEventListener(MouseEvent.CLICK, clickHandler); var label:TextField = new TextField(); label.text = "quit"; label.selectable = false; label.mouseEnabled = false; child.addChild(label); addChild(child); } } }
Fri Mar 19 2010, 02:59 AM -07:00