AS3 Pass FlashVars to loaded swf

问题:

I have a A.swf which loads B.swf onto a movieclip and needs to pass it some FlashVars. When loading B.swf with html, I can pass FlashVars fine. When passing from A.swf, it gets a

Error #2044: Unhandled ioError:. text=Error #2032: Stream Error. URL: file:

The code in A.swf is

var request:URLRequest = new URLRequest ("B.swf");

var variables : URLVariables = new URLVariables();
variables.xml = "test.xml";

// This line causes the error 2044, else B.swf loads fine with FlashVars  
request.data = variables;

loader.load (request); 

In B.swf, it is checking the Flashvars like so. It works fine from html side

this.loaderInfo.parameters.xml

回答1:

Although the querystring method should work fine locally, if you're using Flash Player 10.2, there's a new API for this.

var context:LoaderContext = new LoaderContext();
context.parameters = {'xml': 'test.xml'};
loader.load(request, context);

The documentation is here: http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/system/LoaderContext.html#parameters

回答2:

It's not necessary that "A" pass FlashVars to "B". Just have B access the FlashVars itself. The following will work whether B is inside of A, or top-level itself:

Add an ADDED_TO_STAGE event listener in B's constructor. e.g.:

function B(){
    this.addEventListener(Event.AddedToStage, onAddedToStageHandler);
}

When you have access to the stage you can now access the FlashVars in A this way:

To properly see a variable called myVar flashVar in B.swf, you do (inside B):

private function onAddedToStageHandler(){
var flashVars : Object = LoaderInfo(this.stage.loaderInfo).parameters;
// now you have access to your flashVars!
trace(flashVars.myVar);
}

stage.loaderInfo is what you need to look at.

回答3:

you can add the flash vars into the URI when you are loading it

URLRequest(String("B.swf" + "?myvar=45"));

the problem is that when you loaded the string in the uri, it is put inside an Object loaderInfo.parameters so if you want to pass those parameters, you need to create a string to pass these into.

here's a script from http://ragona.com/blog/pass-flashvars-loaded-swf/ that shows how to convert that into a string array again

//:: Store loader info
var lInfo:Object = this.root.loaderInfo.parameters;
//:: Flashvars
var fVars:String = "?whee=nada"; //:: Getting the syntax change (? --> &) out of the way with a dummy var

//:: Set path + data
for (var flashVar in lInfo)
{
    fVars += "&" + flashVar + "=" + lInfo[flashVar];
}

var myRequest:URLRequest = new URLRequest(String("/myPath.swf" + fVars));

回答4:

How do I sandbox the permissions? I tried adding the folder via the settings, but that didn't work too.

http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager04.html#117502

I made a simple as new project. This is the complete code.

var mc:MovieClip = new MovieClip ();

var loader:Loader = new Loader ();
loader.contentLoaderInfo.addEventListener (Event.COMPLETE, OnComplete);

var request:URLRequest = new URLRequest ("B.swf"); 

var variables : URLVariables = new URLVariables(); 
variables.xml = "test2.xml"; 

// This line causes the error 2044, if i comment out, it runs fine without FlashVars   
request.data = variables; 

loader.load (request);  


function OnComplete (e:Event)
{
    trace ("On Complete");
    mc = e.currentTarget.content as MovieClip;
    addChild (mc);
}