Decode JSON FlashVars in AS3

Question

I'm struggling with passing a JSON object to a .swf via FlashVars and decoding the JSON FlashVars in AS3 and was hoping you could help me.

Problem: I get an JSONParseError: Unexpected o encountered when I try to decode the FlashVars.

Situation:

A PHP function creates paths to images from a hash and puts them together in this JSON object:

[{"index":"0", "path":"image1", "ext":"jpg"}, {"index":"1", "path":"image2", "ext":"jpg"}, {"index":"2", "path":"image3", "ext":"jpg"}]

This JSON is passed to .swf via Flashvars. In the HTML I have this:

<param name="FlashVars" value='[{"index":"0", "path":"image1", "ext":"jpg"},{"index":"1", "path":"image2", "ext":"jpg"},{"index":"2", "path":"image3", "ext":"jpg"}]'/>

The PHP function and the .swf are in the same folder on the webspace

Then I try to decode the FlashVars in my main.as file with this AS3 Code (as3corelib is imported):

var imagePaths:Object; try { var paramObj:Object = LoaderInfo(this.root.loaderInfo).parameters; trace(paramObj.toString()); if(paramObj){ imagePaths = JSON.decode(paramObj.toString()); } } catch (error:Error) { trace(error.toString()); }

"imagePaths" holds the JSON object so later the paths to the images could be constructed. As far as I understood JSON.decode returns an This worked fine when I loaded the exactly same JSON on localhost from a separate txt file with:

var imagePathLoader:URLLoader = URLLoader(e.target); imagePaths = JSON.decode(imagePathLoader.data);

The error obviously occurs in the try block, so I traced the paramObj variable with trace(paramObj.toString()); and get [object Object]as output. It seems to me that the JSON decode function is trying to decode the string [object Object] rather than the object itself and therefore throws an error at the first "o" of "object"?

I already tried to urlencode() the JSON from PHP before passing as FlashVars, the suggestions found on http://code.google.com/p/as3corelib/issues/detail?id=119 and did JSON.decode(paramObj); without .toString() which throws this error:

1118: Implicit coercion of a value with static type Object to a possibly unrelated type String.

So, how do I pass the JSON correctly to the .swf and decode it in AS3 to an object?

Thanks in advance for any help

Have you tried JSON.encode() instead? Decode tries to parse a JSON formatted string into an object. Encode turns an actionscript Object into a JSON formatted string. — scriptocalypse
– scriptocalypse, Commented Apr 22, 2011 at 13:39

anemgyenge · Accepted Answer · 2011-04-22 16:01:16Z

This page shows that the correct usage of flashvars is:

<PARAM NAME=FlashVars VALUE="varname=value">

In your code you have

<param name="FlashVars" value='[{"index":"0", "path":"image1", "ext":"jpg"},{"index":"1", "path":"image2", "ext":"jpg"},{"index":"2", "path":"image3", "ext":"jpg"}]'/>

So I guess it should be something like

<param name="FlashVars" value='myvariable=[{"index":"0", "path":"image1", "ext":"jpg"},{"index":"1", "path":"image2", "ext":"jpg"},{"index":"2", "path":"image3", "ext":"jpg"}]'/>

then in the flash code you can reach this by

root.loaderInfo.parameters["myvariable"]

or

root.loaderInfo.parameters.myvariable

or if you prefer this way

var paramObj:Object = LoaderInfo(this.root.loaderInfo).parameters;

then

paramObj["myvariable"]

or

paramObj.myvariable.

hreimer · Accepted Answer · 2011-04-23 21:46:47Z

Thanks for the replies..I also found this out yesterday but couldn't answer my own question for 8h (new user..). What I did: In the HTML file that embeds the swf:

<param name="FlashVars" value="var=urlencode([{"index":"0", "path":"image1", "ext":"jpg"}, {"index":"1", "path":"image2", "ext":"jpg"}, {"index":"2", "path":"image3", "ext":"jpg"}])"/>

then in the AS3 code I accessed the FlashVars with:

var imagePaths:Object; var paramObj:Object = LoaderInfo(this.root.loaderInfo).parameters; var myFlashVar:String; var varName:String; for (varName in paramObj) { myFlashVar = String(paramObj[varName]); } imagePaths = JSON.decode(myFlashVar);

then processed the JSON object as usual..thanks for your help!

can't tell if that's the case, however at the time of the question and now even more I don't care about IE support..

Collectives™ on Stack Overflow

Decode JSON FlashVars in AS3

2 Answers 2

Comments

1 Comment

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Related