Array in AS3

Anfänger

Donnerstag, 5. März 2009, 16:15

I am at the end of my wisdom and would appreciate a quick help with the createarray() command:

Could not find anything in your forum..

- I successfully created an array and filled it in xml
- can read separate entries directly in as3 - krpano.get("plugin[thumbs:panos].thumb[3].url")
- but can't bring the accessible array into an swf plugin

here are the snippets:
xml:

<action name="load_pano_thumbnails">
set(plugin[thumbs:panos].thumb[2].url,1.jpg);
set(plugin[thumbs:panos].thumb[3].url,2.jpg);
set(plugin[thumbs:panos].thumb[4].url,3.jpg);
set(plugin[thumbs:panos].thumb[testy].url,4.jpg);
set(plugin[thumbs:panos].alpha,0);
trace(has loaded);
</action>

And the as3 part:
//note: array is initialized in as3:

plugin_object.createarray("thumb")

function updateEvent(dataevent:DataEvent):void

{
krpano.trace(0, krpano.get("plugin[thumbs:panos].thumb[3].url") ); //this works like a charm
try{
var temp:* = krpano.get("plugin[thumbs:panos].thumb" ); //this doesn't return the array, but an 'object Kinterface_array' that I cannot access the regular array way :-)

krpano.trace(0, temp[3].url ); //hence, this doesn't run
}catch(e:Error){
krpano.trace(0, e );
}
}
//end

Is there any documentation on how to use the object kinterface_array()? or another way to be able to treat the xml generated array as an array in as3?

Thanks for any response in advance.

Zum Seitenanfang

klaus.krpano

Administrator

Beiträge: 13 499

2

Donnerstag, 5. März 2009, 17:33

Hi,

first some notes for array elements:

array elements can be accessed by their name or a numeric index
when the first character of the indexname is a number then this number is interpreted as index (0 based)
otherwise the element is accessed by the given name
try to avoid mixing of numeric and names as index when defining array items in the xml!

here a example - how to get the name of each array item with the krpano interface: (AS3 code / JS similar)

Quellcode

var count:int = int( krpano.get("plugin.count") );
var i:int;

for (i=0; i<count; i++)
{
   var itemname:String = krpano.get("plugin[" + i + "].name");
   // ...
   // all other attributes can be accessed by the same way
}

this is the standard way via the krpano interface, this works identically also in javascript!

but with AS3 - there is also a more advanced and faster access possible

an Array in krpano is of the internal type "Kinterface_array",
this Array can by accessed as "Object" in AS3,

how to use it:

first get the internal array object via the krpano interface:

	Quellcode
1	var krpanoarray:Object = krpano.get("plugin");

this Kinterface_array object has the following attributes and interface functions:

attributes:

count
- the number of elements in this array
- could be changed by setting it, but warning - only reducing the size is possible (e.g. set to 0 to clear the array), increasing the count would have a undefined behavior!

functions:

createItem(name:String):*
- creates a new array item with the given name
- returns the new item object
getItem(name:String):*
- returns the item object or null if not found
- when name is a numeric value - the name is interpreted as index (0 ... count-1)
getItemIndex(index:int):*
- direct index access (faster than getItem)
- returns the item object or null if not found
getArray():Array
- returns a AS3 Array object of all array items
- note - this Array object can be used for reading/modify items, but the Array item shouldn't be changed!
renameItem(oldname,newname):void
- changes the name of a array item
- note - the name is a special attribute of a item, it can't be changed direct!
removeItem(name):*
- removes the item from the array
- and returns the removed item

here a example how to parse a array in AS3 in the fastest way: (AS3 code)

Quellcode

var plugins:Object = krpano.get("plugin");

var pluginsarray:Array = plugins.getArray();

var count:int = pluginsarray.length;
var i:int;

for (i=0; i<count; i++)
{
    var item:Object = pluginsarray[i];
    trace(item.name);
}

I hope I could clarify some of the krpano internals to help using it

best regards,
Klaus

Zum Seitenanfang

pb360

Anfänger

Beiträge: 18

3

Donnerstag, 5. März 2009, 19:19

first 2 array items empty

Hi Klaus,

Thanks for the info. That got me one big step further. I noticed though, that the array has 2 empty(?) entries [0] & [1], which are not created anywhere. I generate the array in AS3:

	Quellcode
1	plugin_object.createarray("thumb");

fill it in xml:

	Quellcode
1 2 3 4	set(plugin[thumbs:panos].thumb[0].url,1.jpg); set(plugin[thumbs:panos].thumb[1].url,2.jpg); set(plugin[thumbs:panos].thumb[2].url,3.jpg); set(plugin[thumbs:panos].thumb[3].url,4.jpg);

and read it out in AS3:

Quellcode

function updateEvent(dataevent:DataEvent):void
{
	// get all current values from krpano
	thumb = plugin_object.thumb.getArray();
	
	var count:int = plugin_object.thumb.count;
	var i:int;
	
	for (i=0; i<count; i++)
	{
		try{
			var item:Object = thumb[i];
			krpano.trace(0, item.url);
		}catch(e:Error){
			krpano.trace(0, e );
		}
	}

}

this returns 6 entries??? as follows in the krpano trace:

DEBUG: TypeError: Error #1009
DEBUG: TypeError: Error #1009
DEBUG: 1.jpg
DEBUG: 2.jpg
DEBUG: 3.jpg
DEBUG: 4.jpg

Any idea where these mysterious entries come from? Any help is greatly appreciated!

Thanks,
P

Zum Seitenanfang

klaus.krpano

Administrator

Beiträge: 13 499

4

Donnerstag, 5. März 2009, 19:39

that's really strange!
do you have a example online or can you post the full xml?

Zum Seitenanfang

pb360

Anfänger

Beiträge: 18

5

Donnerstag, 5. März 2009, 19:53

all sorted

You know what's even stranger!? I didn't change the xml file, neither the as3 fire... and it works. Might have been something in the browser cache or so. Thanks. I'll post more if it re-appears :-)

P