[Flashcoders] How does registerClass() / registerClassAlias() work internally?

2006-08-21 Thread Marcelo de Moraes Serpa 

It always intrigued me how this method worked internally. First, when I
register this (AS2):

Object.registerClass('mylinkageid_or_myobjectname',myclass);

1)How does flash knows that each time I create a new instance of the
object/movieclip symbol it should attach it to the class specified? Is it
internal to the Flash Player OR is it implemented in pure ActionScript? Does
Flash keep a kind of a dictionary list or hash table to keep all these
values?

2)What also defies me is how does flash automatically instantiates the
correct Value Object class when you use a application server such as AMFPHP
1.2... does AMFPPHP send a class namepsace metadata together with the object
and the flash remoting engine reads that and then applies the correct class
depending on the class that has been registered with registerClass() /
registerClassAlias() (Flex 2)?

Thanks,

Marcelo.
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Re: [Flashcoders] How does registerClass() / registerClassAlias() work internally?

2006-08-21 Thread Martin Wood 



Marcelo de Moraes Serpa wrote:

It always intrigued me how this method worked internally. First, when I
register this (AS2):

Object.registerClass('mylinkageid_or_myobjectname',myclass);

1)How does flash knows that each time I create a new instance of the
object/movieclip symbol it should attach it to the class specified? Is it
internal to the Flash Player OR is it implemented in pure ActionScript? 
Does

Flash keep a kind of a dictionary list or hash table to keep all these
values?


I believe it is internal to the flash player. The same mechanism is used for 
local shared objects. I dont know how its stored or how it works and i've not 
noticed anything relating to it in the remoting source code that they provide.



2)What also defies me is how does flash automatically instantiates the
correct Value Object class when you use a application server such as AMFPHP
1.2... does AMFPPHP send a class namepsace metadata together with the 
object

and the flash remoting engine reads that and then applies the correct class
depending on the class that has been registered with registerClass() /
registerClassAlias() (Flex 2)?


exactly.

if you look at the AMFPHP source (or some AMF specs...i just have the source to 
hand) you'll see that the classname is written into the AMF packet by the 
serializer :


$this-writeUTF($classname); // write the class name

(in AMFSerializer.php)

the player then reads the AMF packet, decodes the class name and instantiates 
that type for you.


thanks.

Martin
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