add `movieclip` from external swf's library - actionscript-3

Question

I loaded External swf file to stage :
var mcLoader = new Loader();
this.addChild(mcLoader);
mcLoader.load(new URLRequest("E:\\MySWF.swf"));
var mcLoader = new Loader();
this.addChild(mcLoader);
now I want to add a movieclip from external swf's library with "Part3" as linkage name, I did like below :
var cls:Class = mcLoader.contentLoaderInfo.applicationDomain.getDefinition("Part3") as Class;
var MCCurrentPart = new cls;
but it didn't work, After that I tried like this :
var MCCurrentPart = new mcLoader.content.Part2;
but now it gives error : Instantiation attempted on a non-constructor.

Answer 1

Your use of getDefinition() is fine, just you have to wait until the Event.COMPLETE event in the contentLoaderInfo of the Loader is fired.
So you can do like this :
var loader:Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, on_content_load);
loader.load(new URLRequest('swf.swf'));
function on_content_load(e:Event): void
{
var MyClass:Class = loader.contentLoaderInfo.applicationDomain.getDefinition('MyClass') as Class;
var obj = new MyClass;
addChild(obj);
}
You can take a look in some examples from Adobe here.
Hope that can help.