Calling back from C++ library

Question

I am trying to call back to ActionScript from my C++ code. So far I could get only generic functions, e.g.,
AS3_Val traceObj = AS3_NSGetS(NULL, "trace");
I could not get or call any class or function I defined. What am I missing?
C++ code:
AS3_Val tNS = AS3_String("alchemy.test"); // I tried others, e.g., "", "cmodule.libtest"
AS3_Val tClass = AS3_NSGetS(tNS, "callback");       // tClass is 0, so AS3_Call() does not work...
AS3_Val t2Class = AS3_NSGetS(NULL, "myCallback");   // t2Class is 0
AS3_Val tMsg = AS3_String("Hello");
AS3_CallTS("myCallback", NULL, "StrType", tMsg);    // does not work
AS:
package alchemy.test {
    public class libtest {
        static public function callback(msg:String):int {
            return _lib.callback(msg);
MXML:
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" applicationComplete="init()">
    <mx:Script>
        <![CDATA[                       
            public function myCallback(msg:String):void
                trace(msg);
        ]]>
    </mx:Script>
</mx:WindowedApplication>
Thank you,
Csaba

Answer 1

I found a way to call functions I created but it's not the most elegant solution.  In short, I found that you need to call a function pointer to the function you intend to call.  I'm going from memory so I apologize if it does not compile.  Still, it should give you the basic idea.
ActionScript
public class A
     public var callbackPtr:Function = callback();
public function A()
     var loader:CLibInit = new CLibInit;
     var alchemyClass  = loader.init();
     alchemyClass.setA(this);
     alchemyClass.callAS()
public function callback():Function
function callbackTrace(bytes:ByteArray):void
trace("callback...");
return callbackTrace;
C
AS3_Val classA;
AS3_Val setA(void *self, AS3_Val args)
classA = AS3_Undefined();
AS3_ArrayValue(args, "AS3ValType", & classA);
return AS3_Null();
AS3_Val callAS(void *self, AS3_Val args)
     AS3_CallS("callbackPtr", classA, AS3_Null());
     return AS3_Null();