GC or Scope problem?!! (Passing pointer to Lua)

[Nelson Wong <gogoneruson@...>]

Hi all,

I am having a problem with passing pointer to Lua script.
I want to to be able to create a game stage from the scripts. The
objects that are being created by script will still exist, so the game
code (Native Code) can pick them up and start the game.

I passed pointer as following (in C++)
------------------------------------------------------
....
MyStage * myStage;
Script.run("CreateStage", myStage);
...
System.Starrt(myStage);  



in Lua Script,
-------------------
CreateStage = function(stage)
    stage = MyStage:Create();
    enemy1 = Enemy:Create(Enemy::MALE);
    stage.AddCharacter(enemy1);
    enemy2 = Enemy:Create(Enemy::FEMALE);
    stage.AddCharacter(enemy2);
    building1 = Building:Create();
    stage.AddBuilding(building1);
end 

remark, I have all the binding functions for all those C++ classes and methods.

Problem is, all the objects are GONE, after calling "Script.run(....)
where System.Start(myStage) give me runtime-error. In fact, I found
that all the objects actually successfully created WITHIN the
Script:run(...) calls.

Is that the scope problem, or Lua's GC collects my objects since they
are actually created in the script stack.

Is there a easy way to identify the problem? for example, turn off the
GC, so I can pin-point if the problem is caused GC or not.


Thanks for any comments and helps.

-N