[Swig-user] Having problems with %newobject and %delobject

[Eric W. <ewm...@gm...>]

Sorry if some of you have already seen this, but I'm struggling with
%newobject and %delobject. I can't tell if the problem is if I'm
misusing and misunderstanding them or if there is an actual bug. My
expectation is in garbage collected languages, the %delobject function
should automatically be invoked when all references to an object are
removed and the garbage collector kicks in.


In my reduced test case, I have 2 C functions that load sound handles
(malloc) and a function that deletes them. In my .i file, I declare
them like so:

%newobject ALmixer_LoadAll;
%newobject ALmixer_LoadStream;
%delobject ALmixer_FreeData;
extern ALmixer_Data* ALmixer_LoadAll(const char* file_name);
extern ALmixer_Data* ALmixer_LoadStream(const char* file_name);
extern void ALmixer_FreeData(ALmixer_Data* almixer_data);

I started with the JavaScriptCore generator but never saw anything get
collected. So with the Lua generator, I repeated the same test and
know I can force garbage collection by calling
collectgarbage("collect").

Basically my test script is:
sound = ALmixer.LoadAll("test.wav")
sound = nil
collectgarbage("collect")

I expect my ALmixer.FreeData function to be called when the object is
collected. My FreeData function prints a message to let me know if it
was called. It is not called.



Thanks,
Eric
-- 
Beginning iPhone Games Development
http://playcontrol.net/iphonegamebook/