Re: passing pointers using LuaBridge

[Moose <moose@...>]

Hi Kevin

Am 07.04.2014 11:28 schrieb Kevin Martin:
> What is the output of print(type(getmetatable(mc)))

The output is a simple:

nil

> I'm guessing LuaBridge isn't correctly detecting the type of p, and
> thus isn't setting the proper metatable. The fact that you've
> experienced the same problem with another binding leads me to believe
> it may be a compiler issue?
>
> Do you have access to a different compiler to try the code on?

I too am afraid this might be the case. I just ruled out LuaJit as a 
candidate. It happens with Vanilla Lua 5.1 as well.
Unfortunately, this is a very large infrastructure here so swapping the 
compiler is not an option. Either it works with MSVC9 or my Lua 
evaluation has come to a harsh conclusion ;-)

Can I verify somehow if LuaBridge does the job?
Migt it be a DLL linkage error? MyClass does have a DLL interface with 
__declspec() declarators. Could this be an issue?


On a side note...
I still have hopes I might get the C API to work.

I did use this here:

int init_myclass(lua_State *L) {

	p = new MyClass();

	/* store the pointer to MyClass in global registry */
	lua_pushlightuserdata(L, (void *)&KeyToMyClass);  /* push address */
	lua_pushlightuserdata(L, ret);                   /* push value   */

	/* registry[&KeyToMyClass] = ret */
	lua_settable(L, LUA_REGISTRYINDEX);

	return 0;
}

and then have

int foo(lua_State *L) {

	/* retrieve the pointer to MyClass from registry */
	lua_pushlightuserdata(L, (void *)&KeyToMyClass);  /* push address */
	lua_gettable(L, LUA_REGISTRYINDEX);                /* retrieve value 
*/
	MyClass * mc = (MyClass *)lua_topointer(L, -1);  /* convert to 
pointer*/
	mc->foo();

	return 0;
}

which works in Lua and allows me to call foo() but only after I have 
created using init_myclass().
I would still have to figure out how to pass the living object in there 
and continue to fail.





Cheers,
Moose