Re: c side package creation

[Philipp Kraus <philipp.kraus@...>]

Thanks for this great explanation, this helps well.

Phil


Am 07.12.2012 um 13:37 schrieb Jerome Vuarand:

> 2012/12/7 Philipp Kraus <philipp.kraus@flashpixx.de>:
>> I'm using lua_register to register some C function. I can call them in my Lua script. I would like to build packages, something like: mypackage.mysubpackage.myfunction
>> The functions (functionpointers) read from a DLL, so I know the name of the package, subpackage and the pointer of the function. How can I build the package structure?
>> Can I add the packagename to the lua_register eg lua_register(L, "package.subpackage.myfunction", funcptr) ?
> 
> You cannot use lua_register to create such packages. What you need to
> do is create a table on the stack, add your functions to that table,
> and set the table in the globals. For example:
> 
> lua_newtable(L);
>    lua_pushcfunction(L, myfunction_pointer);
>    lua_setfield(L, -2, "myfunction");
>    lua_pushcfunction(L, myfunction2_pointer);
>    lua_setfield(L, -2, "myfunction2");
> lua_setglobal(L, "mypackage");
> 
> If you want sub-packages, you can create sub-tables :
> 
> lua_newtable(L);
>    lua_newtable(L);
>        lua_pushcfunction(L, myfunction_pointer);
>        lua_setfield(L, -2, "myfunction");
>        lua_pushcfunction(L, myfunction2_pointer);
>        lua_setfield(L, -2, "myfunction2");
>    lua_setfield(L, -2, "mysubpackage");
>    lua_newtable(L);
>        lua_pushcfunction(L, myfunction3_pointer);
>        lua_setfield(L, -2, "myfunction3");
>        lua_pushcfunction(L, myfunction4_pointer);
>        lua_setfield(L, -2, "myfunction4");
>    lua_setfield(L, -2, "mysubpackage2");
> lua_setglobal(L, "mypackage");
> 
> You can also use helper functions to help you do that, depending on
> the Lua version you use that would be luaL_register or luaL_setfuncs.
>