LuaInterface.LuaDLL.luaL_getmetatable C# (CSharp) Method

        public static void luaL_getmetatable(IntPtr luaState, string meta)
        {
            LuaDLL.lua_getfield(luaState, LuaIndexes.LUA_REGISTRYINDEX, meta);
        }
        [DllImport(LUADLL, CallingConvention = CallingConvention.Cdecl)]

        public void PushNewValueObject(IntPtr luaState, object o, int index)
        {
            LuaDLL.luanet_newudata(luaState, index);
            LuaDLL.luaL_getmetatable(luaState, o.GetType().AssemblyQualifiedName);

            if (LuaDLL.lua_isnil(luaState, -1))
            {
                Debuger.LogWarning("Create not wrap ulua type:" + o.GetType().AssemblyQualifiedName);
                LuaDLL.lua_settop(luaState, -2);
                LuaDLL.luaL_newmetatable(luaState, o.GetType().AssemblyQualifiedName);
                LuaDLL.lua_pushstring(luaState, "cache");
                LuaDLL.lua_newtable(luaState);
                LuaDLL.lua_rawset(luaState, -3);
                LuaDLL.lua_pushlightuserdata(luaState, LuaDLL.luanet_gettag());
                LuaDLL.lua_pushnumber(luaState, 1);
                LuaDLL.lua_rawset(luaState, -3);
                LuaDLL.lua_pushstring(luaState, "__index");
                LuaDLL.lua_pushstring(luaState, "luaNet_indexfunction");
                LuaDLL.lua_rawget(luaState, (int)LuaIndexes.LUA_REGISTRYINDEX);
                LuaDLL.lua_rawset(luaState, -3);
                LuaDLL.lua_pushstring(luaState, "__gc");
                LuaDLL.lua_pushstdcallcfunction(luaState, metaFunctions.gcFunction);
                LuaDLL.lua_rawset(luaState, -3);
                LuaDLL.lua_pushstring(luaState, "__tostring");
                LuaDLL.lua_pushstdcallcfunction(luaState, metaFunctions.toStringFunction);
                LuaDLL.lua_rawset(luaState, -3);
                LuaDLL.lua_pushstring(luaState, "__newindex");
                LuaDLL.lua_pushstdcallcfunction(luaState, metaFunctions.newindexFunction);
                LuaDLL.lua_rawset(luaState, -3);
            }

            LuaDLL.lua_setmetatable(luaState, -2);
        }