Bind c++ static functions from another class to Lua

Question

Hy!

My problem is simple: I have a function in the extendedgamefunctions class:

In the header:

#include "Gameitems.h" 
extern "C" {
    #include "lua.h"
    #include "lualib.h"
    #include "lauxlib.h"
};

extern std::vector<std::vector<Gameitems>> items;

     class A
        {
             A(); 
             ~A();

        public:
              static void messagewindow(lua_State*);
        };

and the code is:

  Functions extfunctions;
    A::A()
    {}
    A::~A()
    {}

    void A::messagewindow(lua_State *L)
    {
       string message =lua_tostring(L,0);
       extfunctions.Messagewindow(message);
    }

and I want to bind in an another function called Gamefunctions :

#include "Externedgamefunctions.h"

A egfunctions;
lua_State* L;
        void Gamefunctions::luainit()
        {
            L = luaL_newstate();

            /* load Lua base libraries */
            luaL_openlibs(L);
            lua_pushcfunction(L,&A::messagewindow);
            lua_setglobal(L, "messagewindow");
        }

Rather the funtion from another class is static, I get this error:

Error   5   error C2664: 'lua_pushcclosure' : cannot convert parameter 2 from 'void (__cdecl *)(lua_State *)' to 'lua_CFunction'    C:\Users\Bady\Desktop\MY Game\basicconfig\BlueButterfly\BlueButterfly\Gamefunctions.cpp 170

I dont want to make a plus funtion into the gamefunctions to get the messagewindow (unless I have no other coises) because I directly write the extendedgamefunctions to not make an endless stringmonster.

Edit: Almost forgot: Lua 5.2 and c++11

mtsvetkov · Accepted Answer · 2015-11-06 14:19:49Z

1

lua_CFunction is defined as typedef int (*lua_CFunction) (lua_State *L);, so you need to change void A::messagewindow(lua_State *L) to int A::messagewindow(lua_State *L).

answered Nov 6, 2015 at 14:19

mtsvetkov

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3 Comments

Bady Over a year ago

Thank you. You are my hero :)

mtsvetkov Over a year ago

It was all in the error message :P Should also be noted that the int you return is the number of values you've pushed to the stack as return values for the function on the lua side.

Bady Over a year ago

I figured that out. And yes, that is me. I write an ernomous size of codes, and searching for hours a mispelled "==". But no bigger errors.

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