C语言模块回调Lua函数的两种方法

static int lua_callback = LUA_REFNIL;

static int setnotify(lua_State *L)
{
  lua_callback = luaL_ref(L, LUA_REGISTRYINDEX);
  return 0;
}

static int testnotify(lua_State *L)
{
  lua_rawgeti(L, LUA_REGISTRYINDEX, lua_callback);
  lua_call(L, 0, 0);
}

function callback(  )
    print "Callback"
end

cb.setnotify(callback)
cb.testnotify()

static int testenv(lua_State *L)
{
  lua_getglobal(L, "defcallback");
  lua_call(L, 0, 0);
}

#include stdio.h>
#include stdlib.h>
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"

static int lua_callback = LUA_REFNIL;

static int setnotify(lua_State *L)
{
  lua_callback = luaL_ref(L, LUA_REGISTRYINDEX);
  return 0;
}

static int testnotify(lua_State *L)
{
  lua_rawgeti(L, LUA_REGISTRYINDEX, lua_callback);
  lua_call(L, 0, 0);
}

static int testenv(lua_State *L)
{
  lua_getglobal(L, "defcallback");
  lua_call(L, 0, 0);
}

static const luaL_Reg cblib[] = {
  {"setnotify", setnotify},
  {"testnotify", testnotify},
  {"testenv", testenv},
  {NULL, NULL}
};

int luaopen_cb(lua_State *L)
{
  luaL_register(L, "cb", cblib);
  return 1;
}

require("cb")

function callback(  )
  print "Callback"
end

function defcallback()
  print "Predef callback"
end

cb.setnotify(callback)
cb.testnotify()
print "Done"
cb.testenv()