lua调用c++

<1>c++部分

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

lua_State* L;
static int average(lua_State* L)
{
	int n = lua_gettop(L);
	double sum = 0;
	for(int i = 1; i <= n; i++)
	{
		if(!lua_isnumber(L,i))
		{
			lua_pushstring(L,"Incorrect argument to 'average'");
			lua_error(L);
		}
		sum += lua_tonumber(L,i);
	}

	lua_pushnumber(L,sum/n);
	lua_pushnumber(L,sum);
	return 2;
}

void luaCallCPlusPlus()
{
	L = lua_open();
	luaL_openlibs(L);
	lua_register(L,"average",average);
	luaL_dofile(L,"e15.lua");
	lua_getglobal(L,"avg");
	lua_tointeger(L,-1);

	CCLog("===>%d",lua_tointeger(L,-1));  //30

	lua_pop(L,1);
	lua_getglobal(L,"sum");
	lua_tointeger(L,-1);
	lua_close(L);
}

//e15.lua
avg,sum = average(10,20,30,40,50)
print("The average is:"..avg)
print("The sum is:"..sum)

通过luaCallCPlusPlus既可以看到日志结果