dll按功能luaL_openlib出口，然后lua使用package.loadlib导入库函数，基本就是这么个过程，以下上代码来说明一切。

#include "stdafx.h"

#ifdef __cplusplus

extern "C"{

#endif

#include "lua.h"

#include "lualib.h"

#include "lauxlib.h"

#ifdef __cplusplus

}

#endif

#include <math.h>

#pragma comment(lib, "lua51.lib")

static int math_abs(lua_State *L)

{

	lua_pushnumber(L, abs((int)luaL_checknumber(L, 1)));

	return 1;

}

static int math_cos(lua_State *L)

{

	lua_pushnumber(L, cos((double)luaL_checknumber(L, 1)));

	return 1;

}

static int math_sin(lua_State *L)

{

	lua_pushnumber(L, sin((double)luaL_checknumber(L, 1)));

	return 1;

}

static const luaL_reg mathlib[] = {

	{ "abs", math_abs },

	{ "cos", math_cos },

	{ "sin", math_sin },

	{ NULL, NULL }

};

static int ShowMessage(lua_State * L)

{

	lua_pushnumber(L, 1000);

	printf("show message and push 1000 \n");

	return -1;

}

#ifdef _WIN32

extern "C" __declspec(dllexport) int luaopen_luadlllib(lua_State* L)

{

#else

extern "C"  int luaopen_luadlllib(lua_State* L)

{

#endif // _WIN32

	//MessageBox(NULL, TEXT("Register C++ Functions..."), NULL, MB_OK);

	luaL_openlib(L, "DY_MATH", mathlib,0);

	return 1;

}

--region loadlib.lua

	--Date

	--此文件由[BabeLua]插件自己主动生成

   --(package.loadlib("./../Debug/libforlua", "luaopen_luadlllib"))()

    --(package.loadlib("./../Debug/libforlua.dll", "luaopen_luadlllib"))()

    local libpath="./../Debug/libforlua.dll"

    local loadlibfunc=package.loadlib(libpath,"luaopen_luadlllib")

    loadlibfunc()

	function COS(a)

	print("called COS in lua script")

	return DY_MATH.cos(a)

	end

	function SIN(a)

	print("called SIN in lua script")

	return DY_MATH.sin(a)

	end

	function SHOWMESSAGE()

	showmessage()

	end

	print(COS(60*3.1415926/180))

    print("enter a number:")

    a = io.read("*number") 

	--endregion

babelua插件的设置：

演示样例project的下载地址:http://download.****.net/detail/x356982611/7401781