dll通过函数luaL_openlib导出，然后lua使用package.loadlib导入库函数，基本就是这么个过程，下面上代码来说明一切。

#include "stdafx.h"

#ifdef __cplusplus
extern "C"{
#endif

#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"

#ifdef __cplusplus
}
#endif

#include

#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：

示例工程的下载地址:

具体下载目录在 /2014年资料/9月/19日/Lua入门之三：Lua调用C&C++库（动态链接方式）

--------------------------------------分割线 --------------------------------------