lua中调用c++函数

// average.cpp : Defines the entry point for the console application.

//



#include "stdafx.h"

#include <stdio.h>



extern "C" {



 #include "lua.h"



 #include "lualib.h"



 #include "lauxlib.h"



}



/* 指向Lua解释器的指针 */



lua_State* L;



static int average(lua_State *L)



{

  /* 得到参数个数 */



 int n = lua_gettop(L);



 double sum = 0;



 int i;





 /* 循环求参数之和 */



 for (i = 1; i <= n; i++)



 {



  /* 求和 */



  sum += lua_tonumber(L, i);



 }



 /* 压入平均值 */



 lua_pushnumber(L, sum / n);



 /* 压入和 */



 lua_pushnumber(L, sum);



  /* 返回返回值的个数 */



 return 2;



}





int main ( int argc, char *argv[] )



{



 /* 初始化Lua */



 L = lua_open();





 /* 载入Lua基本库 */



 luaL_openlibs(L);





 /* 注册函数 */



 lua_register(L, "average", average);





 /* 运行脚本 */



 luaL_dofile(L, "avg.lua");





 /* 清除Lua */



 lua_close(L);





 /* 暂停 */



 printf( "Press enter to exit…" );



 getchar();





 return 0;



}

avg.lua:

-- call a C++ function

avg, sum = average(10, 20, 30, 40, 50)

print("The average is ", avg)

print("The sum is ", sum)