lua调用C++函数

#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)