lua c/c++ 交互基础_可交互的c++基础代码-优快云博客

本文链接：https://blog.youkuaiyun.com/aalbertini/article/details/11004791

本文详细介绍了如何在C/C++程序中通过调用Lua脚本实现加法运算，并演示了如何在Lua中设置和获取全局变量，通过实例代码展示了两者间的无缝集成。

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来源于http://wenku.baidu.com/view/53e0b503763231126edb113c.html

按照示例代码测试了一下可行。

function.lua如下：

function add(a, b)
	local sum = a + b
	return sum
end

z = 12

b = 15

avg,sum = average(10,20,30,40,50)
print("average is ", avg, " . sum is ", sum)

c/c++程序如下：

#include <stdio.h>

extern "C" //如果文件后缀为.c， 则去掉extern "C"
{ 
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}


/* Lua解释器指针 */
lua_State* L;


//call func in lua script....
int luaadd(int x, int y)
{
	int sum;
	lua_getglobal(L, "add");
	lua_pushnumber(L, x);
	lua_pushnumber(L, y);
	lua_call(L, 2, 1); //2个参数， 1个返回值
	sum = (int)lua_tonumber(L, -1);
	lua_pop(L, 1);

	return sum;
}

//get && set global var in lua script
int luagetglobalv(char *z)
{
	int v;
	lua_getglobal(L, z);
	v = (int)lua_tonumber(L, 1);
	lua_pop(L, 1);

	return v;
}

int luasetglobalv(char *z, int newv)
{
	lua_pushnumber(L, newv);
	lua_setglobal(L, z);

	return 0;
}


//call c/c++ func from lua script
static int average(lua_State *L)
{
	int n = lua_gettop(L);
	double sum = 0;
	int i;
	for(i = 1; i <= n; i++)
	{
		if(!lua_isnumber(L, i))
		{
			lua_pushstring(L, "incorrect arg for average");
			lua_error(L);
			return 1; ////////!!!!!!!!!!这里弹栈不正确。。。 暂时还不清楚到底该怎么弹。。
		}
		sum += lua_tonumber(L, i);
	}

	lua_pushnumber(L, sum/n);

	lua_pushnumber(L, sum);

	return 2;					//return num of results
}

int main ( int argc, char *argv[] )
{
	/* 初始化Lua */
	L = lua_open();

	/* 载入Lua基本库 */
	luaL_openlibs(L);

	/* 运行脚本 */
	lua_register(L, "average", average);
	luaL_dofile(L, "C:\\Users\\xx\\Documents\\lua\\function.lua");


	int sum = luaadd(10, 15);
	printf("add result is :%u, z:%u, b:%u\n", sum, luagetglobalv("z"), luagetglobalv("b"));

	luasetglobalv("z", 102);
	printf("cur value of z:%u\n", luagetglobalv("z"));

	/* 清除Lua */
	lua_close(L);

	/* 暂停 */
	printf( "Press enter to exit…" );

	getchar();
	return 0;
}