在C中调用Lua作配置文件和响应函数

  

Lua是脚本语言，最大的优势就是轻巧灵便，不用编译。当C的框架写好，只要更改lua的相应处理即可以更改功能，并且不用重新编译。以下是在C中调用Lua资源方法的示例程序：

 

C++端：

 

// Lua1.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include<stdio.h>extern "C" {  //如不用extern会出现连接错误，编译成了C++文件#include <lua.h>#include <lualib.h>#include <lauxlib.h>}void load (lua_State *L,int *width,int *height){lua_getglobal(L,"width");   //获得Lua中变量的值，将其放入栈中lua_getglobal(L,"height");if(!lua_isnumber(L,-2))     //栈顶为-1，然后依次减少luaL_error(L,"`width' should be a number\n");if(!lua_isnumber(L,-1))luaL_error(L,"`height' should be a number\n");*width = (int)lua_tonumber(L,-2);    //将栈顶元素转化为数字*height = (int)lua_tonumber(L,-1);}int add(lua_State *L,int a, int b){int sum=0;lua_getglobal(L,"add");   //函数也是变量，所以一个取法lua_pushnumber(L,a);      //将变量传入lua_pushnumber(L,b);           //第二个参数为调用函数的参数的个数，第三个为返回值的个数，第四个参数是错误处理函数，正常运行返回0if(lua_pcall(L,2,1,0) != 0){    luaL_error(L,"the lua load error! %s",lua_tostring(L,-1));}         //函数的返回值已经传入栈中if(!lua_isnumber(L,-1)){ luaL_error(L,"the func run error! %s",lua_tostring(L,-1));}sum = (int)lua_tonumber(L,-1);  //取栈顶元素将其转为数字，默认为double型      lua_pop(L,1)       //将return元素移除return sum;}int get_num(lua_State *L){lua_getglobal(L,"roll_num");if(lua_pcall(L,0,1,0) != 0){luaL_error(L,"the lua load error! %s",lua_tostring(L,-1));}if(!lua_isnumber(L,-1)){luaL_error(L,"the func run error! %s",lua_tostring(L,-1));}     int n = (int)lua_tonumber(L,-1);lua_pop(L,1);return n;}int _tmain(int argc, _TCHAR* argv[]){lua_State *L = lua_open();luaL_openlibs(L);  //新版本库添加的方法if(luaL_loadfile(L,"cof.lua") || lua_pcall(L,0,0,0)){luaL_error(L,"loadfile error! %s \n",lua_tostring(L,-1));}int w=1,h=2;int sum;load(L,&w,&h);printf("width is %d ,height is %d\n",w,h);sum=add(L,w,h);printf("the sum is: %d \n",sum);bool flag = true;char c;while(flag){printf("Do you want to roll the number? \n");scanf("%c",&c);if(c == 'y' || c=='Y'){printf("rolling the number....\n the num is %d \n",get_num(L));}else flag=false;getchar();}getchar();return 0;}

Lua 文件：

 

-- config testwidth = 200height = 500function add(a,b)return a+bendmath.randomseed(os.time())function roll_num()return math.random(6)end

 

本篇博客出自  阿修罗道，转载请注明出处：http://blog.csdn.net/fansongy/article/details/6989160