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:
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// 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0
if (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;
}
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Lua 文件:
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-- config test
width = 200
height = 500
function add(a,b)
return a+b
end
math.randomseed(os.time())
function roll_num()
return math.random(6)
end
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