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; } |
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 |