C++中調(diào)用Lua配置文件和響應(yīng)函數(shù)示例

// Lua1.cpp : 定義控制臺(tái)應(yīng)用程序的入口點(diǎn)。 
// 
 
#include "stdafx.h" 
#includestdio.h> 
 
extern "C" { //如不用extern會(huì)出現(xiàn)連接錯(cuò)誤，編譯成了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");  //獲得Lua中變量的值，將其放入棧中 
  lua_getglobal(L,"height"); 
 
  if(!lua_isnumber(L,-2))   //棧頂為-1，然后依次減少 
    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);  //將棧頂元素轉(zhuǎn)化為數(shù)字 
  *height = (int)lua_tonumber(L,-1); 
} 
 
int add(lua_State *L,int a, int b){  
  int sum=0; 
  lua_getglobal(L,"add");  //函數(shù)也是變量，所以一個(gè)取法 
  lua_pushnumber(L,a);   //將變量傳入 
  lua_pushnumber(L,b);   
    //第二個(gè)參數(shù)為調(diào)用函數(shù)的參數(shù)的個(gè)數(shù)，第三個(gè)為返回值的個(gè)數(shù)，第四個(gè)參數(shù)是錯(cuò)誤處理函數(shù)，正常運(yùn)行返回0 
  if(lua_pcall(L,2,1,0) != 0){   
    luaL_error(L,"the lua load error! %s",lua_tostring(L,-1)); 
  } 
     //函數(shù)的返回值已經(jīng)傳入棧中 
  if(!lua_isnumber(L,-1)){  
    luaL_error(L,"the func run error! %s",lua_tostring(L,-1)); 
  } 
 
  sum = (int)lua_tonumber(L,-1); //取棧頂元素將其轉(zhuǎn)為數(shù)字，默認(rèn)為double型 
   lua_pop(L,1)    //將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); //新版本庫(kù)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; 
} 

-- 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