extern "C"{#include <lua.h>#include <lauxlib.h>#include <lualib.h>}#include <stdarg.h>#include <stdio.h>#include <stdlib.h>#pragma comment(lib,"lua.lib") void error(lua_State* L, const char* fmt, ...){    va_list argp;    va_start(argp, fmt);    vfprintf(stderr, fmt, argp);    va_end(argp);    lua_close(L);    exit(EXIT_FAILURE);}void load(char* filename, int* width, int* height){    lua_State* L = luaL_newstate();    luaopen_base(L);    luaopen_io(L);    luaopen_string(L);    luaopen_math(L);    if (luaL_loadfile(L, filename) || lua_pcall(L, 0, 0, 0))        error(L, "cannot run configuration file:%s", lua_tostring(L, -1));    lua_getglobal(L, "width");//每次调用将相应变量压入栈顶    lua_getglobal(L, "height");    if (!lua_isnumber(L, -2))//lua_isnumber函数判断每个值是否为数字        error(L, "width should be a number");    if (!lua_isnumber(L, -1))        error(L, "height should be a number");    *width = (int)lua_tonumber(L, -2);//lua_tonumber函数将得到的数值转换成double类型并用(int)强制转换成整型    *height = (int)lua_tonumber(L, -1);    lua_close(L);}int main(){    int width = 0;    int height = 0;    load("pp.lua", &width, &height);    return 0;}