C调用Lua

 1 /*读取lua配置文件样例*/
 2 
 3 char fname[]="config";
 4 float width,height;
 5 //创建lua运行环境
 6 lua_State *L = luaL_newstate();  
 7 luaL_openlibs(L);
 8 
 9 //载入程序块并执行
10 if (luaL_loadfile(L, fname) || lua_pcall(L, 0, 0, 0))
11     error(L, "cannot run config. file: %s", lua_tostring(L, -1));
12 
13 //读取运行结果到虚拟栈中
14 lua_getglobal(L, "width");
15 lua_getglobal(L, "height");
16 
17 //和虚拟栈的交互
18 if (!lua_isnumber(L, -2))
19 　　error(L, "‘width‘ should be a number\n");
20 if (!lua_isnumber(L, -1))
21 　　error(L, "‘height‘ should be a number\n");
22 width  = lua_tointeger(L, -2);
23 height = lua_tointeger(L, -1);