lua例子getglobal()
#include <stdio.h> #define MAX_COLOR 255 extern "C" { #include "lua-5.2.2/src/lauxlib.h" #include "lua-5.2.2/src/lualib.h" #include "lua-5.2.2/src/lstate.h" } int getfield(const char* key, lua_State* L) { int result = 0; lua_pushstring(L, key); lua_gettable(L, -2);//以栈顶的值作为key来访问-2位置上的table。并将其值放入栈顶 if (!lua_isnumber(L, -1))//将栈顶元素转换成double类型 { } result = (int)lua_tonumber(L, -1) * MAX_COLOR;//lua_tonumber只是转换栈顶元素是不出栈的 lua_pop(L, 1);//从栈中弹出1个元素 return result; } int main(int argc, char *argv[]) { const char* buf = "background = {r=30, g=10, b=0} "; lua_State* L = luaL_newstate(); luaL_dostring(L, buf); lua_getglobal(L, "background");//获取全局变量的background的值,并将其放入栈顶 if (!lua_istable(L, -1))//判断是否是table { } int red = getfield("r", L); int green = getfield("g", L); int black = getfield("b", L); getchar(); return 0; }