1. 全局变量的操作

void lua_getglobal(lua_State * L ,const char * name)

此函数从lua中取出一个名为name的全局变量并将其压入栈中。

如当lua文件内容为

width = 200

height = 300

时，以下代码

int _tmain(int argc, _TCHAR* argv[]){    lua_State *L = luaL_newstate();    luaL_openlibs(L);    if(0 != luaL_loadfile(L,"config_width_height.lua"))    {        printf("loadbuff error :%s",lua_tostring(L,-1));        lua_pop(L,-1);    }    if(0 != lua_pcall(L,0,0,0))    {        printf("pcall error :%s",lua_tostring(L,-1));        lua_pop(L,-1);    }    lua_getglobal(L,"width");    printf("width  = %d\n",lua_tointeger(L,-1));    lua_getglobal(L,"height");    printf("height = %d\n",lua_tointeger(L,-1));    lua_settop(L,0);    lua_close(L);    system("pause");    return 0;}

运行结果为

width  = 200

height = 300

请按任意键继续. . .

2.   table的操作

文件内容：

width = 200

height = 300

background =

{

    r = 0,

    g = 0,

    b = 1

}

获取以上 r g b的代码

int red;    int blue;    int green;    lua_getglobal(L,"background");   //push table    if(lua_istable(L,-1))    {        red = getfield(L,"r");        green = getfield(L,"g");        blue = getfield(L,"b");        printf("red:%d,green:%d blue:%d ",red,green,blue);    }

 

注意：getfield不是 lua内置函数。getfield函数如下。

/*假设table 们位于栈顶*/int getfield(lua_State * L,const char * key){    int result ;    lua_pushstring(L,key);      //push index    lua_gettable(L,-2);//获取table   //pop index push table[index]    if(!lua_isnumber(L,-1))        printf("error is the value is not a value\n");    result = (int ) lua_tonumber(L,-1) * MAX_COLOR;    lua_pop(L,1);      return result;}