Lua教程（三）：C语言、C++中调用Lua的Table示例

void lua_pushnil      (lua_State *L);
void lua_pushboolean  (lua_State *L, int bool);
void lua_pushnumber   (lua_State *L, lua_Number n);
void lua_pushinteger  (lua_State *L, lua_Integer n);
void lua_pushunsigned (lua_State *L, lua_Unsigned n);
void lua_pushlstring  (lua_State *L, const char *s, size_t len);
void lua_pushstring   (lua_State *L, const char *s);

int lua_is* (lua_State * L, int index);

xxx lua_toXXX(lua_State * L, int index);

//取得栈中元素个数
 int  lua_gettop    (lua_State *L);
//设置栈的大小为一个指定的值，而lua_settop(L,0)会把当前栈清空
//如果指定的index大于之前栈的大小，那么空余的空间会被nil填充
//如果index小于之前的栈中元素个数，则多余的元素会被丢弃
 void lua_settop    (lua_State *L, int index);
//把栈中index所在位置的元素压入栈
 void lua_pushvalue (lua_State *L, int index);
//移除栈中index所在位置的元素
void lua_remove(lua_State *L, int index);
//在栈的顶部的元素移动至index处
void lua_insert(lua_State *L, int index);
//从栈顶弹出一个值，并把它设置到给定的index处
void lua_replace(lua_State *L, int index);
//把fromidx处的元素copy一份插入到toidx，这操作不会修改fromidx处的元素
void lua_copy(lua_State *L, int fromidx, int toidx);

static void stackDump(lua_State* L){
    cout<<"\nbegin dump lua stack"<<endl;
    int i = 0;
    int top = lua_gettop(L);
    for (i = 1; i <= top; ++i) {
        int t = lua_type(L, i);
        switch (t) {
            case LUA_TSTRING:
            {
                printf("'%s' ", lua_tostring(L, i));
            }
                break;
            case LUA_TBOOLEAN:
            {
                printf(lua_toboolean(L, i) "true " : "false ");
            }break;
            case LUA_TNUMBER:
            {
                printf("%g ", lua_tonumber(L, i));
            }
                break;
            default:
            {
                printf("%s ", lua_typename(L, t));
            }
                break;
        }
    }
    cout<<"\nend dump lua stack"<<endl;
}

me = { name = "zilongshanren", age = 27}

//从Lua里面取得me这个table，并压入栈
lua_getglobal(L, "me");
if (!lua_istable(L, -1)) {
    CCLOG("error! me is not a table");
}
//往栈里面压入一个key:name
lua_pushstring(L, "name");
//取得-2位置的table，然后把栈顶元素弹出，取出table[name]的值并压入栈
lua_gettable(L, -2);
//输出栈顶的name
CCLOG("name = %s", lua_tostring(L, -1));
stackDump(L);
//把栈顶元素弹出去
lua_pop(L, 1);
//压入另一个key:age
lua_pushstring(L, "age");
   //取出-2位置的table,把table[age]的值压入栈
lua_gettable(L, -2);
stackDump(L);
CCLOG("age = %td", lua_tointeger(L, -1));

lua_getfield(L, -1, "age");

 //压入另一个key:age
    lua_pushstring(L, "age");
   //取出-2位置的table,把table[age]的值压入栈
    lua_gettable(L, -2);