cocos2dx 读取文本行数

std::u16string _str16;
StringUtils::UTF8ToUTF16(str,_str16);

int _nums  = _str16.length();

int _lines = _nums/words + (_nums%words==0?0:1);


if (_nums==0)
{
    CCAssert(0,"error");
}
if (_lines == 1)
{
    return 0;
}
return _lines;