item->write(msg.toLatin1(), length)什么意思 [复制链接]

for(int i=0;i<tcpClientSocketList.count();i++)
{
     QTcpSocket *item=tcpClientSocketList.at(i);
     if(item->write(msg.toLatin1(), length)!=length)
     {
         continue ;
     }
}

大虾求教：
            tcpClientSocketList.at(i)中的at()是啥意思？

            还有item->write(msg.toLatin1(), length)怎么解释哟？

我有查资料，都没怎么说，看了也不知道它说什么。求教！
谢谢~~

qint64 QIODevice::write ( const char * data, qint64 maxSize )
Writes at most maxSize bytes of data from data to the device. Returns the number of bytes that were actually written, or -1 if an error occurred.
找下父类的帮助

const T & QList::at ( int i ) const
Returns the item at index position i in the list. i must be a valid index position in the list (i.e., 0 <= i < size()).

明白了 谢谢~~