Qt 面试题您能答对几个

[dbk]

1. How do you expose QML objects to C++

2. Do you know how to design a user interface so that it doesn’t lock up while it’s running?

3. Give me all the ways you know how to multithread in QT

4. How would you detect if QT GUI was going too slow? What would you do to speed it up?

[走好每一步]

1. How do you expose QML objects to C++ QML没学过了，不懂。 2. Do you know how to design a user interface so that it doesn’t lock up while it’s running? 不要在槽函数里做太久时间的work（一般500ms内），timerSlot也一样。 懂消息队列的就很容易明白，不要阻塞你的UI线程! 3. Give me all the ways you know how to multithread in QT QThreadPool，很方便。 继承QThread，运行一次。 MoveThread，令线程变成能处理消息队列的线程 4. How would you detect if QT GUI was going too slow? What would you do to speed it up? 把长时间运行的work丢给线程去运行，干完活了，抛个消息回来给主UI。 跟数据库相关的工作、写磁盘，网络连接等等耗时的操作千万别放在UI线程里跑，不然客户要抓狂。

[cls555]

1、在QT4里面QtScript是对应C++的binding，貌似QT5里面被合并了，5不太了解