: error: 'exec' is a protected member of 'QThread'
时间: 2023-12-01 16:04:22 浏览: 37
这个错误是因为在Qt中,QThread的exec()方法被保护起来,不能直接调用。如果你需要在QThread中执行一些操作,可以通过创建一个新的QObject子类,并将其移动到线程中来实现。
例如:
```cpp
class Worker : public QObject
{
Q_OBJECT
public slots:
void doWork() {
// 这里是你要执行的操作
}
};
class MyThread : public QThread
{
Q_OBJECT
public:
void run() override {
Worker* worker = new Worker;
connect(this, &MyThread::started, worker, &Worker::doWork);
exec();
delete worker;
}
};
```
这样,当你启动MyThread时,它将创建一个Worker对象,并将其移动到线程中。然后,它将连接线程的started()信号到Worker的doWork()槽上,并且调用exec()方法来启动事件循环。当你停止线程时,它将退出事件循环并删除Worker对象。
相关问题
qthread::msleep和qthread::sleep差别
qthread::msleep()和qthread::sleep()是QThread类中的两个成员函数,用于线程的睡眠操作。它们的主要区别在于时间单位的精度不同。
qthread::msleep()函数以毫秒为单位进行睡眠,可以精确到毫秒级别。而qthread::sleep()函数以秒为单位进行睡眠,只能精确到秒级别。
因此,如果需要更精确的睡眠时间,可以使用qthread::msleep()函数;如果对时间精度要求不高,可以使用qthread::sleep()函数。
QThread: Destroyed while thread is still running
This error message occurs when a QThread object is destroyed while the thread it represents is still running. This can cause issues such as memory leaks and unpredictable behavior.
To avoid this error, you should ensure that the QThread object is deleted only after the thread has finished running. You can do this by connecting the QThread::finished() signal to a slot that deletes the QThread object.
For example:
```cpp
QThread* thread = new QThread();
MyObject* object = new MyObject();
// Move the object to the thread
object->moveToThread(thread);
// Start the thread
thread->start();
// Connect the finished() signal to a slot that deletes the thread
QObject::connect(thread, &QThread::finished, thread, &QThread::deleteLater);
// Do some work with the object
object->doWork();
// Wait for the thread to finish
thread->wait();
// The thread has finished, so delete the object
delete object;
```
In this example, the QThread object is deleted only after the thread has finished running, ensuring that there are no issues with the thread object being destroyed while the thread is still running.