线程完成后如何 运行 我的 Qt 函数?
How can I run my Qt function after a thread has finished?
void MainWindow::on_pushButton_clicked()
{
QFuture<int> future = QtConcurrent::run(identify); //Thread1
if (future.isFinished())
{
//DoSomething();
}
}
我有这个代码。我想在识别功能完成 运行ning 后 运行 DoSomething()
功能。可能吗?
您可以将 QFuture
对象传递给 QFutureWatcher
并将其 finished()
信号连接到函数或插槽 DoSomething()
。
例如:
void MainWindow::on_pushButton_clicked()
{
QFuture<int> future = QtConcurrent::run(identify); //Thread1
QFutureWatcher<int> *watcher = new QFutureWatcher<int>(this);
connect(watcher, SIGNAL(finished()), this, SLOT(doSomething()));
// delete the watcher when finished too
connect(watcher, SIGNAL(finished()), watcher, SLOT(deleteLater()));
watcher->setFuture(future);
}
void MainWindow::DoSomething() // slot or ordinary function
{
// ...
}
或者您可以使用嵌套事件循环来保持 GUI 的响应速度,并将所有内容都放在同一个函数中:
void MainWindow::on_pushButton_clicked()
{
QFuture<int> future = QtConcurrent::run(identify); //Thread1
QFutureWatcher<int> watcher;
QEventLoop loop;
// QueuedConnection is necessary in case the signal finished is emitted before the loop starts (if the task is already finished when setFuture is called)
connect(&watcher, SIGNAL(finished()), &loop, SLOT(quit()), Qt::QueuedConnection);
watcher.setFuture(future);
loop.exec();
DoSomething();
}
我喜欢这种通话布局。
auto watcher = new QFutureWatcher<int>(this);
connect(watcher, &QFutureWatcher<int>::finished,
[watcher, this] ()
{
watcher->deleteLater();
auto res = watcher->result();
// ...
});
watcher->setFuture(QtConcurrent::run(identify, param1, param2));
void MainWindow::on_pushButton_clicked()
{
QFuture<int> future = QtConcurrent::run(identify); //Thread1
if (future.isFinished())
{
//DoSomething();
}
}
我有这个代码。我想在识别功能完成 运行ning 后 运行 DoSomething()
功能。可能吗?
您可以将 QFuture
对象传递给 QFutureWatcher
并将其 finished()
信号连接到函数或插槽 DoSomething()
。
例如:
void MainWindow::on_pushButton_clicked()
{
QFuture<int> future = QtConcurrent::run(identify); //Thread1
QFutureWatcher<int> *watcher = new QFutureWatcher<int>(this);
connect(watcher, SIGNAL(finished()), this, SLOT(doSomething()));
// delete the watcher when finished too
connect(watcher, SIGNAL(finished()), watcher, SLOT(deleteLater()));
watcher->setFuture(future);
}
void MainWindow::DoSomething() // slot or ordinary function
{
// ...
}
或者您可以使用嵌套事件循环来保持 GUI 的响应速度,并将所有内容都放在同一个函数中:
void MainWindow::on_pushButton_clicked()
{
QFuture<int> future = QtConcurrent::run(identify); //Thread1
QFutureWatcher<int> watcher;
QEventLoop loop;
// QueuedConnection is necessary in case the signal finished is emitted before the loop starts (if the task is already finished when setFuture is called)
connect(&watcher, SIGNAL(finished()), &loop, SLOT(quit()), Qt::QueuedConnection);
watcher.setFuture(future);
loop.exec();
DoSomething();
}
我喜欢这种通话布局。
auto watcher = new QFutureWatcher<int>(this);
connect(watcher, &QFutureWatcher<int>::finished,
[watcher, this] ()
{
watcher->deleteLater();
auto res = watcher->result();
// ...
});
watcher->setFuture(QtConcurrent::run(identify, param1, param2));