Hi People,
![C++ thread signal C++ thread signal](/uploads/1/2/5/2/125219908/380340590.png)
- Hi People, I have a problem with Qt meta-type system and the signal and slot connections. I try to connect a signal and slot with each other. The signal looks like this: @ signals: void sigSaveFileName(QString&); @ and the slot: @ private slots: void slot.
- Signals and slots are used between the counting threads and the main GUI thread for thread safety. The number of boxes and button sets is assigned in 'n' during class declaration. It seems clunky to make a bunch of threads beforehand.
- Both signals/slots (QObject:connect) and QCoreApplication::postEvent are thread-safe and can solve your problem. So events and signal/slots are two parallel mechanisms accomplishing the same things, in general an event will be generated by an outside entity (e.g. Keyboard, Mouswheel) and will be delivered through the event loop in QApplication.
Whenever is star is drawn by the worker thread, it will emit a signal that is connected to the addImage slot. This slot is called with a QRect value, indicating where the star should be placed in the pixmap held by the viewer label, and an image of the star itself. Aug 23, 2019 In this example I can show you how you can implement a custom signal (MySignal) together with the usage of threads with QThread. The following code creates a window with two buttons: the first starts and stop a thread (MyThread) that runs a batch that prints a point in the stdout every seconds continuously. Oct 05, 2013 Contribute to baoboa/pyqt5 development by creating an account on GitHub. More classes have been made usable from non-GUI threads, and the signals and slots mechanism can now be used to communicate between threads. Additionally, it is now possible to move objects between threads.
I have a problem with Qt meta-type system and the signal and slot connections.
I try to connect a signal and slot with each other. The signal looks like this:
I try to connect a signal and slot with each other. The signal looks like this:
@
signals: void sigSaveFileName(QString&);
@
signals: void sigSaveFileName(QString&);
@
and the slot:
@
private slots: void slotPutSaveFileName(QString& name);
@
@
private slots: void slotPutSaveFileName(QString& name);
@
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Before I connect those, I would like register the QString with qRegisterMetaType() method then call connect method:
@
qRegisterMetaType<QString>('QString');
connect(&_worker, &Worker::sigOpenFileName, this, &MainWindow::slotPutOpenFileName);
@
qRegisterMetaType<QString>('QString');
connect(&_worker, &Worker::sigOpenFileName, this, &MainWindow::slotPutOpenFileName);
@
If I run my application, I watch the application output, and I get the following warning:
QObject::connect: Cannot queue arguments of type 'QString&'
(Make sure 'QString&' is registered using qRegisterMetaType().)
QObject::connect: Cannot queue arguments of type 'QString&'
(Make sure 'QString&' is registered using qRegisterMetaType().)
QObject::connect: Cannot queue arguments of type 'QString&'
(Make sure 'QString&' is registered using qRegisterMetaType().)
QObject::connect: Cannot queue arguments of type 'QString&'
(Make sure 'QString&' is registered using qRegisterMetaType().)
and doesn't happen anything :(
Can tell me somebody what I make wrong?
Regards,
Norbert
Norbert
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Hello all !
I have some difficulties to find an appropriate way to solve a problem of communication between objects in differents threads (although I already read the Signals/slots accross threads). Here is my problem:
I have an object a of class A living in a thread T1.
I have an object b of class B living in a thread T2.
I have an object b of class B living in a thread T2.
Both objects a and b can emit signals and have slots to manage the signals emitted by the object living in the other thread (Object a has slots to manage signals from object b, and object b have slots to manage signals from object a). Zodiac casino is it safe.
Once I have moved the object to their respective threads, I connect the signals/slots using Qt::connect(.., Qt::QueuedConnection), but once the signals is emitted, the slot is never executed.
I don't use Qt::DirectConnection (because it's quite the same that invoking directly the method, and I don't want this), and I would like to avoid to manage an event dispatcher or an event loop in the parent thread.
![Signals And Slots Between Threads Signals And Slots Between Threads](/uploads/1/2/5/2/125219908/189020301.png)
Boost Signals And Slots
Does someone know how to use correctly the Qt threads in order to make the communication between signals/slots between objects living in different threads (none living in the main thread) ?
C++ Thread Signal
Thank you a lot for your answers !