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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:
- Qt is well known for its signals and slots mechanism. But how does it work? In this blog post, we will explore the internals of QObject and QMetaObject and discover how signals and slot work under the hood. In this blog article, I show portions of Qt5 code, sometimes edited for formatting and brevity.
- Signals and slots were one of the distinguishing features that made Qt an exciting and innovative tool back in time. But sometimes you can teach new tricks to an old dog, and QObjects gained a new way to connect between signals and slots in Qt5, plus some extra features to connect to other functions which are not slots. Let’s review how to get the most of that feature.
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.
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).
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.
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) ?
Thank you a lot for your answers !
Signals and Slots Across Threads Qt supports these signal-slot connection types:. Answered Jul 27 '17 at 16:16.Microsoft.com. https://nintracking.netlify.app/gold-mountain-casino-ardmore-oklahoma.html.
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pyqtSlot(int) def on_spinbox_valueChanged(self, i):
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This application makes use of > signal slot communication between QObjects living in different threads > (worker and GUI). Archived from the original (PDF) on 2015-04-30.In the case of passing objects between threads using signals and slots a copy will be passed to the slot.
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- Name – the name of the signal.Also, SATA uses some of the special characters defined in 8b/10b.
- Archived from the original on 2014-08-25.
- The key to his worker is the stopWork slot.
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GUIs built with Qt
It is also designed according to an SOA architecture with socket based connection and using IEC AIS standardized protocol all the way to the VTS users. QMutex m_mutex; bool m_stop; void run() { qDebug()<<'From worker thread:
Signal And Slot In Qt
Use the QObject::moveToThread() function to change the thread affinity for an object and its children (the object cannot be moved if it has a parent). The qRegisterMetaType() function is used to make the type available to non-template based functions, like the queued signal and slot connections.
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This is a sequence of 01. Public QObject.
But, the result of the example is From main thread: It emits signals to indicate that the thread started or finished executing, and provides a few slots as well.
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