How to process events during infinite loop in Worker ... I've created a Worker object in Qt to process video input indefinitely, and then move it into a QThread to keep the UI thread going. The problem is, I designed it such that the video capture function runs in an infinite loop until interrupted by a flag, and the flag was supposed to be set by a slot in the Worker object, but since the Worker object is inside the infinite loop, it never ... Effective Threading Using Qt - John's Blog Effective Threading Using Qt. ... It’s to demonstrate infinite tasks unlike CountWorker which demonstrates finite tasks. The key to his worker is the stopWork slot. Calling this sets sets a flag to let the worker’s doWork function to exit. ... When passing data between threads using signals and slots Qt handles thread synchronization for you. Signals and Slots - PyQt Programming - pythonstudio.us These signals can be connected to any callable, that is, to any function or method, including Qt slots; they can also be connected using the SLOT() syntax, with a slotSignature. PyQt checks to see whether the signal is a Qt signal, and if it is not it assumes it is a Python signal.
Displaying data in QTable Widget using Infinite loop | Qt ...
I think I have some fundamental misunderstanding of how the Qt signal/ slot mechanism works. I have worked through example programs and they make sense but when I've tried to take those andIs the way I am using the signal/slot to modify things in a coupled fashion creating an infinite loop? Qt-сигналы и слоты, потоки, app.exec () и связанные… Сообщества (370) c++ qt signals-slots. Qt-сигналы и слоты, потоки, app.exec () и связанные запросы.Я написал этот фрагмент кода, чтобы понять, как работают сигналы и слоты qt. Мне нужно, чтобы кто-то объяснил это поведение и сказал мне, правильно ли я по поводу моих... Qt 4.3: Сигналы и слоты Механизм сигналов и слотов - это основная особенность Qt и, вероятно, основная часть Qt, которая больше всего отличается от особенностей других структур.В Qt мы ввели технику, альтернативную отзывам: Мы используем сигналы и слоты. c++ Qt Signal Slot Architecture Unwanted Infinite Loop? -… I found my solution in QObject::blockSignals() method. It will prevent emitting signals from the list widget while I am setting selected items. Thanks for all the answers and solutions especialy for BartoszKP's. This solution is looks like the official way of his first solution.
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Terminate QThread correctly | Qt Forum You stopped the loop in ThreadWorker, but you didn't stop the loop in QThread. As @J-Hilk said, you need to call threadController->quit() too. @Andrea said in Terminate QThread correctly: I've read the QThread Basics docs and also had a look on StarckOverflow and the Qt forum, but still having the doubt. Qt 4.3: Signals and Slots Signals and Slots. In Qt, we have an alternative to the callback technique: We use signals and slots. A signal is emitted when a particular event occurs. Qt's widgets have many predefined signals, but we can always subclass widgets to add our own signals to them. A slot is a function that is called in response to a particular signal. Qt in Education The Qt object model and the signal slot ... The QObject QObject is the base class of almost all Qt classes and all widgets It contains many of the mechanisms that make up Qt events signals and slots properties How to process events during infinite loop in Worker ...
Essentially, an event loop IS an infinite loop. It cannot coexist with another infinite loop on the same thread. [quote author="aenima1891" date="1373641819"]I'd like to use an infinite loop because i want to simulate on a desktop pc an embedded firmware, which is composed by an infinite main loop and a timer with its interrupt.
c++ qt signals-slots | this question edited Dec 23 '13 at 12:45 asked Dec 23 '13 at 12:16 Cahit Burak Küçüksütcü 198 3 20 As a similar with BartoszKP's second solution, I've found a solution too. QObject has a blockSignals() method to prevent emitting inner signals. Qt na mobilních zařízeních
qt-signals сигналы - C++Qt сигнал и слот не срабатывают
Qt 4.6: Signals and Slots Signals and slots are used for communication between objects. The signals and slots mechanism is a central feature of Qt and probably the part that differsNote that the setValue() function sets the value and emits the signal only if value != m_value. This prevents infinite looping in the case of cyclic... Qt signal & slot — Development — Форум
@VRonin said:. I thought the order of execution of slots should not be considered deterministic. When across threads it can't be deterministic. When using Qt::DirectConnection (I think it's documented) the order is in the order of connects.. Or does that rely on the fact that the first connection is implicitly a directconnection while the second is a queuedconnection? if that is the case then ... Qt Toolkit - Signals and Slots The signal/slot mechanism is a central feature of Qt and probably the part that differs most from other toolkits. In most GUI toolkits widgets have a callback for each action they can trigger. This callback is a pointer to a function. In Qt, signals and slots have taken over from these messy function pointers. Signal and slot to synchronize variable between qthread ... The signal and slot approach works well when the objects live in the same thread, but in this case it generates a loop as you can see in the output. What I'm expecting is the first 4 rows of the output and stop, but with this code the output is an infinite loop. Thank you for your help. V. myclass.cpp