Qt signal slot main thread

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Thread is surely one of the most discussed topic on Qt forums. Meanwhile, I never managed to find a simple example which describes how to simply do what I want to do: run a thread to do things and interrupt it if necessary (for example if the GUI is closed).

How to Use Signals and Slots - Qt Wiki A developer can choose to connect to a signal by creating a function (a slot) and calling the connect() function to relate the signal to the slot. Qt's signals and slots mechanism does not require classes to have knowledge of each other, which makes it much easier to develop highly reusable classes. Lock Free Multithreading in Qt – Dave Smith's Blog This might sound somewhat uninteresting at first, but it means you can have your own signals and slots outside the main thread. The Trolls created a new way to connect signals to slots such that signals can actually cross thread boundaries. I can now emit a signal in one thread and receive it in a slot in a different thread. Qt thread: simple, complete and stable (with full sources on ...

Communicating with the Main Thread | C++ GUI ... - InformIT

A frequent question coming up when programming with PyQt is how to pass extra arguments to slots.Basics of QThread usage without sub classing. connect signals and slots between various. Python Signal And Slots Example

PyQt/Threading,_Signals_and_Slots - Python Wiki

Welcome to the Qt wiki Welcome to the Qt wiki. Here the Qt community has gathered information on Qt over the years. Everything here is created and maintained by the community. Please take a look at the below information before you start contributing. Qt for Beginners - Qt Wiki This section can be skipped for now if you only want to program with Qt. Just know that you need to put SIGNAL and SLOT around the signals and slots while calling connect. If you want to know how Qt works, it is better to read this. The Meta Object. Qt provides a meta-object system. Meta-object (literally "over the object") is a way to achieve ...

Sep 30, 2009 ... I can now emit a signal in one thread and receive it in a slot in a ... in the main event loop doesn't know anything about multi-threading, locks, ...

@artwaw That's absolutely not going to work. Widgets shouldn't be moved to other threads. All ui code needs to run in the main thread. @inforathinam Qt's signal/slot connections do (by default) a runtime check at the time of signal emission. If both sender and the receiver live in the same thread then a direct connection is performed i.e. the slot is invoked in the same thread as the signal ... Threading Basics | Qt 5.12 The Qt GUI must run in this thread. All widgets and several related classes, for example QPixmap, don't work in secondary threads. A secondary thread is commonly referred to as a "worker thread" because it is used to offload processing work from the main thread. Simultaneous Access to Data aboutToQuit() signal question | Qt Forum The aboutToQuit() signal is on my main application thread, so processEvents() would only act on those events. And that's what you want. When you emit a signal in the comm thread connected to an object in the main thread it posts a queued signal event in the main thread's event loop.