You could use the same technique to communicate the results back, but it would probably make more sense to add a signal to the worker object that is emitted when it's done. Attach this signal to a slot of some object living in your main thread and Qt will again take care to execute the slot in the main thread, not in the worker thread. QThread — Qt for Python - doc-snapshots.qt.io From Qt 4.8 onwards, it is possible to deallocate objects that live in a thread that has just ended, by connecting the finished() signal to deleteLater(). Use wait() to block the calling thread, until the other thread has finished execution (or until a specified time has passed). PyQt/Threading,_Signals_and_Slots - Python Wiki Now that we have seen how an instance of the Window class uses the worker thread, let us take a look at the thread's implementation. The Worker Thread. The worker thread is implemented as a PyQt thread rather than a Python thread since we want to take advantage of the signals and slots mechanism to communicate with the main application. Qt Multithreading in C++: The Missing Article | Toptal
Qt - Calling one form from another form - Experts Exchange
Using Qt's Classes in Secondary Threads | C++ GUI ... - InformIT Using Qt's Classes in Secondary Threads. A function is said to be thread-safe when it can safely be called from different threads simultaneously. If two thread-safe functions are called concurrently from different threads on the same shared data, the result is always defined. Qt: Access GUI From Another Thread? - Allegro Is there no way to do the same thing without signal->slot? All I want to do is call a function of my MainWindow class in the context of the GUI thread. It seems silly to have to write another class with signals that match all the slots of the MainWindow, and then inherit that class so that all my workers can throw those signal. How to properly call QMetaObject::InvokeMethod? - GitHub Hey. Yeah, unfortunately is not possible to directly use QMetaObject_InvokeMethod or core.NewQGenericArgument at the moment.. You will instead need to create a helper struct with a custom signal/slot to be able to make all the visual changes in the main thread.
In this example, when we run our code, we get the following dialog: A new thread will be created in the constructor of the dialog. Hitting the "Start" button will trigger slot, and in that slot, start() method of the thread will be called. The start() will call the thread's run() method where a ...
Threaded Fortune Server Example | Qt Network 5.10 We can then call QThread::start(), which starts the thread. QSharedMemory Class | Qt 4.8 You can call nativeKey() to retrieve the native key. If a native key has been assigned, calling key() will return a null string.
Qt 4.8: Threading Basics
QTimer — Qt for Python - doc-snapshots.qt.io To start an event loop from a non-GUI thread, use exec(). Qt uses the timer’s thread affinity to determine which thread will emit the timeout() signal. Because of this, you must start and stop the timer in its thread; it is not possible to start a timer from another thread.
PyQt/Threading,_Signals_and_Slots - Python Wiki
logmessage from another thread to the mainwindow slot | Qt m_window3 to another thread after calling connect()? In that case, it may not work. belive this is what it is. mainwindow logMessage is a private member but guess i will have to make it public to access it from the other thread object. create a connect in the T_editor class that connects the signal logmessage with slot of mainwindow slot. Qt thread: simple, complete and stable (with full sources Jun 02, 2015 · 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). That's why I'm writing this… Qt: Access GUI From Another Thread? - Allegro Aug 02, 2007 · Qt: Access GUI From Another Thread? Billybob. Member #3,136. Is there no way to do the same thing without signal->slot? All I want to do is call a function of my MainWindow class in the context of the GUI thread. It seems silly to have to write another class with signals that match all the slots of the MainWindow, and then inherit that ... Talking to Qt Threads – Dave Smith's Blog - The Smith Fam
Effective Threading Using Qt - John's Blog May 2, 2015 ... Still basic / direct / low level threading (I'll just call this basic) is often seen as ... in a separate class but now you have two classes and the thread subclass ..... using signals and slots Qt handles thread synchronization for you. Communicating with the Main Thread | C++ GUI Programming with ... Nov 6, 2009 ... When a Qt application starts, only one thread is running—the main thread. ... the QApplication or QCoreApplication object and call exec() on it. ... However, when we connect objects that "live" in different threads, the ... The slot is then called by the event loop of the thread in which the receiver object exists. Multithreading with Qt - qtcon QThread is the central class in Qt to run code in a different thread. It's a QObject ... Connect their QObject::deleteLater() slot to the QThread::finished() signal. Slot on main thread not called when signal is emitted from another ...