20 ways to debug Qt signals and slots | Sam Dutton's blog Oct 3, 2008 ... Use break points or qDebug to check that signal and slot code is definitely ... where I can watch Qt execute and know pretty quickly what's gone wrong. ... Another option might be turning on Qt's logging, but I've never tried it or ... QObject thread-safety If you have not explicitly connected any signals or slots, and the only events you ... get events from another thread if you send signals but do not get any signals and ... But if you are not in the Qt event thread then you need to call disconnect() in ...
Qt Multithreading in C++: The Missing Article | Toptal
Oct 16, 2017 ... Like most GUI frameworks, event handling in Qt by default happens on .... call it after each file conversion for example in the slot that handles ... Qt 4.4.3: Thread Support in Qt - Huihoo QtConcurrent::run() runs a function in another thread. QFuture represents ... via QFuture. QFutureWatcher allows monitoring a QFuture using signals-and-slots. Copied or Not Copied: Arguments in Signal-Slot Connections ... Jun 29, 2013 ... How does the behaviour differ for direct and queued signal-slot ... The Qt documentation doesn't say a word about it. ... The class – let's call it Copy – looks as follows. .... Even if the sender of the signal and the receiver of the slot are in different threads, we should still pass arguments by const reference. Qt ... qthread.cpp source code [qtbase/src/corelib/thread/qthread.cpp ... 205, event loop by calling exec() and runs a Qt event loop inside the thread. 206. 207, You ... 215, is safe to connect signals and slots across different threads,.
The event loops of Qt are a very valuable tool for inter-thread communication. Every thread may have its own event loop. A safe way of calling a slot in another thread is by placing that call in another thread's event loop. This ensures that the target object finishes the method that is currently running before another method is started.
Communicating with the Main Thread - InformIT
Josh Knows | PothosGui: created basic control widgets
The thread that delivers the event will release the semaphore right after the slot has been called. Meanwhile, the thread that called the signal will acquire the semaphore in order to wait until the event is processed. Qt Multithreading in C++: The Missing Article | Toptal What Qt spec says about thread-affinity: timers started in one thread, cannot be stopped from another thread. And only the thread owning a socket instance can use this socket. What do I do if a slot is not invoked? - KDAB All Qt developers have asked themselves at least once in their careers: “why isn’t my slot invoked?” (I’ve asked myself that question many, many times). There are a number of reasons why a connection may fail to be properly set up, and … Qt Toolkit - Thread Support in Qt
In this blog post, we will see the implementation details behind the new function pointer based syntax in Qt5.
You can call nativeKey() to retrieve the native key. If a native key has been assigned, calling key() will return a null string.
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…