This feature is not available right now. Please try again later. Return value from slot in differnet thread | Qt Forum I'd like to get a return value that tells me in the main/GUI thread if everything is ok. I know that slots should be void and should not be used for this, even if they seem to do it. Emit a signal back seems easy. However, I'd like to know the result immediately. Or should I just call it as regular function instead of using the signal/slot ... Inter-Process Communication in Qt | Qt 5.12 The Qt D-Bus module is a Unix-only library you can use to implement IPC using the D-Bus protocol. It extends Qt's Signals and Slots mechanism to the IPC level, allowing a signal emitted by one process to be connected to a slot in another process. The Qt D-Bus documentation has detailed information on how to use the Qt D-Bus module. QProcess Class
@BjornW said in Signal and slot to synchronize variable between qthread: I would separate the objects into two types. One type that is the "master" object and other objects which interact with it. That's the correct thinking, I consider this whole question to be a design issue.
Qt supports these signal-slot connection types: ... communicate between a worker thread and ... Qt signaling across threads, one is GUI thread? - Stack Overflow Jan 18, 2010 ... Qt knows how to take of copy of many C++ and Qt types, but QImage isn't one of them. ... Since signals and slots across threads use queued connections, .... When moving an object between threads, you decide which event ... How Qt Signals and Slots Work - Part 3 - Queued and Inter Thread ... Feb 4, 2016 ... In this article, we will explore the mechanisms powering the Qt queued connections. Summary from Part 1. In the first part, we saw that signals ... Effective Threading Using Qt - John's Blog
Signals & Slots | Qt Core 5.12.3
Problem with QT / Threads / Signals / Slots - C / C++ The Signals and Slots mechanism is synchronous: when a signal is emitted, all slots are called immediately. The slots are executed in the threadQt, threading, Slots, and related things are not defined by the C++ language. They happen to be, therefore, outside the scope of this newsgroup. Qt: Throw exceptions from signals and slots | Notes to… By default, you can not throw exceptions from signals and slots: Qt has caught an exception thrown from an event handler.reimplemented from QApplication so we can throw exceptions in slots virtual bool notify(QObject * receiver, QEvent * event) { try {. QT: работаем с сигналами и слотами QT: работаем с сигналами и слотами. Этот "классический" слегка доработанный пример на сигналы и слоты в QT показывает, как их соединять, как разрывать и возобновлять соединение. Сначала немного теории. В QT реализована концепция функций обратного вызова... Qt5 Tutorial Signals and Slots - 2018
Signals and Slots Across Threads. Qt supports these signal-slot connection types: Auto Connection (default) If the signal is emitted in the thread which the receiving object has affinity then the behavior is the same as the Direct Connection. Otherwise, the behavior is the same as the Queued Connection." Direct Connection The slot is invoked ...
Thread Safety with PySide – Jérôme Belleman Oct 13, 2013 ... For instance, thread safety: what's safe when it comes to signals and slots? ... The Qt documentation on Signals and Slots Across Threads suggests the right connection will be ... The signal is emitted from the auxiliary thread. How to Use the Signal/Slot Communication Mechanism? | ROOT a ... Signals and slots are used for communication between objects. ... The class which corresponds to Qt's QObject is TQObject. ... the full method name will be " SetValue(Int_t)" , where SetValue is the method name and Int_t the prototype string. Qt Thread - [0] - 博客园
QT: работаем с сигналами и слотами
qt - connecting signal/slot across different threads between ...
Reply to Signal/Slot between Threads Qt 5 on Fri, 10 May 2013 08:15:43 GMT There is something that's bothering me with your design. The idea behind signal and slots is that you send a value with a signal to a slot. Qt.ConnectionType If the signal is emitted from the thread in which the receiving object lives, the slot is invoked directly, as with Qt::DirectConnection ; otherwise the signal is queued, as with Qt::QueuedConnection . static Qt.ConnectionType: BlockingQueuedConnection Same as QueuedConnection , except that the current thread blocks until the slot has been ...