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. Worker thread stops processing events during infinite loop ... 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 ...
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 ...
Qt Development General and Desktop Displaying data in QTable Widget using Infinite loop Displaying data in QTable Widget using Infinite loop. This topic has been deleted. Only users with topic management privileges can see it. 17mdinesh. last edited by . I m a newbie to Qt Development you can even say that i m new to C++ also consider my QThread loop and QTimer | Qt Forum 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. Qt Toolkit - Signals and Slots
Signals & Slots — Qt for Python
c++ - Qt Signal Slot Architecture Unwanted Infinite Loop ... I've problem with qt signal-slot system. First I've created a class which is called System in Singleton pattern, so I can access it's instance where I want. System has a signal SelectionChanged. I've a list widget and I am connecting it's itemSelectionChanged signal to my custom slot which is called onSelectionChanged. Signals & Slots | Qt 4.8 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. Infinite loop and signal deluge | Qt Forum
Displaying data in QTable Widget using Infinite loop | Qt ...
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. [QTBUG-56280] Resizing widget that has ... - Qt Bug Tracker No reviews matched the request. Check your Options in the drop-down menu of this sections header. Signals and Slots in Depth | C++ GUI Programming with Qt4 ... If the parameter types are incompatible, or if the signal or the slot doesn't exist, Qt will issue a warning at run-time if the application is built in debug mode. Similarly, Qt will give a warning if parameter names are included in the signal or slot signatures. So far, we have only used signals and slots with widgets.
I have a QWebView that opens a local web page on my computer, and everything works perfectly in Qt4.8. (It also works with a browser). But after porting the software to Qt5.0.2 (and making the change from QWebView to QtWebKitWidgets/QWebView, the program appears to hang, then crashes with the following output:
c++ - SLOT СИГНАЛОВ И Infinite Loop Когда вы вызываете 'setValue' без сигналов блокировки, Qt вызывает сигнал и рекурсивно вызывает подключенные слоты. Если 'setValue' вызывается одним слотом, это приводит к бесконечной рекурсии. Когда вы вызываете 'blockSignals (true)', объект перестает посылать... Qt: Signals & 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 differs most from the features provided by other frameworks. A callback is a pointer to a function, so if you want a processing function to notify you... Сигналы и слоты в Qt / Хабр
Signals and slots between objects in different threads in Qt Signals and slots between objects in different threads in Qt. Ask Question 0. ... I understand of your messages that I must change myprocess method because with this infinite loop the system can't process the events loop. Correct? I read the Qt documentation, but sometimes I don't know how to do it. ... Qt: Signal/Slot not working after QObject ... Signal and Slot Two Threads | Qt Forum I have a Problem. I am using 2 Threads, so that my GUI cannot lock up. I start both threads and htop is showing me two threads. For now, I force my working thread to enter an infinite loop once a slot is triggered. In my GUI Thread I emit the correspondin... Displaying data in QTable Widget using Infinite loop | Qt ... Qt Development General and Desktop Displaying data in QTable Widget using Infinite loop Displaying data in QTable Widget using Infinite loop. This topic has been deleted. Only users with topic management privileges can see it. 17mdinesh. last edited by . I m a newbie to Qt Development you can even say that i m new to C++ also consider my ...