If you’re a Qt developer, you surely are aware of the fact that you can only display GUI elements and access them from the main thread. This limitation as far as I know is mostly bound to the limitations of X and it isn’t to exclude that multithreading support for GUIs will be added soon.

1. Qt Gui From Thread Chart

Qt Gui From Thread Chart

This limitation never caused me any trouble, since the signal & slots mechanism is thread-safe and communicating between threads and GUI elements can be achieved through it. However, yesterday I needed to show a messagebox in a method and, in case the code is not executing in the main thread, show a native win32 MessageBox instead of a QMessageBox (of course, only on Windows can I do that, on other platforms when I’m not in the main thread, I won’t show anything). Anyway, here’s a simple method to establish if we’re running the GUI thread.

Qt5 Tutorial QThreads - Gui Thread. In this tutorial, we will learn communication between threads and GUI control. We'll use Qt Gui Application with. Tutorial covering basics of PyQt Threading with real life. Getting Qt Designer. As post title to our main UI thread so that we can update the. QT application GUI on Ubuntu 16.04 freezes. What we are using - Intel Celeron dual core 1.6GHz, RAM 2GB, 128gb SSD. We have used two smart cameras (ethernet). We have used QNetworkmanager to grab images from the cameras.

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