2012年9月13日 · Qt can't do anything automatically for you unless you yield to the event loop. For maximimum responsiveness you might consider running your process in a separate thread and use signal/slot connections (which are thread-safe by default) to signal to your main GUI thread when your processing is complete.

I have a Qt GUI application running on Windows that allows command-line options to be passed and under some circumstances I want to output a message to the console and then quit, for example: int ...

2011年10月8日 · I'm wondering how to develop visually modern, with attractive GUI applications in QT. When I run QT Creator and start new project, the GUI looks very basic and "pure", just like simple win32 apps. But look for example at Allegorithmic Substance Designer 2, where GUI looks somehow similar to WPF. There are many other applications with nice ...

2021年1月9日 · This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb. So I searched for how to do this. I found GUI Qt Application in a docker container, and based on that called it with

2014年10月27日 · I have an application that when run through terminal, the user has the option between command-line mode or GUI mode. There doesn't seem to be any output to the console at all when using std::cout . std::cout statements don't work in the main event loop.

2017年8月7日 · Basically, Qt has one thread dealing with the GUI (typically the main thread). Any objects specific to this thread will be blocked by GUI work. You need to keep the GUI outside of your interacting partners. To be more specific, your Engine object resides in the GUI/main thread.

I want it to be able to subscribe to ROS2 topics and update the GUI according to the messages received, and publish data when a button is clicked. The problem is that Qt requires app.exec() , and ROS requires node.spin() to be run, both of which are infinite loops.

If you want your application's main window to occupy the whole screen as soon as it starts, use QWidget::showMaximized, e.g.

2015年12月7日 · Main GUI thread operated by Qt QApplication::exec; TCP network thread operated by boost::asio::io_service; TCP events, such as connecting or receiving data cause changes in GUI. Most often, those are setText on QLabel and hiding various widgets. Currently, I am executing those actions in TCP client thread, which seems quite unsafe.

2015年3月24日 · OpenCV recently upgraded its display window, when it is used in Qt. It looks very good, however I did not find any possibility for it to be embedded into an existing Qt GUI window. The only possibility seems to be the creation of a cvNamedWindow or cv::namedWindow, but it creates a free-floating independent window.