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Qt is a cross-platform application development framework widely used for the development of application software that can be run on various software and hardware platforms with little or no change in the underlying codebase, while having the power and speed of native applications. Qt is available with both commercial and open source licenses. Questions about programming with Qt should be asked on Stack Overflow.

143 questions
0 votes 0 answers 6 views

Where is Qt installed on Mac?

I have just did brew install qt and now I am looking for where Qt is installed. Does anybody know where is the Qt directory? I don't know how to find it. user avatar Holding Arthur
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0 votes 0 answers 6 views

luckybackup-pkexec (as root) fails in Linux Mint Cinnamon 20.3

I tested the failure in the terminal of its app's source folder to see the errors. The question is, what is needed to re-install, Qt? because the app has been purged and reinstalled twice. root@... user avatar ineuw
  • 13
0 votes 0 answers 5 views

System-wide stylesheet override for Qt applications on Linux

Many Qt applications come without option to set dark/custom theme within them. I found a way to override stylesheet for single application using -stylesheet command line option. Is there a way to make ... user avatar pvc
  • 359
0 votes 0 answers 243 views

"This application failed to start because no Qt platform plugin could be initialized"

I have created a Kali-Linux environment on Windows using Oracle VM VirtualBox 6.1.32. I've been trying to run wireshark on kali-linux. But when I type wireshark in the terminal, I get this error. I've ... user avatar Sunghyeon Lee
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3 votes 1 answer 4k views

Kiosk mode and auto login and single application mode in CentOS

We have a machine running CentOS 7, GDM, KDE 11 (installed from CentOS DVD) We have been struggling a few days with this issue, tried to search for a solution but unfortunately most of the material'... user avatar CommunityBot
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0 votes 0 answers 12 views

Wacom tablet clicks are mispostioned on some (Qt?) UI elements

I have a Wacom tablet and stylus which works on Ubuntu. However, some UI elements receive mispositioned clicks. e.g. Firefox (which uses gtk) receives clicks correctly, but Krita (which uses Qt) ... user avatar Hennes
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1 vote 2 answers 3k views

Installing Qt on an AWS instance

I would like to install the Qt development library on an AWS instance. Running > yum search qt | grep devel on an AWS t2.micro instance produces no matches. Does one have to install Qt from ... user avatar user3027198
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2 votes 0 answers 237 views

Qt5's QPA can not connect to my display?

I am trying to launch the Garuda Boot Manager and get this: qt.qpa.xcb: could not connect to display :0 qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though ... user avatar Ingwie Phoenix
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0 votes 0 answers 34 views

Arch Linux on Pi4 double display

I'm trying to build a Qt double display Application on Raspberry Pi4 with Arch linux. But my Rasp cannot find the two HDMI displays. " [root@trolly home]# xrandr Can't open display " How can ... user avatar Gantendo
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0 votes 1 answer 45 views

Is there a way to search for Cygwin packages by command, and then download the package, and all its dependents?

I'm currently trying to use a program called Paml, in Cygwin but to initially configure it I need to use the "qmake" command in a Cygwin which as far as I can tell, seems to be part of the ... user avatar matzeri
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0 votes 0 answers 79 views

How to force resolution in VirtualBox headless mode?

Many will ask why? So, I have some automatic tests implemented using QtTest for my GUI application. I need to trigger them by my CI each time someone commits something. Application needs to be ... user avatar Piotr Zych
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0 votes 0 answers 28 views

How do I stop "Maintain QT" from appearing on Windows Boot?

Everytime I restart Windows, the QT creator shows up: Also I noticed this is running from this Start Menu/Programs/Startup/ folder, I don't know why this is there: Finally, I noticed that when I ... user avatar Bersan
  • 101
1 vote 0 answers 58 views

QT5 theme not applied on my own applications

I set QT_QPA_PLATFORMTHEME=qt5ct at login. Installed applications such as designer and qt5ct itself respect that, and use the theme. However, the applications I make or build myself (e.g. python ... user avatar Gauthier
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0 votes 0 answers 23 views

Metacity configured in composition mode shows a gray background on the LCD displays

Within my bash script I replace the Window Manager on Linux to Metacity, the source code is: metacity --replace --composite & This script is executed on a Red Hat 7 platform. For some reasons the ... user avatar Maarten
  • 1
2 votes 1 answer 167 views

How to record a Qt5 application window with minimal to zero CPU overhead on Windows or Linux?

I'm writing a real-time volume rendering application that runs purely on the CPU. It's quite fast but nevertheless the more CPU power the better for interactivity - basically, I'm designing it to use ... user avatar iksemyonov
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