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Questions tagged [qt]

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.

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Running a Qt GUI application in Docker on Windows

I have a Docker container based on an Ubuntu 20.04 image. In this Docker container, I want to open a Qt GUI. As host, I am using Windows 10. When having a Linux machine as host, this setup is well ...
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+50

Running Qt app within WinPE

I'd say this is kind of inbetween both SuperUser and StackOverflow, but I am writing a GUI application using Qt that I would like to run within WinPE. I am well aware that WinPE is a very limited ...
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7 views

How to prevent “message” commands in qmake .pro scripts show up as errors in Bamboo logs?

We use Bamboo for CI, and we develop with QT. In the Bamboo logs there are lots of "error" messages in the format error 07-May-2021 04:38:55 Project MESSAGE: ... error 07-May-2021 04:...
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52 views

Which terminal is that?

While watching Introduction tutorial to Qt / QML I noticed Jesper Pedersen from KDAB seems to be using a Windows terminal which is not that old (classic) DOS command prompt I'm used to. Seems to be ...
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35 views

Cannot find qmapboxgl library during Qt5.15 build

I am trying to install MuseScore 3.62 on Ubuntu 20.10. Something has made every recent version of MuseScore uninstallable - running MuseScore-3.6.2.548021370-x86_64.AppImage, as well as 3.6.1, 3.6.0, ...
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12 views

How can I change the last download location in XFCE?

Applications like simple-scan uses one kind of a file-dialog (A) and applications like chromium, telegram, xfce4-screenshooter use some other kind of file-dialog (B). (There are two different kinds of ...
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31 views

Update all GTK and Qt applications' themes on the fly

I use a tool called oomox to generate GTK themes. After I generate the new theme, I would like to run a command that makes all currently open GTK applications use said new theme. I'm pretty sure ...
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103 views

Cannot mix incompatible Qt library (5.14.2) with this library (5.15.1) in debian bullseye

I cannot launch any program that uses Qt since I copied some gl.so manually and/or updated debian bullseye. user@desktop:~$ vlc VLC media player 3.0.11.1 Vetinari (revision 3.0.11.1-0-g52483f3ca2) [...
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16 views

How to get rid of the preinstalled junk that comes with LXQT on a Debian 10 fresh install?

While installing Buster on a virgin machine I dared tick the box that offered to install LXQT Now I have this very smooth LXQT experience albeit packed with software I rather never have e.g the array ...
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66 views

MindMaster mind-mapping tool does not show cloud documents

MindMaster, an app for creating mind-maps, does not show cloud documents. Here is the output from running the app from the command line: QPixmap::scaled: Pixmap is a null pixmap QPixmap::scaled: ...
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0answers
58 views

How to set QT_SCALE_FACTOR for Okular?

Okular's UI elements are too big. After some looking I found that QT_SCALE_FACTOR was set to 2 because my laptop's screen is 4K while my external monitor's is not. Even when my laptop's screen is off ...
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25 views

qt5 applications having disoriented appearance and not functioning properly

For some time vlc hasn't been working properly in my arch linux pc configured with lxDM and XFCE. And, after installing the Wireshark-qt today, I faced a similar problem today with it as it had ...
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2answers
112 views

QT Creator hangs on opening a file or project

My previously installed QT SDK 1.2.1 was working fine. Then, I tried to upgrade it to QT OpenSource 5.6.1. It was working fine. One day, it started hanging on clicking "File--->Open a New File ...
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1answer
174 views

Qt5 on Wayland - how to set keyboard repeat rate?

I'm running SwayWM. I set the keyboard repeat delay and rate in ~/.config/sway/config as: input * repeat_delay 180 input * repeat_rate 50 This works in everything except Qt5 applications. Qt5 ...
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35 views

How to work around this Windows 10 Handwriting Panel / Touch Keyboard Qt text input field bug?

Whenever a character is typed/handwritten in any field in the Qt application Anki it appears and disappears rapidly. (Demonstrated in first gif below.) I filed a bug with Anki developers and they said ...
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0answers
497 views

No matching fbConfigs or visuals found, while openning Qt Creator over SSH

I have Qt 5.12.7 64 installed on Debian 9.12, these are running on vmware on Windows host. Then I use macOS and ssh into debian. And I tried to open Qt Creator and got: $ ~/Qt5.12.7/Tools/QtCreator/...
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42 views

Is my graphics driver and opengl properly installed?

I got some suspicious outputs related to graphics and opengl while looking around an install of Debian 9.12 64 on ThinkPad X200s. Perhaps you guys can tell me if the following looks fine? I tried to ...
18
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1answer
11k views

Can't skip login in Qt installer?

In the past, I have been able to use the Qt installers & maintenance tool without a login by agreeing to GPL licensing and pressing the skip button. But today I discovered that skip button is no ...
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4answers
5k views

Which package provides qmake on Fedora?

I'm having trouble determining the Qt package that provides qmake on Fedora 31. I already installed qt5-designer qconf qt5-devel qt5-qtbase qt5-qtbase-devel qt5-qttools qt5-qttools-devel (and ...
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0answers
915 views

Out-File: cannot find part of path

I tried to follow this tutorial that explains how to download a static mingw builder for Qt, but I got this error. I did follow the steps that were mentioned. Does anyone know how to fix this issue? ...
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237 views

GTK Dark themes on QT applications?

I'm using Arch Linux with Xfce desktop environment. I want to apply Plata GTK DARK theme for QT apps. I've changed /etc/profile, but I've some bugs with themes. Menu called by right-click is with ...
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0answers
353 views

How to change qt5 color scheme permanently?

I am trying to fix some colors in qt5 applications. I'm using a dark theme and some of the text colors are not bright enough on the dark background. However, I am very confused about how to achieve ...
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0answers
120 views

VisualStudio2017-Qt5.12.3 - cannot add msvc2017_64

I want to build a Qt GUI app using VS2017, so I installed VS2017 and Qt5.12.3. And also the VS-Qt add-in. But when I setup this, I can't add msvc2017_64 into it. When I click "Add", there is an ...
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1answer
29 views

Can't install “qt-examples” and “qt-docs” packages because dependency is too new?

What is wrong with my repository? Why can't I install qt-examples? How do I fix the repository? $ sudo yum install qt-examples [...] Error: Package: 1:qt-examples-4.8.7-2.el7.x86_64 (base) ...
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0answers
181 views

Raspberry pi Qt bluetooth module non functional ,dummy backend running

Hello I am working on a project where i use Qt creator on ubuntu 16.04 to cross-compile on raspberry pi 3b +. for my project requirement I need to use Bluetooth with Qt environment hence QtBluetooth ...
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1answer
287 views

Connect to Enterprise WiFi network issue

I configured the Radius Server on Windows Server 2016 and I want to connect to Enterprise WiFi network using my application. I tried to do the following steps: Set the profile without credentials ...
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1answer
26 views

buid qt5.4.1 on centos5.5 error

I'm ready build Qt5.4.1 on Centos5.5, according this https://kate-editor.org/2014/12/22/qt-5-4-on-red-hat-enterprise-5/。 and now i got some problem when build qt src。 when i do the make command, it ...
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0answers
241 views

Error when opening Minergate-gui on Debian 9

I'm trying to install Minergate-GUI on my Debian 9 to mine some coins. I downloaded the Minergate-GUI installation file MinerGate-xFast-GUI-1.5-ubuntu.deb (yes Ubuntu) from the official website and ...
0
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1answer
28 views

Bluetooth characteristics scan

I am developing a bluetooth application for an embedded linux device. On the hardware I have an IMX 6 MCU and EMMY W161 communication module. The operating system is a Yocto Project distribution (Poky)...
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0answers
150 views

Unable to compile out of the box Qt Gui App in the Visual Studio extension C++

I was banging my hand against this wall, attempting to install the qt Visual studio tools, both VS and the Qt extension are the latest 2019 version, with the Qt version 5.13.0: Basically after I've ...
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2k views

Failed to install Qt on Win10 WSL2 (ubuntu 16.04) with error: QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'

When i tried to install Qt on WSL2 ubuntu, i got below errors: root@sun-pc:/mnt/e# ls -l qt* -rwxrwxrwx 1 sun sun 157714525 May 30 09:51 qt-creator-opensource-linux-x86_64-4.9.1.run -rwxrwxrwx 1 sun ...
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1answer
467 views

QT android make returns cannot find -lc++

I'm on Pop!_OS (ubuntu based distro) running Qt creator 4.9.2 with Qt 5.13.0 and am currently trying to build an app for android. When I try to build my app for desktop I have no error, but when I try ...
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0answers
32 views

Source-code-compiled qt on command

Backstory I am using opensuse, there are built-in qt4 and qt5 in my system. I need more complete tools from qt for compiling a file, that’s why I installed from source code via qt website. I have ...
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2answers
2k views

How do I fix this error in VS Code with Python 3 and Anaconda?

How do I fix the error below, so I can open a .jpg image? Warning: QT_DEVICE_PIXEL_RATIO is deprecated. Instead use: QT_AUTO_SCREEN_SCALE_FACTOR to enable platform plugin controlled per-screen ...
8
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1answer
6k views

How to suppress QXcbConnection: XCB error

I'm using KDE Plasma under Arch Linux and there are a lot of logs such as kwin_x11[5129]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 11416, resource id: 56623191, major code: 20 (...
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1answer
93 views

Gimp on W10 install qmlexporter.py

Need you help: I installed GIMP 2.10 and wanted to also use the plugin qmlexporter.py but it will not work, just by putting into the plugin folder. Info states:https://doc.qt.io/qtcreator/quick-export-...
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0answers
51 views

ْQT Creator to use Desktop kit get Error with :“Application finished with exit code 126.”

I am using the QT Creator for my laptop (Linux LMDE 3 Cindy OS) And for Raspberry Cross-compiling. I have installed the QT based of this instruction and by this setting: mkdir ~/raspi cd ~/...
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0answers
525 views

Qt/Qml Error - Qml module not found(QtQuick.Controls.Material)

I recently decided to try out creating a gui for python with pyside and qml. I installed pyqt5, pyside2, qt designer and qt creator. The code I tried seems to work well, however, when I try to use the ...
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0answers
637 views

QT creator - issues getting started

Just finished my python course and trying to get started making GUI applications. Downloaded the open source QT. Running into problems off the bat. I make a new python window application, and keep ...
4
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3answers
10k views

qtpy.PythonQtError: No Qt bindings could be found

I had anaconda running on my machine. few days ago i had to update some of the libraries because they were outdated. after the update, I was not able to launch anaconda-navigator or spyder anymore due ...
1
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1answer
155 views

QT scaling in ubuntu gnome creates big fonts

I'm using Ubuntu 16.04 with gnome, and I'm having scaling problems with some QT applications (VLC, TexStudio). I use a HiDPi external screen and when I disconnect my laptop from the external screen, ...
1
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1answer
121 views

Drag'n'drop doesn't work if app launched via python script from windows powershell

I have a QT app that I download and launch on Windows. If I launch it manually from Windows Explorer, I can use drag&drop to load files. If I launch the very same app via a python script from ...
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0answers
16 views

Compilation issues on a shared project (Qt)

I'm working on an already existing project. So the project folders and files are located in a shared folder (read, write and execute permission for everyone) on the development PC. The project runs ...
2
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0answers
217 views

qmldir: plugin cannot be loaded for module “myplugin”: module namespace QuickQanava

I am using qml with QuickQanava for loading a plugin and I am getting error while loading the 'QuickQanava' plugin from my QML file in windows and I have built my application using Visual Studio. I ...
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1answer
19 views

Random Underlines in QT Program

I found that almost all QT programs have the problem. For instance, VLC OS: Arch Linux QT version: 5.12.1-2 Questions: - Why there are so many random underlines in qt programs? - How to fix that?
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1answer
138 views

#include <QGL> QGL: No such file or directory

I've got a problem my dudes. For a school project, I must install some stuff to use a graphics library in c++. The lib is called libQGLViewer. I'm using Linux Mint. The problem is the following: ...
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1answer
195 views

Create file.desktop on ubuntu for a Qt GUI Script

I have a simple GUI script written in python3 ,Qt5. in folder of project exist an icon folder that are contain icons used in app.I created a app.desktop file in "/usr/share/applications/" : [Desktop ...
3
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1answer
5k views

What is wrong with my Qt environment? It reports “could not find or load the Qt platform plugin ”xcb“ in ”“.”

Five months ago I upgraded from Ubuntu 16.04 to Ubuntu 18.04. Following this upgrade several Qt applications no longer worked for me. Instead of starting up I would see errors such as: $ git cola &...
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0answers
35 views

Caret in Qt application has little triangle on the right

When I type into text field in Qt application (SQLite Studio), I see a little triangle on the right side of blinking caret: Lorem ipsum I pasted to the field using middle click before. This caret is ...
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0answers
106 views

When I copy data from Qt-Creator to Excel, the tabs are turned into spaces

I am using Qt-Creator to edit a file which contains lines of tab delineated data, and I have white-space rendering turned on in Qt-Creator, so I can see the tabs. When I copy this data into an excel ...