Questions tagged [qt]
a cross-platform application framework for developing application software
122
questions
0
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1
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9
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PyQt5 Widget Background Color Incorrect on my Pi
I have searched high and low for this problem, but cannot find anything anywhere.
I have Python Version 3.8.10 and PyQt5 version 5.15.10 running in a Virtual Environment on my Py4 with 8Gb Memory ...
- 11
1
vote
0
answers
43
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Process/Flow/steps for speeding of the booting time in raspberry pi for the cluster
I am using Raspberry pi for the cluster, that would display the basic data like the CAN data and one wire data.
For can I used the Can-Socket and for one wire I am just reading a gpio pin of raspberry ...
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0
votes
1
answer
445
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Running python GUI application with PyQt and python-vlc as a service
I'm trying to run a python GUI application as a service. The application is using PyQt5 and python-vlc packages. I have the following service file:
[Unit]
Description="Python VLC Service Test&...
CommunityBot
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1
vote
1
answer
796
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Download QT 5.12.0 on my Raspberry fails
I currently have the 5.11.3 Qt Version on my Raspberry 3 B+. For another program, I want to use I need at least Qt 5.12.0.
When I try
sudo apt-get install qt5-default
it says that I already ...
CommunityBot
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1
vote
1
answer
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SIP Generator Error Installing ROS Melodic on Raspberry Pi 4
I've been attempting to install ROS Melodic on my Raspberry Pi 4 (running Raspbian Stretch) according to the instructions on this webpage:
[https://www.instructables.com/id/ROS-Melodic-on-Raspberry-...
CommunityBot
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0
votes
1
answer
51
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Pi Zero W goes black screen while running pyqt qml app
I wrote a pyqt5 app that uses QQmlApplicationEngine to load a qml file for the GUI. Now everything runs well on my PC and also on Raspberry Pi4b, but when I am trying to run it on Pi Zero W, it loads ...
3
votes
1
answer
62
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magnetic field generated by the engine alternator affects gpio value
I am working on a dashboard for a motorcycle. I created a Qt application on my raspberry pi 4 on a raspberry pi os lite.
I have configured one of my GPIO as interrupt using the wiringPi library.
...
CommunityBot
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0
votes
1
answer
95
views
Qt6 compiler binary package
I'm aware I can cross-compile Qt6 on my dev machine or I can build the Qt6 from sources directly on the Rapsberry Pi.
But is there any binary package for the compiler? Like when you use the online ...
CommunityBot
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2
votes
1
answer
61
views
Compile Qt application on Raspberry Pi and Run that application on other ARM device. Will it work?
I am compiling One Qt application on Raspberry Pi and Run it on different ARM device like Microchip or TI board without compile again. will it work??? if both the side Qt version is same.
CommunityBot
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1
vote
1
answer
3k
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(Error trying to run qjackctl) libEGL warning: DRI2: failed to authenticate qt5ct: using qt5ct plugin
Running Raspbian installed with NOOBS. qjackctl is installed with all its dependencies using Synaptic. Just trying to run Guitarix on my Pi3 B+. I tried following the instructions in this solution, ...
CommunityBot
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1
vote
1
answer
1k
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QCamera get error "mesa-loader failed to retrieve device information"
Qt test code:
QCamera* camera = new QCamera;
auto viewfinder = new QCameraViewfinder();
camera->setViewfinder(viewfinder);
viewfinder->show();
camera->start();
Output:
mesa-loader failed ...
CommunityBot
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2
votes
1
answer
1k
views
Unable to drag and drop widgets in Qt Designer
I got a Qt 4 installation using sudo apt-get install qtcreator. I am able to get everything to compile using gcc 4.8. However, when it comes to using Qt Designer to edit the UI of a window, Qt ...
CommunityBot
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1
vote
0
answers
160
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Example of libcamera with Qt6 in c++?
I'm trying to build a Qt app on my RPi4 using libCamera in c++, but I keep having build/compile issues. Are there any examples of using libCamera in a Qt app in c++?
I'm using Raspbian bullseye, and ...
- 35
8
votes
2
answers
3k
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QtMultimedia on RaspBerry Pi
I've been trying to get QtMultimedia working on Raspberry Pi for a few weeks now, cross-compiling using the BakeQtPi script, yet the QtMultimedia plugin never seems to find an appropriate service to ...
- 242
0
votes
1
answer
4k
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How to install PySide2 on RaspberryPi?
i use this command to install PySide2:
$ pip3 install pyside2
and i get this error:
ERROR: Could not find a version that satisfies the requirement pyside2 (from versions: none)
ERROR: No matching ...
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0
votes
1
answer
233
views
How can I use the free version of Qt to create a GUI for the Raspberry Pi?
I am working on a project that requires high-medium quality GUI. I am thinking of cross compiling from Windows to Raspberry Pi or from Ubuntu to Raspberry Pi. Also, I do not know which one of those ...
CommunityBot
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2
votes
1
answer
363
views
Unable to get Qt5 audio to work using pulseaudio on Rpi 4
I'm on Raspberry pi 4 and the OS is DietPi
I configured ALSA so I could play an audio file successfully through HDMI using aplay [an audio file]
Then launched the PyQt5 app but got PulseAudioService: ...
CommunityBot
- 1
2
votes
1
answer
566
views
No audio through 3.5mm jack when using QtMultimedia on RPI4B
I am currently trying to run a PYQT5 GUI on my RPI 4B using PYQT5 and its QtMultimedia.
I have 2 speakers (running through an amp) connected through the 3.5mm jack (BMC2835 headphones), and while ...
CommunityBot
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0
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0
answers
119
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PyQt QSoundEffect not working on Pi 4B
I am having a perplexing difficulty, in that I cannot get my PyQt program to produce any sound. I am able to get sound correctly from the Pi over HDMI using speaker-test and paplay, so I am happy ...
- 210
0
votes
1
answer
2k
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install qtcreator kit on raspberry pi 4b - 64 bit
I've tries sudo apt install qtcreator and menu / preferences / add/remove software - search qtcreator, check qtcreator, apply
both seem to install qtcreator ok. But it can't find any qt kit.
which ...
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0
votes
1
answer
144
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/opt/cmake/bin/cmake no file in the directory
I am installing Qt6 using this guide
https://www.tal.org/tutorials/building-qt-62-raspberry-pi
and i am stuck in the Configure the Qt 6.2 build portion where it asks me to execute this line
/opt/cmake/...
- 46
14
votes
5
answers
66k
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PyQt5 on a Raspberry Pi
I have a Raspberry Pi 3 with Raspbian installed, along with a 7" touch screen. I'm in the process of creating an application in Python to read several DS18B20 Thermocouples to monitor the temperature ...
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2
votes
2
answers
4k
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How to get qt4 runtime libraries
The latest (stretch) image has dropped all qt4 libraries and has qt5 libraries instead.
But I still have A LOT of qt4 software. I have searched the web but every hit tells me how to install the qt4 ...
1
vote
1
answer
692
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qtcreator desktop kit is greyed out
Its been quite a while since my last raspberry pi project. I went ahead and bought a new Rpi 4B and installed a fresh Raspbian OS on it and installed qt the way i remember it
$ sudo apt-get install ...
- 77
1
vote
1
answer
7k
views
Touchscreen with Qt QML eglfs
The goal is to run QtQuick2 Qt5 applications on the RPI 2B with USB+HDMI resistive touchscreen (7" 800x480 AR1100 http://www.adafruit.com/products/2407).
Current state
Visual part is fine. Touch ...
CommunityBot
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0
votes
0
answers
303
views
can we send data or files via wifi from a Raspberry PI using a QT graphical interface to another pc under Windows?
so my Raspberry card is connected to a screen by HDMI, I want to develop an interface using the QT platform under linux to give the order to my Rpi card to send data or files and even to receive ...
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1
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1
answer
1k
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symbol lookup error: undefined symbol: _ZN7QWidget8qwsEventEP8QWSEvent
I have cross-compiled executable file from QT 4.8.7. I am running it on a Raspberry PI (Ubuntu), with QT 4.8.7 and QT declarative module installed. When i run the executable file on my raspberry pi, i ...
CommunityBot
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1
vote
1
answer
440
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cross compile Qt 5.7 for rpi3 : help needed
i am trying to cross compile QT 5.7 for rpi 3 and following following links for the same:
https://www.ics.com/blog/configuring-qt-creator-raspberry-pi
https://wiki.qt.io/RaspberryPi2EGLFS
on ...
CommunityBot
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0
votes
2
answers
585
views
Pyqt QCameraInfo.availableCameras() is empty
I'm doing a small project on Raspberry Pi 4. Also, I want to use QtMultimedia to list all cameras on pi, But it returns an empty list.
# This is my testing code
from PyQt5.QtMultimedia import ...
- 13
1
vote
2
answers
809
views
Socketcan and Qt on raspberry pi
Is there a prebuild serialbus library for Raspberry Pi? I would to use
QtCanBus in a project.
Unfortunately I cannot find any reference for installing the necessary library.
tried
sudo apt-get ...
- 1
0
votes
0
answers
274
views
Run QT5 app (chiaki remote play) on raspberry OS lite
I would like to run Chiaki (Playstation Remote Play https://github.com/Fredrum/chiaki) on my raspberrypi zero WH running raspberrypiOS lite (so no GUI).
running chiaki itself on a raspberry pi(zero ...
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-1
votes
1
answer
292
views
How to use at the same time 2 hardware pwm in wiringpi
I need help to configure 2 hardware PWM channels. I am developing device, and sometimes I will need active 2 PWM channels with different frequencies (frequencies is low: 410 and 580 Hz).I'm writing ...
CommunityBot
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-1
votes
1
answer
960
views
QT build error: "WARNING: TARGET is empty" and "make: nothing to be done for "first""
I recently installed qt5 on Raspbian. I'm trying to compile this package so I ranqmake && make. I get these errors:
WARNING: TARGET is empty
make: nothing to be done for 'first'
Before ...
CommunityBot
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0
votes
2
answers
4k
views
installing qt on raspberry pi 4
I'm installing Qt to my raspberry pi-4 for image processing project. I use the commands:
sudo apt update
uname -a
apt-cache search qt5
apt-cache show qt5-default
apt-cache search qtcreator
apt-cache ...
- 58.5k
1
vote
0
answers
300
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QT Creator - Raspberry Pi - 3.5" TFT - Could not initialize egl display
Please forgive my ignorance but I'm new to Raspberry Pi/Linux.
I'm trying to make a touch screen app for the Pi using a 3.5" touch screen (xpt2046) and QT Creator (5.12.5).
QT Creator is running ...
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2
votes
1
answer
2k
views
autostart application on raspberry pi 4 (systemd)
I am working with raspberry pi os lite on raspberry pi 4.
I wanted to autostart a Qt application.
I created under /etc/systemd/system a .service file named application_one.service
this is what the ....
- 27.7k
1
vote
1
answer
127
views
Qt Quick cross compiled application didn't show images on raspberry pi 4
I cross compiled Qt5.14.2 for my raspberry pi 4 on a raspberry pi OS lite
after that I created a Qt Quick application on my Ubuntu and I integrated images in my qml file
Image {
id: compteur
...
- 357
0
votes
1
answer
1k
views
Cross compiling QT 5.14 for raspberry pi 4 [ Could not queue DRM page flip on screen HDMI (invalid argument) ]
I have cross-compiled Qt 5.14 on raspberry pi 4 using ubuntu 18.04
I just followed al the steps of this tutoriel https://www.youtube.com/watch?v=TmtN3Rmx9Rk&t=2538s
the code is just right here ...
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1
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0
answers
199
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pi4 crashes when running any QT apps like RPi imager, VLC, OBS
when opening for example VLC in stock rpiOS the window that asks for metadata network access opens, but its so large that the text in the menu bar takes almost all of my screen and after some time my ...
- 31
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1
answer
47
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Updating text file with sensor datas from three different threads
I am getting values from three different sensors connected to Raspberry Pi. I am using a ADC grove to get those data's. I am updating these sensor data with date and time in a text file. The problem ...
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2
answers
5k
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Compile and run Qt5 webengine on rpi2/3
I have followed the tuto here : https://wiki.qt.io/RaspberryPi2EGLFS
to cross-compile Qt 5.6 for my pi 2. But I did not used the git repo, I have downloaded the source tarball.
I checked by running ...
CommunityBot
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0
votes
1
answer
7k
views
Run Qt Application on Raspberry Pi 3
I'm very new to Qt. I want to start developing GUI Qt application in C++ on raspberry pi. I want to start this application in Kiosk mode on boot. I manage to do it, but I encounter the following ...
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3
answers
1k
views
Configure Raspberry pi to run my application before GUI Desktop
I have created an application through Python that has library dependencies on Qt4, pyqt4, pyqtgraph etc. This application is based on Raspberry Pi, I have developed and finished it on the platform.
I ...
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2
votes
0
answers
2k
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Why GLX or EGL is not enabled when running QT program?
To start with I have to say I was trying to make cross-compilation work for Ubuntu with Raspberry Pi 3+ B. I used this tutorial https://wiki.qt.io/RaspberryPi2EGLFS and QT in version 5.12.4. Tried it ...
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1
vote
0
answers
37
views
Horizontal lines on qt 5.13 app . Problem doesn't present with virtual screen (chvt) manipulation
I have a full-screen app in kiosk mode that runs on qt 5.13.2 (Qt compiled from source). Up until 1 week ago, it displayed just fine. Then, I did an apt dist-upgrade and I now get horizontal lines ...
- 609
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vote
1
answer
571
views
Raspbian or Raspbian Lite for Cross Compiling Qt
I try to follow this guide https://wiki.qt.io/RaspberryPi2EGLFS for cross-compiling Qt. The instructions don't specify whether I need to use the Desktop version or whether also the lite version would ...
CommunityBot
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1
vote
1
answer
788
views
Failure to build QT5 5.12.3 on Raspberry Pi zero
Following the instructions in https://www.tal.org/tutorials/building-qt-512-raspberry-pi,:
wget http://download.qt.io/official_releases/qt/5.12/5.12.3/single/qt-everywhere-src-5.12.3.tar.xz
tar xf qt-...
- 206
2
votes
1
answer
2k
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Cross compiling Qt on windows for raspberry pi, missing xcb dependencies
I am trying to start with Qt for Raspberry Pi on a Windows Dev System. To begin with to setup the environment, I followed the below as per the official wiki page.
From starting at various stages, I ...
CommunityBot
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2
votes
0
answers
281
views
OpenCV cross-compilation fails
I have cross-compiled Qt on my CentOS host for my Raspberry Pi and now I want to cross-compile OpenCV with the following script:
CORES=4
IP=192.168.178.52
TEMP_PATH=/home/kampi/OpenCV
SYSROOT_PATH=/...
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0
votes
0
answers
4k
views
Could not initialize egl display
I have a CentOS host which should be used to develop Qt applications (version 5.12.8) for a Raspberry Pi. I use the following Raspberry Pi setup:
$ cat /proc/cpuinfo
...
model name : ARMv7 ...
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