Questions tagged [qt]
a cross-platform application framework for developing application software
88
questions
0
votes
0answers
6 views
Cmake Configuration for Qt Cross Compilation at Raspberry Zero
I need to cross compile lgvl Demo sample ( Beautiful font package based on C++ )into my Raspberry, SO i selected the Qt Creator which i have successfully cross compiled my others project in QT And C++...
1
vote
1answer
66 views
How do I build Qt's mysql-plugin on Raspbian Buster
I try to build the MySQL plugin on a Raspbian Buster with C++ and Qt 5.12.4. Building Qt itself worked fine by following this tutorial: https://www.tal.org/tutorials/building-qt-512-raspberry-pi
...
0
votes
0answers
12 views
Caputing data from BluetoothLE sensors
I have been trying to grab data from BLE sensors using python.
While the commandline tools worked flawlessly I couldn't get it to work with any other python framwork available for BLE. A collegue ...
0
votes
0answers
46 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-...
0
votes
0answers
13 views
Pi zero USB OTG Connected to Linux OS PC suddenly halt during package getting via internet
I am trying to built native QT into my raspberry Zero via USB OTG connection to my Linux OS PC based of this site instruction.
So when i inserting this codes:
sudo apt-get install build-essential ...
1
vote
0answers
70 views
Qt cross compilation *QOpenGLShaderProgram: could not create shader program* error
I am using the QT Creator for my laptop (Linux LMDE 3 Cindy OS) And for Raspberry Zero Cross-compiling.
I have installed the QT based of this instruction and by this setting:
mkdir ~/raspi
...
0
votes
0answers
31 views
RaspberryPi2EGLFS guide - EGL/GLES libraries fix fail
I built Qt 5.12.3 for Raspberry Pi following the RaspberryPi2EGLFS guide from Qt Wiki.
I was able to reproduce almost each one of the steps described in the guide, but on step 14 (EGL/GLES libraries ...
2
votes
1answer
38 views
Does a binary built on pi 3 will work on pi 2?
I'm building an app on a raspberry pi 3. I'm using Qt. Will the generated binary work on raspberry pi 2?
Thanks
1
vote
1answer
61 views
Raspberry Pi 3 B+ QMediaPlayer - unable to play sound
I'm struggling to play audio files using Qt 5.11.3 and the QMediaPayer class.
There is no sound output when playing either .mp3 or .wav files.
I had some success to play a wav file using QSound class.
...
0
votes
0answers
23 views
The application stalls when the service is loaded at startup
I have RPI3B + with Raspian Stretch on which I run the QT application.
When I create my service to launch the application after starting the rpi i have problems.. The application starts and then the ...
1
vote
0answers
55 views
Raspberry Pi Qt toolchain on Ubuntu 16.04
I have issues creating a tool-chain for cross compiling Raspberry Pi 3 Qt applications through Ubuntu. I used directions from this guide, https://wiki.qt.io/Raspberry_Pi_Beginners_Guide, to help me ...
2
votes
0answers
225 views
Latest Qt5 does not provide EGLFS during cross-compilation
Some time ago I set up a Linux host to cross-compile Qt5. I used this configure command:
./configure -release -opengl es2 -device linux-rasp-pi3-g++ -device-option CROSS_COMPILE=~/opt/tools/arm-...
1
vote
1answer
56 views
Qt Userland raspistill/racpicam integration - Unable to find an X11 visual which matches EGL config
I am developing simple gui app for a client on Raspberry pi running Ubuntu(Mate) 16.04 using Qt 5.5.1 and OpenCV for some face recognition (all C++) using 5MP pi camera.
The framerate/CPU usage ...
1
vote
2answers
65 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 ...
0
votes
0answers
94 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 ...
0
votes
0answers
35 views
Can't install development files for QT on RPi Zero W
I've been following this tutorial trying to get working QT cross-compilation from my PC to a Raspberry Pi Zero W.
It is failing on Step 5 ("Install a bunch of development files").
Running sudo apt-...
1
vote
1answer
800 views
(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, ...
1
vote
1answer
71 views
How to detect if camera is unplugged from CSI bus when it is running?
I am having an issue as below.
I make a Qt application to show video got from the camera module. And when showing video, if the camera is unplugged from CSI bus, I must know that and show a warning ...
1
vote
1answer
880 views
Qt 5.11.1 install: run configure with options
I am new to the whole installing via the console thing.
I try to install Qt 5.11.1 native on my Raspberry Pi 3 with Raspian Stretch according to this tutorial: http://www.tal.org/tutorials/building-qt-...
0
votes
0answers
180 views
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 ...
0
votes
1answer
1k views
Access RPi's camera stream in OpenCV C++ (Qt)
I've setup my Raspberry pi 3 B with uv4l and have access to the video stream on
http://(raspberry-IP):8080/stream address.
Now, I have Qt5(C++) and OpenCV installed on my main computer.
How can I ...
0
votes
1answer
116 views
PyQt5 / eglfs: Draw call returned Cannot allocate memory. Expect corruption
Rather sure this is not a PyQt specific question, but that's the context.
When attempting to start a PyQt5 from CLI/text mode into eglfs, I am met with the following errors:
QOpenGLFramebufferObject:...
0
votes
1answer
567 views
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 ...
1
vote
1answer
232 views
Qt Application crashing on Raspberry Pi 3 with Adafruit 2.8" PiTfT touchscreen
I have a adafruit PiTfT 2.8" 320x240 capacitive touch display running on a raspberry pi. I cross compiled my executable under linux, where I also cross-compiled qt. If I run the enclosed example ...
-1
votes
2answers
2k views
Run Qt Application on Startup [duplicate]
I want to make my qt project run while booting raspberry pi3. When I searched on the web there is a solution for python. Eventhough I put some code on rc.local, this did not solve my problem.
The ...
1
vote
0answers
575 views
Qt5.10.1 Cross-Compiled to Raspberry Pi Zero W uses EGLFS instead of XCB
I have been trying to create a GUI application using Qt5 on Raspbian Stretch, but the application doesn't launch correctly unless I specifically tell it to run as XCB. This is fine, as I don't need it ...
0
votes
1answer
748 views
C++ GUI development with graph support
So, I am developing a project in the RPi where I will be reading values from a sensor using I2C, and this values will be plotted in real time using a GUI. The project is strictly being developed C++ (...
0
votes
1answer
76 views
How can i listen to input in very precise manner of microseconds. Like piscope. Using pigpio socket interface, pigs or liberary
I want to get time and count of input pulse in microseconds using pigpio. How can i Listen to gpio pin in spreate thread.
1
vote
0answers
649 views
PyQt support for WebEngine on Pi
I have installed PyQt5 for Python3 as per the solution here. However while I can import various modules into Python I am finding that none of the WebEngine modules import (WebEngine, WebEngineWidgets, ...
2
votes
1answer
4k views
ImportError: No module named 'PyQt5'
I am trying to get the script here to work on Raspberry Pi. I have tested it on Windows and Ubuntu and it works fine. But getting pyqt5 working on RPi seems to be a challenge. On Ubuntu the following ...
0
votes
0answers
844 views
Qt 5.9 cross-compilation guide for Raspberry Pi
G'day,
I've been attempting to setup a cross-compile workflow for the last week, and have not had any success, despite the numerous guides and how-to's online. My host machine is running 64-bit ...
0
votes
2answers
1k views
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
votes
1answer
31 views
Variables dont get initialized [closed]
i am programming a GUI with Qt5 that uses 4 buttons that turn a stepper motor.
I just took this setup i found on the internet.
Here is my code:
from PyQt5 import QtCore, QtGui, QtWidgets
from time ...
-1
votes
1answer
190 views
How can I move my normal c++ main() function code to qt main function?
I have created small normal c++ code to test in raspberry pi which is working perfectly fine on the terminal.Now I want to write it down in qt, the problem here I am facing is I can able to move my ...
1
vote
2answers
5k views
Jessie: libEGL warning: DRI2: failed to authenticate
I'm developing an application using Python 3 / PyQt5. Everything seems ship-shape until I try to run the GUI (which is partially reliant on a live graph that is backed by pyqtgraph) on my Raspberry Pi ...
1
vote
1answer
741 views
Disable default bluetooth dialog box for accept pairing in raspberry pi3
I am developing a Bluetooth application using Qt5 on Raspberry Pi3. I have implemented my own Pairing agent which will automatically accept the pairing request from the remote device.
The code is ...
0
votes
0answers
844 views
Malfunction with Qt5 and touch screen on RPi3
I develop a Q5 embedded application on RPi3 and I'm having trouble with the touchscreen.
My problem: The touch area is stretched.
In the picture below, the touch area of the buttons at the corners ...
1
vote
0answers
654 views
Problems with PyQt5
Quoting:
I developed a similar application using PyQt4 and Qt4-designer. You
have to install pyqt4 all modules:
sudo apt-get install qt4-default qt4-designer qt4-doc qt4-dev-tools
python-...
1
vote
0answers
167 views
SUID executable doesn't work for `/dev/mem` access
Here is explained how to gain access to the peripheral without being root.
I've just tried in my environment (Raspbian Stretch, RPi2, Qt5.9) in this way:
int main(int argc, char *argv[])
{
...
0
votes
1answer
339 views
Raspian or Raspian 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 ...
1
vote
1answer
2k views
Host errors after cross-compilation of Qt 5.9.2
I've cross-compiled Qt 5.9.2 for Raspbian Stretch with the following setup:
git clone -b 5.9 git://code.qt.io/qt/qt5.git
cd qt5
./init-repository
./configure -release -opengl es2 -device linux-rasp-...
1
vote
0answers
68 views
How to use RF24Mesh on Raspbian in Qt
I want to use the RF24Mesh library in my QT application in Raspbian Jessie.
I can compile the example and run it (with the make command) but when I include libs to my QT app, it gives the error:
...
3
votes
2answers
13k views
Installing Qt on Raspberry Pi 3
I'm trying to install Qt Creator to my Raspberry Pi 3 for a GUI project. However when I use the command
sudo apt-get install qt5-default
it gives an error saying that:
E:Unable to fetch some ...
2
votes
1answer
1k views
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 ...
1
vote
1answer
409 views
Difference between executing script from terminal vs /etc/rc.local
I am booting my raspberry Pi to Terminal at the moment.
I have a script that I would like to run.
The script looks like this run_gui.sh:
python /home/pi/1.py &
/home/pi/Gui&
If I SSH into ...
4
votes
4answers
28k views
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 ...
1
vote
0answers
219 views
Cross compiling QT and example program does not find platform
I followed the follwoing guide to cross-compile QT 5.6 on a Ubuntu 16.04 machine for the raspberrypi2 running jessie:
https://wiki.qt.io/RaspberryPi2EGLFS#A_modern_guide_for_cross-compiling_Qt_5....
2
votes
0answers
2k views
Live Camera App with Qt
I am trying to write an application using Qt that displays live video from the Pi camera. The Qt example projects "camera" (using QWidgets) and "declarative-camera" (using QML) both run without ...
8
votes
2answers
24k views
Qt applications don't work due to libEGL
I am developing some (simple) GUI applications for the RPi2 in Qt5.
The setup:
The code development is performed on a Windows laptop using Netbeans + Qt Designer and remotely built on the RPi running ...
0
votes
1answer
567 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 ...
