Questions tagged [qt]

a cross-platform application framework for developing application software

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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++...
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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 ...
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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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
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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. ...
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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 ...
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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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-...
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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, ...
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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 ...
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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-...
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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 ...
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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 ...
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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:...
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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 ...
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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 ...
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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 ...
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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 ...
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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++ (...
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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.
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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-...
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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[]) { ...
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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 ...
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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-...
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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
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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
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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
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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
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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
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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
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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
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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
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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 ...