Hello,
So here is my question,
I would like to use QMYSQL on my QtQuick application running on a colibri iMX8X.
I already managed to make it work when running it on my desktop. where I had to build the mysql library from the sources (following this link: https://doc.qt.io/qt-5/sql-driver.html)
Now I would like to know how to buil it easily for my embedded device. Is there a good way to add a custom build step on QtCreator to do it? If so, could someone explain me how I could do it?
Thanks,
Hi Everyone,
I want to develop QT app on RPi4 and I hope I can use the ssh to develop and test my app.
According this guide https://wiki.qt.io/RaspberryPi2EGLFS and the comment on https://code.qt.io/cgit/qt/qtbase.git/tree/mkspecs/devices/linux-rasp-pi4-v3d-g++/qmake.conf?h=5.14.2.
I write the configuration command below,
./configure -release -opengl es2 -device linux-rasp-pi4-v3d-g++ -device-option CROSS_COMPILE=arm-linux-gnueabihf- -sysroot /home/lake/Qt/raspi/sysroot -opensource -confirm-license -make libs -prefix /usr/local/qt5pi -extprefix /home/lake/Qt/raspi/qt5pi -v -no-use-gold-linker
But I cannot link succeed, it always throw the error like the following,
make[3]: Entering directory `/home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative/tools/qmltime'
arm-linux-gnueabihf-g++ -mfloat-abi=hard --sysroot=/home/lake/Qt/raspi/sysroot -Wl,-O1 -Wl,--enable-new-dtags -Wl,-rpath,/usr/local/qt5pi/lib -Wl,-rpath-link,/home/lake/Qt/raspi/sysroot/usr/lib/arm-linux-gnueabihf -Wl,-rpath-link,/home/lake/Qt/raspi/sysroot/lib/arm-linux-gnueabihf -o qmltime .obj/qmltime.o /home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative/lib/libQt5Quick.so /home/lake/Qt/qt-everywhere-src-5.14.1/qtbase/lib/libQt5Gui.so /home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative/lib/libQt5QmlModels.so /home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative/lib/libQt5Qml.so /home/lake/Qt/qt-everywhere-src-5.14.1/qtbase/lib/libQt5Network.so /home/lake/Qt/qt-everywhere-src-5.14.1/qtbase/lib/libQt5Core.so -L/home/lake/Qt/raspi/sysroot/usr/lib/arm-linux-gnueabihf -lGLESv2 -lpthread
/usr/lib/gcc-cross/arm-linux-gnueabihf/9/../../../../arm-linux-gnueabihf/bin/ld: /home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative/lib/libQt5Qml.so: undefined reference to `log2@GLIBC_2.29'
/usr/lib/gcc-cross/arm-linux-gnueabihf/9/../../../../arm-linux-gnueabihf/bin/ld: /home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative/lib/libQt5Qml.so: undefined reference to `pow@GLIBC_2.29'
/usr/lib/gcc-cross/arm-linux-gnueabihf/9/../../../../arm-linux-gnueabihf/bin/ld: /home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative/lib/libQt5Qml.so: undefined reference to `exp@GLIBC_2.29'
/usr/lib/gcc-cross/arm-linux-gnueabihf/9/../../../../arm-linux-gnueabihf/bin/ld: /home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative/lib/libQt5Qml.so: undefined reference to `log@GLIBC_2.29'
collect2: error: ld returned 1 exit status
make[3]: *** [qmltime] Error 1
make[3]: Leaving directory `/home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative/tools/qmltime'
make[2]: *** [sub-qmltime-make_first] Error 2
make[2]: Leaving directory `/home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative/tools'
make[1]: *** [sub-tools-make_first] Error 2
make[1]: Leaving directory `/home/lake/Qt/qt-everywhere-src-5.14.1/qtdeclarative'
make: *** [module-qtdeclarative-make_first] Error 2
It seems QT perbuilt libraries need to use the LIBC 2.29 but Raspberry Pi is only support to 2.28 so far.
Package: libc6
Version: 2.28-10+rpi1
Priority: optional
Section: libs
Source: glibc
Maintainer: GNU Libc Maintainers <debian-glibc@lists.debian.org>
Installed-Size: 9,198 kB
Depends: libgcc1
Recommends: libidn2-0 (>= 2.0.5~)
Suggests: glibc-doc, debconf | debconf-2.0, libc-l10n, locales
Conflicts: openrc (<< 0.27-2~)
Breaks: hurd (<< 1:0.5.git20140203-1), libtirpc1 (<< 0.2.3), locales (<< 2.28), locales-all (<< 2.28), nocache (<< 1.1-1~), nscd (<< 2.28), r-cran-later (<< 0.7.5+dfsg-2)
Could anyone help me or give me some suggestion? This problem is stuck me over 4 day....
Thanks a lot.
Hi everyone,
I have issues in using QSerial port. Actually, I have reading/writting data in my QT project using arduino. I have initialized my serial port in this way:
serialport = new QSerialPort(this);
serialport->setPortName("COM3");
serialport->setBaudRate(QSerialPort::Baud19200);
serialport->setDataBits(QSerialPort::Data8);
serialport->setFlowControl(QSerialPort::NoFlowControl);
serialport->setParity(QSerialPort::NoParity);
serialport->setStopBits(QSerialPort::OneStop);
qDebug()<<"Serial Port Opened"<<serialport->open(QSerialPort::ReadWrite);
After reading/writing data from arduino at desired time, I want to stop it.
I am stopping the serial port by using the command:
serial->close();
When I run my code for the first time, serial port doesn't stop. So, I stop my serial port forcefully through arduino's Serial Monitor. And then when I run my app again, it works alright. It start working perfectly 2nd time and ownwards. What I need to do, in order to close serial port in the first attempt.
Waiting for guidance
TIA,
Hi all,
I have built QT 5.14.1 on linux with -qt-xcb flag in configure and when I try to run my application with these QT libs and plugins, I get following error:
*****qt.qpa.plugin: Could not find the Qt platform plugin "windows" in "plugins/platforms/"
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: eglfs (from plugins/platforms/), linuxfb (from plugins/platforms/), minimal (from plugins/platforms/), minimalegl (from plugins/platforms/), offscreen (from plugins/platforms/), vnc (from plugins/platforms/), webgl (from plugins/platforms/), xcb (from plugins/platforms/), eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, webgl, xcb.**
I have set QT_QPA_PLATFORM_PLUGIN_PATH=plugins/platforms/ and placed this folder where my program is. Also I tried setting QT_DEBUG_PLUGINS=1 and ran, but could not find any error, except at the end which gives error as mentioned above.
Also I ran ldd for exe, qxcb plugin so, and related so and all dependent libs were present in output.
Strange thing is earlier I had built QT 5.13.2 with exact same configuration and same procedure to run the application and I did not get any error.
Please suggest if you have any other thing that can be tried out here. Or is there any issue with my build that you suspect?
Thanks in advance.
Sheetal
How to make a Qt Moc built (New) project to be compatible to run on Custom build approach(old)?
is it possible to make it backward compatible to run on old compilers (VS13 Custom build approach)?
Hi,
I worked with MinGW 64-bits and it works. In order to use the webengine module from QT, I need to compile my application with MSCV. Therefore I installed Visual Studio 2017 (previous version than current) and I also installed QT for MSCV2017-64bits. I tried before to install visualstudio 2019 but it did not work neither.
To test it, I run a simple hello world script and it does not compile. The error is
jom: C:\Users\xxxx...\build-testMSCV-Desktop_Qt_5_14_2_MSVC2017_64bit-Debug\Makefile [debug] Error 2
The process "C:\Qt\Tools\QtCreator\bin\jom.exe" exited with code 2.
Error while building/deploying project testMSCV (kit: Desktop Qt 5.14.2 MSVC2017 64bit)
When executing step "Make"
Here is a screen shot of my kit configuration.
Any idea how I can fix it?
Thanks
Thombou
Hello I have build Qt for WebAssembly manually. Here is what I have done to setup my enviorment:
#Goes to home folder
cd
#Download Emscripten
git clone https://github.com/juj/emsdk.git
cd emsdk
./emsdk install sdk-fastcomp-1.38.30-64bit
./emsdk activate --embedded sdk-fastcomp-1.38.30-64bit
#Goes to home folder
cd
#Create a folder folder for Qt stuff
mkdir Qt
cd Qt
#Download Qt and init-repository
git clone -b 5.14.2 https://code.qt.io/qt/qt5.git
mv qt5 5.14.2
cd 5.14.2
./init-repository -f --module-subset=qtbase,qtdeclarative,qtwebsockets,qtsvg,qtquickcontrols,qtquickcontrols2,qtgraphicaleffects,qtcharts,qtdatavis3d,qtspeech,qtgraphicaleffects
#Create Shadow Build directory
mkdir ~/5.14.2-WebAssembly
cd ~/5.14.2-WebAssembly
#Configure and Build Qt for WebAssembly
source ~/emsdk/emsdk_env.sh
~/Qt/5.14.2/qtbase/configure -opensource -confirm-license -xplatform wasm-emscripten -debug -feature-thread -opensource -nomake examples -nomake tests -prefix ~/Qt/5.14.2-WebAssembly-Debug
make -j$(nproc)
make install -j$(nproc)
#Goes to home folder
cd
# Build a test project
git clone https://github.com/msorvig/qt-webassembly-examples.git
cd qt-webassembly-examples/quick_controls2_gallery
~/Qt/5.14.2-WebAssembly-Debug/bin/qmake #ERROR
make #Never executed because an ERROR happens on the line above
Here is the outuput of qmake:
Project MESSAGE: Setting PTHREAD_POOL_SIZE to 4
Project MESSAGE: Setting TOTAL_MEMORY to 1GB
Project WARNING: This Qt was built with Emscripten version 1.38.30. You have . The difference may cause issues.
Project ERROR: Unknown module(s) in QT: quick quickcontrols2
I tried:
sudo apt install qtquickcontrols2-5-dev
But nothing changed, I still get the error.
I began learning Qt about 3 weeks ago, and I am totally self-taught. I have managed to negotiate Qt Creator, and have developed a fairly (for me) complicated program which works really well! I am using Qt 5.14.1, and the MinGW 64-bit compile kit version 7.3.0, the opensource package. So I am at the point where I want to run this program on another computer, and I understand I need a second version of Qt, compiled for static development. So I found instructions here: https://wiki.qt.io/Building_a_static_Qt_for_Windows_using_MinGW, and I followed them. Unfortunately the compile process ended with errors, and I did not document what they were. But now I have lots of stuff in the \Qt\static folder, and I can't seem to use them. So I am hoping for some advice about what to do next. Should I attempt to reinstall the static version? If so, should I remove the existing static residue first? And if so, how do I do that? I am hoping to get a static version I can employ from Qt Creator. I keep thinking that it should not be s...\o hard to do this. But I am a newbie, and I realize there is lots I don't yet understand which probably would make this process seem more simple. I hope someone can help! One of the problems I encountered is that I could not find a Qt installation file named "qt-everywhere-opensource-src-5.14.1.zip", which the instructions seemed to specify. I did find a file named "qt-everywhere-src-5.14.1.zip" which I used. I'm wondering if this was the right install file to use. I see a note in this forum that "Static linking of Qt requires a license." If this is correct, it explains a lot! In case it is correct, do I have any other options for porting the program to another computer? Thanks in advance.
Enviroment:
QT 5.14.2, MacOSX 10.15.4 Catalina,
build-trytodolist-Desktop_x86_darwin_generic_mach_o_64bit
project.pro:
QT += quick
QT += widgets
CONFIG += c++11
I use SystemTrayIcon:
SystemTrayIcon {
visible: true
icon.source: "media/todo.png"
menu: Menu {
MenuItem {
text: qsTr("Quit")
onTriggered: Qt.quit()
}
}
}
Everything ok in QT debug running mode.
And I deploy the dmg:
~/Qt/5.14.2/clang_64/bin/macdeployqt trytodolist.app -qmldir=/Users/username/Qt/5.14.2/clang_64/qml -dmg
the dmg is generated, but when I run the app, I got:
QQmlApplicationEngine failed to load component
qrc:/main.qml:4:1: module "Qt.labs.platform" is not installed
I check the path: "build-trytodolist-Desktop_x86_darwin_generic_mach_o_64bit-Debug/trytodolist.app/Contents/Resources/qml/Qt/labs"
not find the "platform" subdirectory, but find "calendar" and "settings".
so, how to fix this? or is it a bug a macdeployqt?
Hi.
I want to make the Qt Creator auto-update the ui header file when I change something in the designer.
I remember that it can do it but it isn't in linux.