I managed to solve it by moving an #include (of the class that has the #include "ExpressionEvaluator/exprtk.hpp" in it) that was in a .cpp file to the .h file and putting it before the #include of the class that has the #include <windows.h> in it. Thanks everyone for the help.

@artem1997262 said in QMYSQL driver not loaded on Ubuntu: Although below shows found that file Where is it located? And did you check whether it is 64bit this time?

i resolved this. Perhaps someone will be useful. I had cmake 3.24-rc4 and they broke something with it. Here is the link: https://gitlab.kitware.com/cmake/cmake/-/issues/23759 Rolled back cmake to 3.23.3, everything works fine @SGaist thk for trying to help

@JonB Shifting it to before any other includes got rid of the error. There were no other details in the error messsage.

@JKSH Yes now It's working Thank you so much!

You have to register the expected Response first! In my case it was like #include <QtDBus/QDBusMetaType> // ... typedef QMap<QString, QMap<QString, QVariant> > ConnectionDetails; Q_DECLARE_METATYPE(ConnectionDetails) and int main() { qDBusRegisterMetaType<ConnectionDetails>(); // ... }

@Aahi On your previous answer, click on the three dots to the right and mark it as the correct answer.

Hi Siddhartha, I am facing a similar issue, have you figured this out? If yes, then could you please help, thanks in advance.

@RekTekk249 said in Tons of error for no obvious reason: Two hours ago, everything was going well, until I realised I needed the same instance of my helper class in my MainWindow than in my LoginWindow. If you would have posted the whole file, esp. showing the parts you've changed, it would have saved a lot of troubleshooting ;-) It's also a debugging thing... If you made changes and suddenly nothing works anymore, revert the changes and try to figure out why it happened.

Thank you to all the panellists, I’ll take care of it. Can we leave it open in case there are any mistakes or questions?

@zeethree50 said in Libicu, needed by Qt5Core, compilation issues. Please help!! Worked fine in 18.04, but not 16.04.: And it worked for me Great, so please don't forget to mark your post as solved!

@rtvideo said in QT configuration issues with IMX6 Board: /usr/bin/distcc/bin/g++-7 Does this exist? Compiler is usually /usr/bin/g++-7

I would start with a clean source (make sure there are no generated files) and build dir

@biaspoint I am pleased you have your situation sorted. Purely OOI, because I like shell scripting, why did you bother to put the xargs into your command when dpkg -l | grep qt | awk '{print $2}' would deliver the same result? :) | xargs -n1 echo is a bit of a no-op?

@hfinger said in How to fix installer file while installing: @sierdzio Do you mean something like /home/.qt5/? (This is Ubuntu.) Or something like /home/myhome/.qt5/? Note sure what you mean by local directory. I am a newbie. I usually install to /home/username/qt.

@aha_1980 said in Project ERROR: Cannot run compiler 'clang++': You usually get *.pro.user.16fe832 files if you copy the project to another machine and open it there without deleting the .pro.user first. ...yes. I suppose that's a missing piece of information. The machine I developed on couldn't properly report to github, so I copied it to a flash drive.

I've solved it. To handle long I did not have to send immediately reply (even though tutorial said that we have to). And delayed reply will be send. Also in extension, QDBusPendingReply<QString, QByteArray> reply = *call; setting expecting signature to \"say\" and not looking to xml interface.

@KillerSmath That solved my problem. Thanks!

When run the above code then it displays "process killed by signal". how to solve it, please help me.

Hello, Sorry, it took me a bit of time to make the tests: A simple "Hello world" project runs correctly in Qt Creator? When using the external lib, the program crashes. I suspect an incompatibility of this old lib with Windows 10. I need to further investigated this issue... Many thanks for your help!

Well, I consider to remove/change the code in my qt app to not depend on qtwebengine... It just displays some wheather maps (images) from an online source. I think I can realize that by fetching those images somehow from that online source and display them on an QLabel or so. I think qtwebengine is quite an overkill for that :)

@SGaist Thanks for the reply. Indeed you are wright. It is very easy actually. I just compiled qt4.8.6 for my system. Then I found the sqlite project in sqldrivers. Compiled this library for my system, copied it and it works! Very easy. Learned again a lot! Thank you all for the great support!

Just case: the latest version of Qt 4 is Qt 4.8.7.

Ok, thanks for the reply. It pointed me in the correct direction and after many failures I finally figured it out. I guess you only learn when you need to dig deep. The only thing I had to do was install the correct version of openSSL. Since it is my first time I had no idea what the letter actually meant, I picked the first build, which was version g, I had to install version n. For all future wanderers, the only thing you need to do to make the client work is one of the two options: Just copy ssleay32.dll and libeay32.dll to working directory OR Install the latest version and set PATH to the folder where the two dlls are located. After that you can use QWebSocket without even knowing SSL exists. Just call: QWebSocket socket; socket.open( QUrl("someaddress") ); And, when the dlls are found the warnings disappear. That's it.

@koahnig You're right, I think I'll go for it. Thx for your time et your help anyway.

@hskoglund thank you so much!!! I import <QVarianList> and it solved my problem.

@Lasith Instead of 100 use ui->tableWidget->rowCount().

Did not work with Firebird 3.0.3 embedded without a running server or firebird.exe -a. It just started to work as a real embedded database and not a tcp based connection when using an empty hostName. Instead of: const QString hostName = "localhost"; just const QString hostName = ""; That helped finally!

@Technologist Which python and mingw version do you use?

Hi! You could install a custom message handler or force your application to die on warnings by defining QT_FATAL_WARNINGS.

@Konstantin-Tokarev For normal web browsing that would be sufficient, yes. In my case we use a web-driven GUI. If I stop the script that needed too long (due to some network error or whatever) the GUI is missing on the device.

These messages aren't critical, you can ignore them. What's important is, that you don't crash the application anymore.

The problem is the same as in your other thread: you need to take care of the destruction order of your qobjects.

Unplugging the tablet does not help. You have to at least temporarily disable the driver. The issue is described in detail here: https://bugreports.qt.io/browse/QTBUG-47548 You can stop the driver like this: net stop WTabletServicePro And restart the driver with this command: net start WTabletServicePro

@p3c0 Thanks a lot.

Oh well, I see http://doc.qt.io/qt-5/qspinbox.html Signals void valueChanged(int i) void valueChanged(const QString &text) <--rtfm! Its now clear to me :)