General and Desktop

@free online games said in A question about QNetworkReply::deleteLater() usage: Maybe help your question DataReceiver::DataReceiver(QObject *parent) : QObject(parent) { _manager.setAutoDeleteReplies(true); } void DataReceiver::take() { _buffer.clear(); QNetworkRequest request(url); _reply= _manager.get(request); connect(_reply, &QNetworkReply::readyRead, this, &DataReceiver::onReadyRead); connect(_reply, &QNetworkReply::finished, this, &DataReceiver::onFinished); } void DataReceiver::onReadyRead() { _buffer += _reply->readAll(); } void DataReceiver::onFinished() { _reply->deleteLater(); emit somesignal(_buffer); } Thank you so much!

Turns out that last fix didn't fix everything. Still getting the same error, but this time from qobject.h. Can't modify that. inline QObject *parent() const { return d_ptr->parent; }

I made a repro repository here: https://gitlab.com/kaixoo12/QmlSampleRepro

OK, so looking at the hellographs example, it looks like for more than one Series per GraphsView, axisX and axisY have to be defined in the GraphsView, and not in the Series. If anyone from Qt is reading this, can you please, please update the docs in https://doc.qt.io/qt-6/qml-qtgraphs-scatterseries.html which do not describe this correctly. Thanks, Markus

Hi, Can you share a minimal buildable example that reproduce what you get ?

@aabb2137 said in Black screen with QOpenGLWidget while docking: Maybe creating it at the start of the program and then hiding it could be a workaround. //Mainwindow constr auto *dummyGL = new QOpenGLWidget(this); dummyGL->show(); dummyGL->hide(); This solved my flashing problem, but is it correct solution ?

ever figure out a solution?

Hi, That import looks fishy. Do you have your own file named qcombobox ?

@WOLKsite I was having the same issue, found out it was due to the "ON SCREEN CONTROL" app that I installed for my monitor, so you may want to check any software or drivers you may have installled.

@Joe-von-Habsburg thanks for the idea. However, I want to distribute this particular application and I want it to be as independent of other sources as possible. Using openstreet maps was acceptable. Using them plus an aditional server is too much. As mentioned befor, I prefer to draw a map myself using a QGraphicsScene because the map does not have to be very detailed.

Looks like a bug you can report on https://qt-project.atlassian.net

Hi, Without having dived in your source code, I think one key difference to take into account: Python is garbage collected while C++ is not. Also, deleting an object in C++ does not mean that the memory is immediately released to the OS. It may happen at different times depending on your application memory usage pattern, OS etc.

@Christian-Ehrlicher: If " ->" means "and up", that's unusual, and it means 6.11.0 would contain both mingw-builds x86_64-11.2.0-release-posix-seh-rt_v9-rev3 and mingw-builds 13.1.0-202407240918mingw1310. In any case, unless you are saying that one of these contains MinGW 13, I do not see your point.

@Christian-Ehrlicher Got it. Quick sidebar: Let’s be real—MySQL just hasn’t had PostgreSQL’s cultural mindshare these past few years in the tech ecosystem.

@gav451 You can mark it as solved then

@Christian-Ehrlicher said in Getting QSqlError "Driver not loaded": @DiBosco said in Getting QSqlError "Driver not loaded": just the mariadb libs. Even this is not needed - you only need to compile the Qt sql plugin. The rest is already available as binary. Yep, that's all I did. Sounds like I described it poorly. Am still intruiged as to why this has to be done on Windows, but not on Linux (or at least my Linux distro).

You could use QDir::setNameFilters (https://doc.qt.io/qt-6/qdir.html#setNameFilters). The documentation mentions that you can use * and ? wildcards. If you don't know this: ? filters exactly one character. So, to filter for a specific length, just use that number of question marks as name filter.

There is a reason why you can't just run anything with root privileges. And under normal circumstance you should not try to circumvent it. The most important question is if you really need to run something as root (while your own software is not started with root privileges). Qt does not provide anything special to run a process as root. You need to use OS functionality to run an elevated process (you can use QProcess to start sudo or use any of the other methods mentioned before). In the case of sudo it is up to you to ask the user for the password and hand it to sudo. But, even this is a bad idea because it is really easy to leak the password for an attacker.