General and Desktop

@Alain38 what you mean is override "QVariant myComputer(int role)" ? if so, what should return using QDir::drives()?

@Christian-Ehrlicher What do you mean really make sure? I call it inside the constructor of classes of my static libraries (if the class uses resources). In my GUI application I call it in main after the application class (QApplication in this case) is created and before the main window is created.

Solved by this: connect(m_pUdpSocket, &QUdpSocket::bytesWritten, this, &QUdpClient::Slot_RefillSocketBuffer);

@SGaist yes it worked fine I adapted the command windeployQt to cmake file. thanks for the help

Thanks @Chris-Kawa. It Works as expect.

Designer doesn't have that functionality. Promoting is only implemented for widgets.

Then you can simply store the image path as class member variable and reuse it in the slot that will do the OpenCV processing.

@Aeroplane123 Then do so! QByteArray::mid(2).

@Hayri Then use the QLineEdit::setValidator().

@masa4 If it helps, you are welcome to use a local variable in a method to reference a database, just that you should not keep it around in a class member variable. You might have code looking like this (only a suggestion): DB::DB(const QString &path) { QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE"); db.setDatabaseName(path); if (!db.open()) qDebug() << db.lastError().text(); } DB::~DB() { bool valid = false; QString connectionName = ""; { // the need for these enclosing parentheses for scope is explained at https://doc.qt.io/qt-6/qsqldatabase.html#removeDatabase // only because I am going to call `removeDatabase()` here QSqlDatabase db = QSqlDatabase::database(); valid = db.isValid(); if (valid) { connectionName = db.connectionName(); if (db.isOpen()) db.close(); } } if (valid && !connectionName.isEmpty()) QSqlDatabase::removeDatabase(connectionName); }

The widget that was preventing further propagation of QEvent::PaletteChange events had a custom palette set. Removing that fixed the issue. @Chris-Kawa Thanks for pointing me in the right direction!

@Lotfi I really fail to understand what you're asking. Can you please explain better?

@Nan-Feng Sorry, but I'm not your employee and don't have to take initiative. I'm not payed for helping others here. I'm doing it in my own private time. If you want better support you will have to pay QtCompany as commercial user.

@Zoii said in Get executable file in QT Design studio: So why should we use Qt design studio if we need Qt creator in order to create a file .exe? Is it better to create everything directly in Qt creator ? A larger team might have a dedicated UI designer and a dedicated software engineer (or even multiple of each). The UI designer would use Qt Design Studio, and the software engineer would use Qt Creator.

@Damian7546 said in Exchange data beetwen two machines with qt app: Even just one client with too many queries can crash my application ? Crash? I guess you mean that too many requests could block your event loop? To answer this question you should actually first do benchmarking and only introduce threads if you really have to.

This turned out to be a bug in Qt 5.12.4 and was fixed on upgrading to 5.15.

@dachui If you want to ask the OP in the linked thread then please post in that thread instead of openning a new thread.