I have an compilation error "error: redefinition of ‘from_json’" with that code: #include <QVector> #include <QList> #include <QDebug> template<typename OwnType> void from_json(QVector<OwnType> &p) { qDebug() << "QVector"; } template<typename OwnType> void from_json(QList<OwnType> &p) { qDebug() << "QList"; } But i getting that compilation error only in QT6. In QT5 that compilling and working successfully. Whats… Read More QT6 function overloading – QList redefinition of QVector

I am making a QT application. I have a MainWindow1 class and a FirstTab class. The MainWindow1 class is a QMainWindow and inside I created this signal -> mainwindow1.h signals: void loadDateSig(QString strDate); And in FirstTab I created this slot-> FirstTab.h public slots: void loadDate(QString date); Q_Object is defined in both MainWindow1 and in FirstTab.… Read More My QT connect works from parent to child, but not vice versa

how can i close a database connction from Button_onClick funktion? Artikelverwaltung::Artikelverwaltung(QWidget *parent) : QDialog(parent), ui(new Ui::Artikelverwaltung) { … QSqlDatabase db = QSqlDatabase::addDatabase("QODBC"); … } void Artikelverwaltung::on_pushButton_clicked() { db.close(); // <—- This is not working of cause. how can i do this? } Best regards >Solution : It is not working because db is a local… Read More Call db.close() on Button_Click (QT/C++)

I have a ListView filled with checkboxes, I want to change the checkbox status from a button click this is my code. import QtQuick import QtQuick.Controls 2.15 Window { width: 640 height: 480 visible: true title: qsTr("Hello World") ListView { id: mylist width: parent.width height: 300 anchors { top: parent.top left: parent.left right: parent.right bottom:… Read More QML ListView Model setProperty Work only 1 time

I want to known what is new on Qt6. How to migrate my Qt5 project to Qt6. How much work should I do? I will try if it is good enought. >Solution : Here is the chance details you could check it out: What’s New in Qt 6.0 And here is how you can porting… Read More What is new on Qt6,Does it worth to upgrade?

Not sure how to express my question. My snippet code is just to illustrate what I want to achieve in a much bigger code base. I have an "originalCondition" that changes the opacity of an image which is independent of the SequentialAnimation. What I want to achieve after the SequentialAnimation has completed changing the opacity… Read More Switching between original condition and SequentialAnimation

I’m reading this and this doc. But I’m still new to multi-threading and I cannot fully understand these topic. Qt 6.2.0 under Ubuntu 20.04. Basically I have this function: bool Flow::checkNfc() { QByteArray id; QByteArray data; bool ret = _nfc.read(&id, &data, 8); if (ret) { // do something } return ret; } That tries to… Read More Qt6 multi-threading issue