Signal And Slot Qt C

Hello,

QML Signal and Handler Event System QML utilizes Qt's meta-object and signals systems. Signals and slots created using Qt in C are inheritely valid in QML. Signals and slots are used for communication between objects. Signal/slot mechanism is a central feature of Qt and probably the part that differs most from other toolkits. In GUI programming we often want a change in one widget to be notified. The Signal/Slot Editor. The signal and slot used in a connection can be changed after it has been set up. When a connection is configured, it becomes visible in Qt Designer's signal and slot editor where it can be further edited. You can also edit signal/slot connections by double-clicking on the connection path or one of its labels to display.

I want to execute a method in c++ by clicking a button in a qml interface by sending a signal in the qml file and receiving it in the c++ file.

But when I cklick the button the program doesn't execute the method. I don't know where the error is. Maybe someone of you will find the error or could give me a hint?

Thank you for all answers!

Here is my code so far:

main.qml
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import QtQuick 2.0

Rectangle {
id: main
width: 500
height: 300

}
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main.cpp
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#include <QtGui/QGuiApplication>
#include 'qtquick2applicationviewer.h'
#include <QQuickItem>
#include <QObject>
#include <QString>
#include <QStringList>
#include <QFile>
#include <QProcess>
#include <iostream>
#include <QDebug>
#include <string>

using namespace std;

class Dialog : public QObject
{
Q_OBJECT

public slots:
//create slot...
void trigger_slot(const QString &msg)
{
cout << 'Trigger received' << endl;
qDebug() << 'Trigger received with number ' << msg;
}

};

int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);

}

Qt Signal Slot Performance

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