linker error when the class is added in main.cpp

[bts-007]

I took an example program from Qt for qquickview. I am getting an error(undefined reference to 'vtable for ApplicationData', collect2 ld returned 1 exit status) when I add the class in main.cpp. Here is the code

#include<QQuickView>
#include<QGuiApplication>
#include<QObject>
#include<QQmlContext>
#include<QDateTime>
//#include"applicationdata.h"
 
class ApplicationData : public QObject
{
    Q_OBJECT
public:
    Q_INVOKABLE QDateTime getCurrentDateTime() const {
        return QDateTime::currentDateTime();
    }
};
 
 
int main(int argc, char *argv[]) {
    QGuiApplication app(argc, argv);
 
    QQuickView view;
 
    ApplicationData data;
    view.rootContext()->setContextProperty("applicationData", &data);
 
    view.setSource(QUrl::fromLocalFile("MyItem.qml"));
    view.show();
 
    return app.exec();
}

#include<QQuickView>
#include<QGuiApplication>
#include<QObject>
#include<QQmlContext>
#include<QDateTime>
//#include"applicationdata.h"

class ApplicationData : public QObject
{
    Q_OBJECT
public:
    Q_INVOKABLE QDateTime getCurrentDateTime() const {
        return QDateTime::currentDateTime();
    }
};


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

    QQuickView view;

    ApplicationData data;
    view.rootContext()->setContextProperty("applicationData", &data);

    view.setSource(QUrl::fromLocalFile("MyItem.qml"));
    view.show();

    return app.exec();
}

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I took the class and placed in applicationdata.h. I didn't get error and the output was perfect. what is the reason I can't understand.

[anda_skoa]

A cpp file is not automatically processed for Q_OBJECT, headers are.

You can fix that by doing something like

#include "main.moc"

#include "main.moc"

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at the end of main.cpp and re-running qmake

Cheers,
_

[bts-007]

anda_skoa that solved the problem. I added this line in pro file

INCLUDEPATH += tmp/moc/release_shared

INCLUDEPATH += tmp/moc/release_shared

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what is the nedd for it