Problem with QTimer

[hosseinyounesi]

This is what I wrote to make a simple timer.
openSuse 11, Qt 4.5, Qt Creator, Qt GUI App

It doesn't work, I mean when I try to execute it "Hi" doesn't appear on Konsole. I tried to debug it in the constructor of the class, but gdb never goes there.
Thanks for your help

MyObject.h

#include <QtCore/QObject>
#include <QtCore/QTimer>
class MyObject : public QObject
{
Q_OBJECT
public:
    MyObject();
private:
    QTimer *timer;
 
private slots:
    void timerEvent();
};

#include <QtCore/QObject>
#include <QtCore/QTimer>
class MyObject : public QObject
{
Q_OBJECT
public:
    MyObject();
private:
    QTimer *timer;

private slots:
    void timerEvent();
};

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main.cpp

MyObject::MyObject()
{
    timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(timerEvent()));
    timer->setInterval(10);
    timer->start();
}
 
void MyObject::timerEvent()
{
    std::cout << "Hi" << std::endl;
    timer->start();
}
 
int main()
{
    MyObject mo;
    sleep(5);
    return 0;
}

MyObject::MyObject()
{
    timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(timerEvent()));
    timer->setInterval(10);
    timer->start();
}

void MyObject::timerEvent()
{
    std::cout << "Hi" << std::endl;
    timer->start();
}

int main()
{
    MyObject mo;
    sleep(5);
    return 0;
}

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[spirit]

of course it will not work. I don't see where you start event loop.
try this.

...
 
int main(int argc, char **argv)
{
     QCoreApplication app(argc, argv);
     MyObject mo;
     return app.exec();
}

...

int main(int argc, char **argv)
{
     QCoreApplication app(argc, argv);
     MyObject mo;
     return app.exec();
}

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[hosseinyounesi]

Noooooooooooooooooooooooo

Sorry for such a stupid question

[seim]

And if you derive your class A from some other class B, you should call B's constructor in A():

MyObject::MyObject()
   : QObject()
{
....
}

MyObject::MyObject()
   : QObject()
{
....
}

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[bluefly]

And if you derive your class A from some other class B, you should call B's constructor in A():

MyObject::MyObject()
   : QObject()
{
....
}

MyObject::MyObject()
   : QObject()
{
....
}

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actually that happens implicitly. if you want to call a non default base class constructor, you have to say so explicitly using that syntax.