program exit itself when create dialog with QSystemTrayIcon

[jim2212001]

Hi,

I'm using QT creator in WINDOWS7

My program will exit itself when my MainWindow is hidden and I closed the messagebox created by the system tray icon.

main.cpp

int main(int argc, char* argv[]){
    QApplication app(argc, argv);
 
    MainWindow *dialog = new MainWindow;
 
    return app.exec();
}

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

    MainWindow *dialog = new MainWindow;

    return app.exec();
}

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mainwindow.h

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    setupUi(this);
 
    createActions();
    createTrayIcon();
 
   connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));
 
    trayIcon->show();
 
    showMessage();
 
}
 
void MainWindow::createActions(){
   aboutAction = new QAction(tr("&About"), this);
    connect(aboutAction, SIGNAL(triggered()), this, SLOT(showAbout()));
 
    quitAction = new QAction(tr("&Quit"), this);
    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
}
 
void MainWindow::createTrayIcon(){
    trayIconMenu = new QMenu(this);
    trayIconMenu->addAction(aboutAction);
    trayIconMenu->addSeparator();
    trayIconMenu->addAction(quitAction);
 
    trayIcon = new QSystemTrayIcon(this);
    trayIcon->setContextMenu(trayIconMenu);
}
 
void MainWindow::showAbout(){
    QMessageBox::about(this, tr("Foo"), tr("Bar"));
}
 
...

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    setupUi(this);

    createActions();
    createTrayIcon();

   connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));

    trayIcon->show();

    showMessage();

}

void MainWindow::createActions(){
   aboutAction = new QAction(tr("&About"), this);
    connect(aboutAction, SIGNAL(triggered()), this, SLOT(showAbout()));

    quitAction = new QAction(tr("&Quit"), this);
    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
}

void MainWindow::createTrayIcon(){
    trayIconMenu = new QMenu(this);
    trayIconMenu->addAction(aboutAction);
    trayIconMenu->addSeparator();
    trayIconMenu->addAction(quitAction);

    trayIcon = new QSystemTrayIcon(this);
    trayIcon->setContextMenu(trayIconMenu);
}

void MainWindow::showAbout(){
    QMessageBox::about(this, tr("Foo"), tr("Bar"));
}

...

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My program is designed not to have the mainwindow.
Every time I pressed "OK" or "X" on the about dialog, my program exited(with code 0.)

But I want my program to keep running in the background.

Thanks for help,
Jimmy

[wladek]

Hi Jimmy,

Try the following:

int main(int argc, char* argv[]){
    QApplication app(argc, argv);
    QApplication::setQuitOnLastWindowClosed(false);
 
    MainWindow *dialog = new MainWindow;
 
    return app.exec();
}

int main(int argc, char* argv[]){
    QApplication app(argc, argv);
    QApplication::setQuitOnLastWindowClosed(false);

    MainWindow *dialog = new MainWindow;
 
    return app.exec();
}

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[hakermania]

Thanks for this reply, but if you only add this, then your app doesn't exits at all!
You have to add QApplication::setQuitOnLastWindowClosed(1); at the CloseEvent
Anyway thx for the reply, very helpful!