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
Qt Code: 
  1. int main(int argc, char* argv[]){
  2.     QApplication app(argc, argv);
  3.  
  4.     MainWindow *dialog = new MainWindow;
  5.  
  6.     return app.exec();
  7. }
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mainwindow.h
Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent) :
  2.     QMainWindow(parent)
  3. {
  4.     setupUi(this);
  5.  
  6.     createActions();
  7.     createTrayIcon();
  8.  
  9.    connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));
  10.  
  11.     trayIcon->show();
  12.  
  13.     showMessage();
  14.  
  15. }
  16.  
  17. void MainWindow::createActions(){
  18.    aboutAction = new QAction(tr("&About"), this);
  19.     connect(aboutAction, SIGNAL(triggered()), this, SLOT(showAbout()));
  20.  
  21.     quitAction = new QAction(tr("&Quit"), this);
  22.     connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
  23. }
  24.  
  25. void MainWindow::createTrayIcon(){
  26.     trayIconMenu = new QMenu(this);
  27.     trayIconMenu->addAction(aboutAction);
  28.     trayIconMenu->addSeparator();
  29.     trayIconMenu->addAction(quitAction);
  30.  
  31.     trayIcon = new QSystemTrayIcon(this);
  32.     trayIcon->setContextMenu(trayIconMenu);
  33. }
  34.  
  35. void MainWindow::showAbout(){
  36.     QMessageBox::about(this, tr("Foo"), tr("Bar"));
  37. }
  38.  
  39. ...
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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