Making an application restartable/rebootable
If you have the need to make an application restartable depending on the user interaction you have to follow this steps:
Create an exit code that represents your reboot/restart event
It is a good idea to define this code as a static variable in your main window:
- static int const EXIT_CODE_REBOOT;
and initialize it with a value:
- int const MainWindow::EXIT_CODE_REBOOT = -123456789;
Otherwise you can define a global variable or a constant value.
Define a slot in your application main window that will perform the exit from the application
Define a slot that will exits the application using the reboot code:
- void MainWindow::slotReboot()
- {
- qDebug() << "Performing application reboot..";
- qApp->exit( MainWindow::EXIT_CODE_REBOOT );
- }
Create an action to handle the reboot
Create an action that will consume the above slot in order to exit with the reboot code. Something like the following will work:
- actionReboot->setText( tr("Restart") );
- actionReboot->setStatusTip( tr("Restarts the application") );
- connect( actionReboot,
- SIGNAL(triggered()),
- this,
- SLOT(slotReboot()) );
Modify the application cycle
The last step consists in modifying the application main function to handle the new cycle that will allow reboot:
- int main(int argc, char *argv[])
- {
- int currentExitCode = 0;
- do{
- MainWindow w;
- w.show();
- currentExitCode = a.exec();
- }while( currentExitCode == MainWindow::EXIT_CODE_REBOOT );
- return currentExitCode;
- }
