问题
1.) I would like to restart my QT4 application. Just a normal shutdown and start of the same application.
2.) Why? Well i need an Option to "reset" everything. To restart the application seems to be the easiest way to do this. The problem is, that there are a LOT of classes and everything. I dont have the time to put every setting of them back to standard, every textBox, Widget to clear... I Know application restart is not the best way, what do you think is there another way?
Thank You
回答1:
For restarting an application you can use startDetached after quiting the process:
#include <QApplication>
#include <QProcess>
...
// restart the app:
qApp->quit();
QProcess::startDetached(qApp->arguments()[0], qApp->arguments());
回答2:
1) You can run a Script, Schedule the OS to start your app later.
2) Write a separate class which contains all your application Settings. Reset whenever required.
回答3:
Funny request. Just reserve an exit code for "restart" and do something like (untested):
int main(int argc, char **argv)
{
QApplication app(argc, argv);
...
int ret = app.exec();
if (ret == EXIT_RESTART) {
::execve(...);
}
return ret;
}
Then you can just call QApplication::exit(EXIT_RESTART) anywhere and you should be good to go. Or use a wrapper script to do the same. (Make sure in both cases that you handle command line arguments satisfactorily if you app takes any.)
A cleaner approach would be to connect all the things that need to be reset to the same signal.
回答4:
you could delete the classes and create new ones in main() under the same QApplication
回答5:
The sane thing to do in such a case is to put all the stuff that creates/initializes widgets, etc., in a single function (of course, it can call sub-functions). When you need to reset everything, simply call it. Depending on the exact implementation, you may need to delete/un-initialize the stuff first.
回答6:
This method works on PyQt. I wrote it for erasing all settings and to restart the application with clean settings. application_main is the main method, and clearSettings is the slot that clears the settings.
class GuiMain
#Most of implementation missing
def clearSettings(self):
"""Deletes all settings, and restarts the application"""
#TODO: save changes
setting_store = QSettings()
setting_store.clear()
setting_store.sync()
QApplication.exit(GuiMain.restart_code)
restart_code = 1000
@staticmethod
def application_main():
"""
The application's main function.
Create application and main window and run them.
"""
while True:
app = QApplication(sys.argv)
window = GuiMain()
window.show()
ret = app.exec_()
if ret != GuiMain.restart_code:
break
del window
del app
来源：https://stackoverflow.com/questions/5127600/qt4-how-to-restart-application-reset-settings