Restart QT application

This short snippets allows you to restart your application.

The first step is to close the application:

qApp->exit(EXIT_CODE_RESTART);

The EXIT_CODE_RESTART is just a constant we use to query that the application needs to be restarted instead of just terminated.

In your main.cpp you need to query the return code from app.exec():

#include <QProcess>

ret = app.exec();           
if (ret == EXIT_CODE_RESTART)
{
    //restart application
    QProcess::startDetached(qApp->arguments()[0], qApp->arguments());
}

The application ends and is restarted.

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