how to run QT application with root permission

Hi

My QT aplication (Qt4) needs root permisions. I'm not sure if I do it right, since I'm new to Linux... and I'm getting an error

Assume my executable is called MyApp I did the following:

chown root:root MyApp
chmod ug+s MyApp

When i tried to run MyApp from my user without root permissions, Instead of being asked to enter password, i got the following:

In one machine i got this waring but the application run..:

This process is currently running setuid or setgid.
GTK+ does not allow this therefore Qt cannot use the GTK+ integration.
Try launching your app using 'gksudo', 'kdesudo' or a similar tool.

in a second machine i got this error and MyApp does not run

GLib-GIO: ERROR:/build/buildd/glib2.0-2.26.0/gio/gdbusconnection.c:2270:initable_init: assertion failed: (connection->initialization_error == NULL)


What am i doing wrong? how should i solve this? Please be noted that my trial MyApp application looks like that:

QApplication a(argc, argv);
Widget w; // inherit from QWidget -this is the basic template that QtCreator creates...with nothing additional
w.show();
return a.exec();

go to terminal and type
sudo ./MyApp

thanks , i thought maybe to gain the permissions programaticaly.. but maybe the simplest way will be enough to my needs..

You can gain the permissions programatically if you want, but I'm not sure if Gnome/KDE use the same authentication methods, and if your not using either it would involve learning PAM.

Therefore, the simplest solution is usually the best.

looks as the simple way is enough for my needs - thanks :-)