Hello.

I want to use KConfig in a shared library because I want to make use of KDE's KIOSK system, default values etc:

Code: Select all

KConfig kde_cf("kioslaverc", KConfig::NoGlobals);
KConfigGroup kde_settings(&kde_cf, "Proxy Settings");

The problem is that instantiating KConfig produces an error on stdout (or stderr?):

QApplication::qAppName: Please instantiate the QApplication object first

The library may not produce any output. So how can I avoid this output? Some ideas I had didn't work:

Instantiate QApplication is not possible because this would interfer with a possibly created QApplication/KApplication instance that was created by the application that uses the library.

Change the Qt Message handler is also a bad idea because qInstallMsgHandler isn't thread-save and furthermore the change of the message handler could suppress error messages of a thread of the application that uses the library.

So what other possibilities do I have?

You need to ensure that any / all users of your shared library use KApplication / QApplication.

Well, that's exactly what I can not make sure. Some of them will use KApplication/QApplication, some of them no (GTK applications...).

Presence of a QApplication or KApplication instance is required to use KConfig. You will likely need to use GNOME's infrastructure if it has one in the case of it being used in a Gtk application.

You can do this by checking the validity of the qApp pointer.

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if( qApp ) {
 // Use KConfig
} else {
 // Use something else
}

Okay. Thank you.