> QDBusConnection WalletConnection = QDBusConnection::sessionBus();
thanks, but that's not the problem.
i think i solved it (at least, i hope that's the correct way):
QDBusConnection::sessionBus().connect("org.kde.kwalletd",
"/modules/kwalletd", "org.kde.KWallet", "walletDeleted", this,
SLOT(slotFour()));