...
 else if(state==REQUESTTOKEN) {
            state = GOTTOKEN;
            int endValue = strReply.indexOf("&",0);
            int startValue = strReply.indexOf("=",0);
            token = new QString(strReply.mid(startValue+1,endValue-startValue-1));
            QString *username = new QString(strReply.mid(strReply.lastIndexOf("=")+1));
            qDebug() << "username: " << *username;
        //you can extract the username too from this url
            saveSettings(); //save on the app data directory the token.
        }

...