Hello,

i have problem with unmarshaling complex type from QDBusArgument. Method returns a{sa{sv}}. I declared typedef for this complex type:

Qt Code: 
  1. typedef QMap<QString, QMap<QString, QVariant>> ConnectionSettings;
  2. Q_DECLARE_METATYPE(ConnectionSettings)
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And i'm trying to call method:

Qt Code: 
  1. ConnectionSettings NetworkConnection::getSettings()
  2. {
  3.     QDBusInterface iface(m_serviceName, m_objectPath, m_interfaceName,
  4.                          SystemBusConnectionFactory::getInstance());
  5.  
  6.     auto msg = iface.call("GetSettings");
  7.     qDebug() << msg;
  8.     auto retVal = msg.arguments()
  9.             .first()
  10.             .value<QDBusArgument>();
  11.  
  12.     ConnectionSettings cs;
  13.  
  14.     retVal.beginMap();
  15.     while( !retVal.atEnd() ) {
  16.         QString key;
  17.         QVariantMap value;
  18.         retVal.beginMapEntry();
  19.         retVal >> key >> value; //This line crashes!
  20.         retVal.endMapEntry();
  21.         cs.insert(key, value);
  22.         qDebug() << key << value;
  23.     }
  24.     retVal.endMap();
  25.  
  26.     return cs;
  27. }
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Unfortunately there is a segfault - debugger show line 331 in qdbusargument.h:

Qt Code: 
  1. ...
  2. template<typename Key, typename T>
  3. inline const QDBusArgument &operator>>(const QDBusArgument &arg, QMap<Key, T> &map)
  4. {
  5.     arg.beginMap();
  6.     map.clear();
  7.     while (!arg.atEnd()) {
  8.         Key key;
  9.         T value;
  10.         arg.beginMapEntry(); // SIGSEGV here!
  11.         arg >> key >> value;
  12.         map.insertMulti(key, value);
  13.         arg.endMapEntry();
  14.     }
  15.     arg.endMap();
  16.     return arg;
  17. }
  18. ...
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Where should I search for the problem?