maemo.org - Talk - Help with QDBusPendingCall

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Help with QDBusPendingCall

Hi!

I tried to call this method with Qt using QDBusPendingCall, but I always receive an error in the reply.

The message I'm trying to call is this:

Code:

method call sender=:1.50 -> dest=org.freedesktop.Tracker serial=5264 path=/org/freedesktop/Tracker/Metadata; interface=org.freedesktop.Tracker.Metadata; member=GetUniqueValuesWithAggregates

   string "Music"

   array [

      string "Audio:Artist"

   ]

   string ""

   array [

      string "SUM"

      string "COUNT"

      string "COUNT"

      string "CONCAT"

   ]

   array [

      string "Audio:Duration"

      string "Audio:Album"

      string "*"

      string "Audio:Album"

   ]

   boolean false

   int32 0

   int32 10

And this is the reply I should receive:

Code:

method return sender=:1.1317 -> dest=:1.50 reply_serial=5264

   array [

      array [

         string "Affinity"

         string "4307"

         string "1"

         string "15"

         string "Affinity"

      ]

      array [

         string "Alanis Morissette"

         string "3645"

         string "1"

         string "13"

         string "Jagged Little Pill"

      ]

      array [

         string "Al Di Meola"

         string "2312"

         string "1"

         string "6"

         string "Casino"

      ]

      ...

   ]

I tried to use this code, but as I said I always receive an error (reply.isError() is true):

Code:

void MafwHelper::GetCatalog(QString aggregate, int index, int count)

{

#ifdef Q_WS_MAEMO_5

    QDBusConnection conn = QDBusConnection::sessionBus();

    QDBusInterface device("org.freedesktop.Tracker",

                          "/org/freedesktop/Tracker/Metadata", "org.freedesktop.Tracker.Metadata", conn);



    QStringList par1 = QStringList() << aggregate;

    QStringList par2 = QStringList() << "SUM" << "COUNT" << "COUNT" << "CONCAT";

    QStringList par3 = QStringList() << "Audio:Duration" << "Audio:Album" << "*" << "Audio:Album";



    qDebug() << "DBusMessage: GetUniqueValuesWithAggregates";

    QDBusPendingCall pcall = device.asyncCall("GetUniqueValuesWithAggregates",

                                              "Music", par1, "",

                                              par2, par3, false, index, count);

    QDBusPendingCallWatcher *watcher = new QDBusPendingCallWatcher(pcall, this);



    connect(watcher, SIGNAL(finished(QDBusPendingCallWatcher*)),

            this, SLOT(GetCatalogFinishedSlot(QDBusPendingCallWatcher*)));

#endif

}



#ifdef Q_WS_MAEMO_5

void MafwHelper::GetCatalogFinishedSlot(QDBusPendingCallWatcher* call)

{

    QDBusPendingReply<QDBusVariant> reply = *call;

    if (reply.isError()) {

        qWarning() << "QDBusPendingReply error";

    } else {

        for(int i=0; i<reply.count(); i++){

          QVariant val = qvariant_cast<QDBusVariant>(reply.argumentAt(i)).variant();

          qDebug() << val;

        }

    }

    call->deleteLater();

}

#endif

Can someone point me in the right direction? :)
I'm not even sure that a QStringList parameter is correct for the array in dbusmessage...

Many thanks

Re: Help with QDBusPendingCall

Ok, I don't know what I'm doing wrong, but asyncCall doesn't work for me.
callWithCallback works perfectly. ;)

Code:

void MafwHelper::GetCatalog(QString aggregate, int index, int count)

{

#ifdef Q_WS_MAEMO_5

    QDBusInterface device(QLatin1String("org.freedesktop.Tracker"),

                          QLatin1String("/org/freedesktop/Tracker/Metadata"),

                          QLatin1String("org.freedesktop.Tracker.Metadata"),

                          QDBusConnection::sessionBus());



    QStringList par1 = QStringList() << aggregate;

    QStringList par2 = QStringList() << "SUM" << "COUNT" << "COUNT" << "CONCAT";

    QStringList par3 = QStringList() << "Audio:Duration" << "Audio:Album" << "*" << "Audio:Album";



    qDebug() << "DBusMessage: org.freedesktop.Tracker.Metadata::GetUniqueValuesWithAggregates";



    QList<QVariant> args = QList<QVariant>() << "Music" << par1 << "" << par2 << par3 << false << index << count;

    device.callWithCallback(QLatin1String("GetUniqueValuesWithAggregates"), args,

                                          this, SLOT(GetCatalogFinishedSlot(QDBusMessage)));

#endif

}



#ifdef Q_WS_MAEMO_5

void MafwHelper::GetCatalogFinishedSlot(QDBusMessage msg)

{

    QVariant val = msg.arguments()[0];

    QDBusArgument arg = qvariant_cast<QDBusArgument>(val);



    arg.beginArray();

    while (!arg.atEnd()) {

        QList<QString> element;

        arg >> element;

        qDebug() << element;

    }

    arg.endArray();

}

#endif

Re: Help with QDBusPendingCall

You might wanna have a look here https://gitorious.org/qt-mediaplayer...es/master/mafw (if it's only mafw you want to use from tracker).
(MafwSource and MafwRenderer classes were written by nicolai)