maemo.org - Talk - View Single Post - Help with QDBusPendingCall

	sakya	2011-05-26 , 10:40
	Posts: 533 \| Thanked: 1,341 times \| Joined on Dec 2010 @ Italy	#1

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

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Last edited by sakya; 2011-05-26 at 12:28.

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