Handling delayed dbus method

[blacky_i]

Hello everyone!

I am developing dbus api and encontered with this, How to handle delayed dbus call? I have daemon app which is handling dbus requests and share plugin qml extension which is sending dbus method call to daemon app.

I followed this tutorial to create delayed method. After that I request some data from internet. Here is code:

//Creating delayed message
QVariant DBusAdaptor::getChatList(const int offset, const QDBusMessage &message)
{
    m_delayedList.append(RequestData());
    message.setDelayedReply(true);
    m_delayedList.last().reply = message.createReply();
    QDBusConnection::sessionBus().send(m_delayedList.last().reply);
    tdlibJson->getChats(0,
                        std::numeric_limits<std::int64_t>::max(),
                        5,
                        c_extraName);

    return QVariant();
}
//Sending delayed message with data
void DBusAdaptor::sendChatList()
{
    QDBusMessage reply = m_delayedList.last().reply;
    qDebug() << m_chats[0];
    reply << m_chats[0] << m_chats[1];
    QDBusConnection::sessionBus().send(reply);
    m_delayedList.removeLast();
    m_chatIds.clear();
    m_chats.clear();
}

//Filling list with data which will be send over dbus.
void DBusAdaptor::addChatItem(const QJsonObject &chatObject)
{
    if (chatObject.keys().contains("@extra"))
        if (chatObject["@extra"].toString() == c_extraName)
            m_chats.append(chatObject.toVariantMap());
    qDebug() << m_chats.size() << m_chatIds.size();
    if (m_chats.size() == m_chatIds.size())
        emit sendData();
}

In etension plugin I use this code:

    QDBusPendingCall async = remoteAppIface->asyncCall(c_dbusMethod, 0);
    dbusWatcher = new QDBusPendingCallWatcher(async, this);
    connect(dbusWatcher, &QDBusPendingCallWatcher::finished,
    [this](QDBusPendingCallWatcher * call) {
        QDBusPendingReply<QString, QByteArray> reply = *call;
        if (reply.isError())
            qDebug() << reply.error();
        else
            qDebug() << reply.argumentAt<0>();
        call->deleteLater();
    });

And I can't get data from method, all I get is emptyness with error message:

QDBusError("org.freedesktop.DBus.Error.InvalidSignature","Unexpected reply signature: got \"\", expected \"say\"")

I assume that handling delayed methods are different, but can't find any examples. Is there on internet any examples of this? Or There is an error in code?

Thanks in advance

[blacky_i]

I've solved it.

To handle long I did not have to send immediately reply (even though tutorial said that we have to). And delayed reply will be send.

Also in extension, QDBusPendingReply<QString, QByteArray> reply = *call; setting expecting signature to \"say\" and not looking to xml interface.