[SailfishDevel] listening for volume change

[Andrey Kozhevnikov]

You need following: 
https://github.com/CODeRUS/harbour-lgremote-webos/blob/master/qml/main.qml#L58

------ Исходное сообщение ------
От: "jerome levreau" <levreau.jerome at vostoksystem.eu>
Кому: "Sailfish OS Developers" <devel at lists.sailfishos.org>
Отправлено: 26.10.2016 19:58:12
Тема: [SailfishDevel] listening for volume change

>hi everyone,
>
>Here where I'm stuck : In my audio app, for a new functionality I would 
>like to control volume. Now I'm trying to get a response (dbus signal) 
>when user is changing volume with button (physical).
>My app has mpris2 control, I monitoring a read to the volume property 
>(of  org.mpris.MediaPlayer2.Player ) but never a write. I tried to look 
>for a propertiesChanged in org.freedesktop.DBus.Properties, I'm seeing 
>response in playback status, position, metadata, etc.. but never from 
>volume change.
>
>Right now, I'm looking into pulseaudio with com.meego.mainvolume2
>https://wiki.merproject.org/wiki/Nemo/Audio/MainVolume
>I connect to pulse, I read current volume (CurrentStep), I can see it's 
>changing between my tests, but my slot to the StepsUpdated signal never 
>been called.
>
>Here my current code :
>
>//******************************************
>
>QDBusConnection bus = QDBusConnection::sessionBus();
>QDBusMessage call = QDBusMessage::createMethodCall("org.PulseAudio1",
>                                                        
>"/org/pulseaudio/server_lookup1",
>                                                        
>"org.freedesktop.DBus.Properties",
>                                                        "Get" );
>call << "org.PulseAudio.ServerLookup1" << "Address";
>QDBusReply<QDBusVariant> r = bus.call(call);
>
>if (r.isValid()) {
>         pulse = new QDBusConnection(QDBusConnection::connectToPeer(
>                            r.value().variant().toString(), 
>"org.PulseAudio1"));
>
>          //****** this is working ****
>         call = QDBusMessage::createMethodCall("",
>                                               "/com/meego/mainvolume2",
>                                               
>"org.freedesktop.DBus.Properties",
>                                               "Get");
>         call << "com.Meego.MainVolume2" << "CurrentStep";
>         qDebug() << "CurrentStep : " << 
>pulse->call(call).value().variant().toUInt();
>
>//***** connect, but never raise a callback ****
>//***** doing something similar with org.nemomobile.voicecall.VoiceCall 
>and it's working fine
>          pulse->connect("",
>                                    "/com/meego/mainvolume2",
>                                    "com.Meego.MainVolume2",
>                                    "StepsUpdated",
>                                    this, 
>SLOT(StepsUpdated(uint,uint)));
>}
>
>// *** my public slot code, never getting an answer
>void modeNuitService::StepsUpdated(uint StepCount, uint CurrentStep) {
>     qDebug() << "StepsUpdated " << StepCount << " " << CurrentStep;
>}
>
>//******************************************
>
>What do you think ? bad argument, bad method signature  or just bad 
>solution ?
>
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