From kde-devel  Mon Feb 11 15:54:30 2013
From: Philipp Schmidt <philschmidt () gmx ! net>
Date: Mon, 11 Feb 2013 15:54:30 +0000
To: kde-devel
Subject: Problems with Solid in kio-slave (Slots not called, properties not updated)
Message-Id: <3487024.3lIyFvrMsx () sam>
X-MARC-Message: https://marc.info/?l=kde-devel&m=136059824520321

Hi,

I would like my kio_mtp slave to be notified by Solid::DeviceNotifier events. 
However I can't get the Solid::Devicenotifier to work within my helper thread, 
as slots apparently can't be called from slave itself. A QTimer::singleShot() 
works fine. The exact same code, put into a simple QCoreApplication works like 
a charm.

The implementation in the slave constructor is like this:

>>>>>
ExampleClass *ex = new ExampleClass();
helperThread = new QThread( this );
ex->moveToThread(helperThread);
helperThread->start();
<<<<<

In the ExampleClass:

>>>>>
ExampleClass::ExampleClass ( QObject* parent )
{
    QTimer::singleShot(0, this, SLOT(test()));
    
    Solid::DeviceNotifier *notifier = Solid::DeviceNotifier::instance();
    
    connect( notifier, SIGNAL( deviceAdded(QString) ), this, SLOT(test()) );
    connect( notifier, SIGNAL( deviceRemoved(QString) ), this, SLOT(test()) );
}

void ExampleClass::test()
{
    kDebug( 7000 ) << "TestTestTest";
}
<<<<<

The sample project with the code from the top is located at
http://dl.dropbox.com/u/14496907/testslave.tar.gz

Right now I am retrieving the devices using a foreach loop.

>>>>>
foreach ( Solid::Device solidDevice, Solid::Device::listFromType(
        Solid::DeviceInterface::PortableMediaPlayer, QString() ) )
    {
        Solid::GenericInterface *iface =
                solidDevice.as<Solid::GenericInterface>();
        QMap<QString, QVariant> properties = iface->allProperties();
        
        int solidBusNum = 
                properties.value ( QLatin1String ( "BUSNUM" ) ).toInt();
        int solidDevNum = 
                properties.value ( QLatin1String ( "DEVNUM" ) ).toInt();

//...
}
<<<<<

However, there the properties are not updated if the device is unplugged und 
plugged in again (The udi doesn't change, only USB busnum/devnum that LIBMTP 
uses for identification.

So, why is it that Solid won't work in KIO-Slaves like its supposed to?

Cheers,
Philipp

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