BT on Mac
Thiago Macieira
thiago at macieira.org
Mon Sep 26 15:01:26 PDT 2016
On domingo, 25 de setembro de 2016 12:47:23 PDT Dirk Hohndel wrote:
> So we now have a few reports that this isn’t working anymore…
> I can reproduce things here but have no clue how to fix it.
>
> First I get this error
>
> QObject::connect: Cannot queue arguments of type 'QBluetoothServiceInfo'
> (Make sure 'QBluetoothServiceInfo' is registered using qRegisterMetaType().)
I remember seeing this elsewhere. It might be a Qt bug.
> which appears to be caused by this code in qtserialbluetooth:
>
> #elif defined(Q_OS_ANDROID) || (QT_VERSION >= 0x050500 && defined(Q_OS_MAC))
> // Try to connect to the device using the uuid of the Serial Port Profile
> service QBluetoothAddress remoteDeviceAddress(devaddr);
> serial_port->socket->connectToService(remoteDeviceAddress,
> QBluetoothUuid(QBluetoothUuid::SerialPort));
> timer.start(msec);
> loop.exec();
There's no QBluetoothServiceInfo in there. The only reference in the source
code is
serial_port->socket = new
QBluetoothSocket(QBluetoothServiceInfo::RfcommProtocol);
I don't remember the Bluetooth code implementation anymore (even though I
mentored the student who wrote it). Is the code in qtserialbluetooth.cpp
running in an auxiliary thread, started by libdc?
I've attached a blind attempt at fixing this. I have no idea if it helps in any
way. It may make things even worse.
Can you run with QT_FATAL_WARNINGS=1 and then give me the backtrace of that
QObject::connect warning? (this requires that Qt print no other warnings
before this one) My guess is that this is the emission of the
QBluetoothServiceDiscoveryAgent::serviceDiscovered signal starting at
QBluetoothServiceDiscoveryAgentPrivate::performMinimalServiceDiscovery.
--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
Software Architect - Intel Open Source Technology Center
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