Invoking a slot in another thread

[dorik]

Hello,

I am trying to use invokeMethod from the main thread on the slot of a QThread subclass which is running an event loop.

QMetaObject::invokeMethod(myThread, "mySlot", Qt::QueuedConnection, Q_ARG(const SomeObject&, obj));

QMetaObject::invokeMethod(myThread, "mySlot", Qt::QueuedConnection, Q_ARG(const SomeObject&, obj));

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However, outputting QThread::currentThreadId() inside the slot shows that it executes in the main thread. Does anyone know what the problem is? I would prefer not to connect a signal to the slot.

Thanks!

[squidge]

You'll probably need to post some of your threading code, but have you tried moveToThread?

[dorik]

You'll probably need to post some of your threading code, but have you tried moveToThread?

How would moveToThread help in this case? Do you mean move the QThread object into its own thread?

[DanH]

Which thread owns the QThread? Likely you created it in the main thread and it's still owned by the main thread, so that's where any slots will be executed.

[dbzhang800]

http://labs.qt.nokia.com/2010/06/17/...oing-it-wrong/

[dorik]

Ah, I understand now. My QThread object lives in the main thread, but I thought signals and slots for the QThread would execute inside it's thread context. Thanks for the link, dbzhang800.