[PyQt] Threaded communication

[Jones, Bryan]

Mads,

It depends on your worker thread's code -- is _tasks modifiable at any
time? If so, either approach; if not (I would assume this is the case),
then only by invokeMethod or (perhaps cleaner) via signal/slot connections.

Bryan

On Mon, Feb 16, 2015 at 12:12 PM, Mads Ipsen <mads.ipsen at gmail.com> wrote:

> Hi,
>
> Suppose I have a worker object
>
> class Worker(QObject):
>      ...
>
>      @QtCore.pyqtSlot(object)
>      def addTasks(self, tasks):
>          self._tasks.append(tasks)
>
> which has been moved to a QThread using 'moveToThread', and then started
> from there.
>
> * From the main thread, when I add new tasks to the worker, must I
> always use
>
>    tasks = ['sleep', 'work', 'run']
>    arg = QtCore.Q_ARG(object, tasks)
>    Core.QMetaObject.invokeMethod(self._worker, 'addTasks',
> QtCore.Qt.QueuedConnection, arg)
>
> or can I call this directly, like
>
>    self._worker.addTasks(tasks)
>
> Observe that I pass a pure Python list from the main thread to the
> worker (not a QStringList).
>
> Best regards,
>
> Mads
>
> --
> +---------------------------------------------------------------------+
> | Mads Ipsen                                                          |
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-- 
Bryan A. Jones, Ph.D.
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Department of Electrical and Computer Engineering
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