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Hi,

On Wed, Jan 7, 2015 at 4:11 PM, Ilya Kulakov <kulakov.ilya@gmail.com> wrote:

> I have a python thread that mainly serves a network connection. In this
> thread (due to the logic/architecture of my app) I need connect to a slot
> of QApplication clipboard.
> Something straightforward like connect does not work because my thread
> does not have a Qt event loop. However if I connect with a DirectConnect,
> I'll get my callback called, but sometimes it simply stops to work: no
> events are delivered.
>
> Is there any utility classes in PyQt to subscribe to Qt events from non-Qt
> threads?
>

Delivery of signals to an objects slot when the object lives in another
thread requires a Qt event loop running in that thread, you won't get
around that if you really need a cross-thread signal/slot connection.

However an alternative is to keep the slot in the main thread and use
standard inter-thread communication (Lock/Condition or Queue from python)
to signal whatever you need to communicate to the thread.

Qt and PyQt offer some threading API as well (QThread, QMutex, QSemaphore,
QFuture) but I think you'd have to use QThread for those to work correctly
for your thread (and it sounds like that is also a significant change in
your design).

Andreas

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<div dir=3D"ltr">Hi,<div class=3D"gmail_extra"><br><div class=3D"gmail_quot=
e">On Wed, Jan 7, 2015 at 4:11 PM, Ilya Kulakov <span dir=3D"ltr">&lt;<a hr=
ef=3D"mailto:kulakov.ilya@gmail.com" target=3D"_blank">kulakov.ilya@gmail.c=
om</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"marg=
in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I have a python =
thread that mainly serves a network connection. In this thread (due to the =
logic/architecture of my app) I need connect to a slot of QApplication clip=
board.<br>
Something straightforward like connect does not work because my thread does=
 not have a Qt event loop. However if I connect with a DirectConnect, I&#39=
;ll get my callback called, but sometimes it simply stops to work: no event=
s are delivered.<br>
<br>
Is there any utility classes in PyQt to subscribe to Qt events from non-Qt =
threads?<br></blockquote><div><br></div><div>Delivery of signals to an obje=
cts slot when the object lives in another thread requires a Qt event loop r=
unning in that thread, you won&#39;t get around that if you really need a c=
ross-thread signal/slot connection.</div><div><br></div><div>However an alt=
ernative is to keep the slot in the main thread and use standard inter-thre=
ad communication (Lock/Condition or Queue from python) to signal whatever y=
ou need to communicate to the thread.</div><div><br></div><div>Qt and PyQt =
offer some threading API as well (QThread, QMutex, QSemaphore, QFuture) but=
 I think you&#39;d have to use QThread for those to work correctly for your=
 thread (and it sounds like that is also a significant change in your desig=
n).</div><div><br></div><div>Andreas</div></div></div></div>

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