On 2/21/2013 12:52 PM, Zak wrote:
The following idea helped me with a different glitch that was probably
unrelated to yours, but who knows, it might help you. Try each of the
following:
# Signals and slots example
# From qt_webview_play.py
@Slot(bool) # bool is PySide.QtCore.bool
def my_slot(input_bool):
pass
# The following three lines should be equivalent, but they
# are not always equivalent in practice:
q_widget.connect(q_widget, SIGNAL("toggled(bool)"), my_slot)
q_widget.toggled.connect(my_slot)
q_widget.toggled[bool].connect(my_slot)
I don't know why they are different, but sometimes they are. My bug
arose when I tried to manually disconnect and reconnect signals,
specifically the loadFinished(bool) signal on a QWebView widget.
In my own experience, it is best to always use the first method, with
SIGNAL("toggled(bool)"). I notice that the StackOverflow question you
linked uses the third method. Try switching it up and see if anything
helps.
Thanks for your comments. I think they were helpful, but the bug
reproduction process here got pretty weird as I fiddle with this some
more. I commonly use method 2 to connect signals and slots (I wasn't
aware of method 3, but I think I see it's necessity at times). I
changed the one connection to use method 1 and sure enough I think I
don't get that failure any more.
(and now just a personal tale of woe this has led me down ...) However,
I now see that regardless of signal/slot issues, that if I sit here and
open,close,reopen and repeat continuously I'm sure to get signal/slot
failures and missing attributes and even segfault crashes sometime in
the first 30 open/close iterations. Unfortunately, this widget that I'm
closing and reopening has nested sub-widgets probably 4 layers deep and
many many nuances. It will take a while to decode this, but it
certainly looks like memory corruption. I'm not going to hazard a guess
about where to point a finger at this point aside to say that pure
python pyside shouldn't segfault.
For the record ... I'm on win 7 32 bit; PySide 1.1.2; python 2.7.3; Qt
4.8.2.
Joel
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