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.
Good luck,
Zak Fallows
On 2/21/13 9:11 AM, Joel B. Mohler wrote:
Does anyone recognize and know a solution for the "Failed to connect
signal" traceback here? I get this runtime error occasionally.
Invalid Signal signature: toggled(bool)
Traceback (most recent call last):
.... stuff ...
RuntimeError: Failed to connect signal toggled(bool).
I don't have any case that is small enough or public enough to post here
in any detail, but I'm sure I'm not the only one who recognizes this on
sight as the dreaded erratic failure-to-connect bug. I have two
different apps which exhibit the issue (different signals). The
question at
http://stackoverflow.com/questions/8881048/getting-erratic-invalid-signal-signature-errors-in-pyside-qwebpage
seems to me to be just as bizarre and surely related to my own conundrums.
Despite all my reluctance to post code, I do have to admit that it is
clear to me that certain signals have it happen and some never do. That
is, I have never seen this error occur for the vast majority of signals
I connect, but there are just a few that it happens on maybe 1 in 20 times.
Any thoughts on this?
Thanks,
Joel
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