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List: pykde
Subject: Re: [PyQt] PyQt. How to shoot yourself in the foot.
From: Andrei Kopats <hlamer () tut ! by>
Date: 2014-08-24 16:10:25
Message-ID: CAMpovgGdmgnbbYOMd0gKqBhT3_YykWYzJRo0fm+Xni06geOFVg () mail ! gmail ! com
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On Sun, Aug 24, 2014 at 5:47 PM, Yuya Nishihara <yuya@tcha.org> wrote:
> I can't tell you why this example raises "C++ object deleted" error. It
> worked
> as expected with old-style connection:
>
> QTimer.singleShot(1000, lineEdit, SLOT('selectAll()'))
>
> But I guess real-world cases of "C++ object deleted" error are caused by
> different reason than this example.
>
Of course I can't be absolutely sure what causes the crashes. But on real
word Enki Editor I had a few situations when application either crashed or
generated RuntimeError. If an exception were generated, a backtrace was
just like in my small example. And after I forced signals disconnection
either crashes and exceptions disappeared.
Yuya, thank you for information about old style signals and slots. I
checked it and found that I don't have any exceptions either on PyQt and
PySide. So I updated the article and mentioned you in the text. I hope you
don't mind.
Andrei
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<div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Aug 24, 2014 at \
5:47 PM, Yuya Nishihara <span dir="ltr"><<a href="mailto:yuya@tcha.org" \
target="_blank">yuya@tcha.org</a>></span> wrote:<br> <blockquote class="gmail_quote" \
style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="">I can't \
tell you why this example raises "C++ object deleted" error. It worked<br></div> as \
expected with old-style connection:<br> <br>
QTimer.singleShot(1000, lineEdit, SLOT('selectAll()'))<br>
<br>
But I guess real-world cases of "C++ object deleted" error are caused by<br>
different reason than this example.<br></blockquote><div><br></div><div>Of course I can't \
be absolutely sure what causes the crashes. But on real word Enki Editor I had a few situations \
when application either crashed or generated RuntimeError. If an exception were generated, a \
backtrace was just like in my small example. And after I forced signals disconnection either \
crashes and exceptions disappeared.</div> <div><br></div><div>Yuya, thank you for information \
about old style signals and slots. I checked it and found that I don't have any exceptions \
either on PyQt and PySide. So I updated the article and mentioned you in the text. I hope you \
don't mind.</div> <div><br></div><div>Andrei</div></div></div></div>
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