Hi Alan
let's do a small change in qt_example. cpp to make it more orthodox.
QApplication a( argc, argv );
PlotWindow win ( Argc, Argv );
win.show();
when I do this the program always crashes on close in my system.
much likely because there is an attempt to free twice a memory block.
It may result from
setAttribute( Qt::WA_DeleteOnClose );
on qt_Plotwindow.cpp as at destructor level qt may try to free something
that the driver has already free.
the fact is if I erase or comment that line the program does not crash
anymore on exit.
cheers,
p.s
I will have a look at your commit and test it on my own applications
On Sun, Dec 30, 2018 at 9:58 PM Alan W. Irwin
wrote:
> Hi António:
>
> I have just pushed your change and my subsequent followup to make the
> initQtApp and close QtApp code easier to read and more robust.
>
> Please look carefully at the code changes in my last commit
> (plplot-5.14.0-15-g790754f35) and also test those changes to make sure
> they work fine for your use case (qt applications using qt devices).
>
> Unless you find something that needs changing with that last commit,
> that should complete our joint qt development work until you have
> a chance to work on PLplot again in a couple of months.
>
> However, ideally it would be good to not have to wait that long for
> the resolution of the occasional segfaults on exit for qt_example that
> I encountered when comprehensive testing 5.14.0. So now that I
> understand our qt device driver and binding a bit better, I am going
> to look at that issue again. And if I can find a simple fix, I will
> commit that, but if I still cannot find such a simple fix (as happened
> during the 5.14.0 release because I am still in the early stages of
> learning C++ and Qt), I will leave that (more complex?) fix to you in
> a couple of months.
>
> Alan
> __
> Alan W. Irwin
>
> Programming affiliations with the FreeEOS equation-of-state
> implementation for stellar interiors (freeeos.sf.net); the Time
> Ephemerides project (timeephem.sf.net); PLplot scientific plotting
> software package (plplot.sf.net); the libLASi project
> (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
> and the Linux Brochure Project (lbproject.sf.net).
> __
>
> Linux-powered Science
> __
>
--
António Rodrigues Tomé
Universidade da Beira Interior
Instituto D. Luís (lab associado)
email address:
art...@gmail.com
art...@ubi.pt
http://www.researcherid.com/rid/A-5681-2013
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