Hi Alan it is easy to put this in a more standard qt way where plot win is not defined as a pointer and put win.show replacing // a.setActiveWindow( win ); // win->setVisible( true ); before the return a.exec()
the fun thing is that in this case the program always crashes when one closes the window. It crashes when the destructor of PlotWindow::~PlotWindow() is called. it crashes there even if you empty the destructor. so I would conclude something very wrong with the extqt driver. I'll promise to have a look, and probably completely replace it by something different as I do not like it, unlike the others that are nice. Unfortunately I have a data workshop in Stockholm in the second week of February and until there I have a huge amount of things to do. cheers, P.s i do Have interactive plplot apps in qt but I always render a png image in a qgraphicsview widget. The png is built by plplot at exactly the same pixels available in the window. and then I have a clock that replots (rebuilding the image whenever the window size changes) I found long time ago that this is much more faster than to have a vector format because the rendering of that format into screen is much more slower than putting plplot producing a new image for the new geometrie window, especially if you don't use hardware acceleration. On Sat, Dec 29, 2018 at 11:30 AM Alan W. Irwin <alan.w.irwin1...@gmail.com> wrote: > On 2018-12-29 09:17-0000 António Rodrigues Tomé wrote: > > > Unfortunately I was not able to make qt-example seg fault in my system > so > > could not found out what was the problem. > > I could only trigger the segfaults in a busy environment, i.e., the > interactive part of comprehensive testing with all sorts of other > interactive tests going at the same time. So I am not surprised you > found it difficult to reproduce this issue. However, if you try a valgrind > run on qt_example, you should find like I did that there is > a memory leak associated with win > because the combination > > QApplication a( argc, argv ); > PlotWindow * win = new PlotWindow( Argc, Argv ); > a.setActiveWindow( win ); > win->setVisible( true ); > [...] > return a.exec(); > > leaves some memory associated with win undeleted. Note, cleanly > deleting win is difficult (or at least I have had no success trying to > do that without creating more segfaults) because of win's use by "a" > above and the necessity (at least according to Qapplication > documentation) that the exec method call be the last thing done in a main > routine. > > Anyhow, if you can find some way to modify the above code so there is > no memory leak associated with win, then that might solve the > intermittent segfault on exit issue shown by qt_example. > > 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 > __________________________ > > > __________________________ > 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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