[code]
QWidget *wid = qobject_cast<QWidget *>(parent());
CSheet *sheet = qobject _cast<CSheet *>(wid->parent());
QScrollArea *scrollArea = qobject _cast<QScrollArea *>(sheet->parent());
CTabWidget *tabWid = qobject _cast<CTabWidget *>(scrollArea->parent());//Here
it is crashing, QSSERT(d) failure
CDataPage *dataPage = qobject _cast<CDataPage *>(tabWid->parent());
MainWindow *mainwin = qobject _cast<MainWindow *>(dataPage->parent());
mainwin->statusBar()->showMessage(tr("A new plot being added!!"),5000);
[/code]
Dear Konstantin
It's not returning anything, it's crashing. When casting to get CTabWidget. For
the sheet's parent is QScrollBar so I am getting that by scrollArea and
scrollArea's parent is CTabWidget.....which is getting failure. What could be
the possible reason, please help.
Kind regards,
Sujan Dasmahapatra
Project Leader, Aero Group
CE - Aero Group
Tel +91 80 66470248
Mob
s...@lmwindpower.com
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-----Original Message-----
From: Konstantin Tokarev [mailto:annu...@yandex.ru]
Sent: Tuesday, April 24, 2012 6:17 PM
To: Sujan Dasmahapatra
Cc: interest@qt-project.org
Subject: Re: [Interest] type casting 5 levels down no error but not proper
24.04.2012, 16:42, "Sujan Dasmahapatra" <s...@lmwindpower.com>:
> Thanks Diego and Konstantin for your valuable inputs. I am now doing
> qobject_cast for all of them, please check the code snippet below, now it’s
> crashing at tabWid step. It’s giving QASSERT failure. The failure is
> happening in the following file
>
> //qscopedpointer.h at the following line QASSERT(d)
>
> inline T *operator->() const
>
> {
>
> Q_ASSERT(d); //this line it’s crashing.
>
> return d;
>
> }
It means that tabWid is QScopedPointer with 0 value. You need to check if
qobject_cast doesn't return 0 before using pointer.
--
Regards,
Konstantin
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