Exception triggered error while going down in Tableview?

[Mucip]

Hi,
I use Qt 5.13.2 and PostgreSQL12 on windows platform.
I get the sql query and send it as model to tableview. When I push down arrow button continiously I get error and program crush?!

I run it via debugger and there is nothing detailed about error?!...

Regards,
Mucip:)

[Christian Ehrlicher]

Please remove the processEvents() stuff - it's not needed at all. Please also show us the backtrace when it still happens.

[Mucip]

Hi,
I think I found the problem but I son't know the reason?

I use hourglass icon while the view process is working

this->setCursor(Qt::WaitCursor);
QApplication::processEvents();
.
.
//Process
.
.
this->setCursor(Qt::ArrowCursor);
QApplication::processEvents();

When I close these lines than no problem...

Regards,
Mucip:)

[Christian Ehrlicher]

What happens inside this block and why do you call QCoreApplication::processEvents()?

[Mucip]

Hi @Christian-Ehrlicher ,
Some SQL process. I want to show hourglass while retrieving data from PostgreSQL.

Code is below,

modelTableAgac->setQuery("SELECT is_emri_detay.sn, is_emri_detay.stok_kod, stok_kart.stok_ad, "
                             "is_emri_detay.recete_birim, is_emri_detay.recete_miktar, is_emri_detay.aciklama "
                             "FROM is_emri_detay LEFT JOIN stok_kart ON stok_kart.stok_kod = is_emri_detay.stok_kod "
                             "WHERE kaynak_sn = " +
                             index.sibling(index.row(), 0).data().toString() +" ORDER BY is_emri_detay.sn;", baglanti::mdb());

    ui->tVurunAgaci->setModel(modelTableAgac);

    ui->tVurunAgaci->resizeColumnsToContents();
    ui->tVurunAgaci->horizontalHeader()->setSectionResizeMode(5, QHeaderView::Stretch);




    modelTableoperasyon->setQuery("SELECT sn, operasyon_sira_no, tezgah_kod, sure_dk, adam_adet, aciklama "
                                  "FROM is_emri_operasyon WHERE kaynak_sn = " +
                             index.sibling(index.row(), 0).data().toString() +" ORDER BY operasyon_sira_no, sn;", baglanti::mdb());

    ui->tVOperasyon->setModel(modelTableoperasyon);

    ui->tVOperasyon->resizeColumnsToContents();
    ui->tVOperasyon->horizontalHeader()->setSectionResizeMode(5, QHeaderView::Stretch);

By the way I ussed it to inform operating system that pointer has changed.
And now I commented it and tred again. Same error happened...

Regards,
Mucip:)

[Christian Ehrlicher]

Please remove the processEvents() stuff - it's not needed at all. Please also show us the backtrace when it still happens.

[Mucip]

Hi @Christian-Ehrlicher ,
I am so sorry. I have been changing another part of the code. :)

I removed ProcessEvents() and now it's OK... :)

Regards,
Mucip:)

[Mucip]

@Christian-Ehrlicher ,
By the way, what is the problem with ProcessEvents()???

Regards,
Mucip:)

[Christian Ehrlicher]

processEvents spins a new eventloop - this means events in the queue are processed which may interfere with your stuff.