App crashes on model->rowCount()

Panoss

The model is a QSqlTableModel. (declared this way: QSqlTableModel *manufacturers_tbl_model;)
In the clicked slot of a pushbutton, I have this code.

void RepairDevices::on_manufacturers_add_btn_clicked()
{
    int row = manufacturers_tbl_model->rowCount();
}

And when I click the button, the application just...crashes!!!
What am I doing wrong?

jeremy_k

It's hard to tell without more information such as a stack trace or complete example. By any chance is manufacturers_tbl_model uninitialized?

SGaist

Hi,

Is manufacturers_tbl_model pointing to something valid ? i.e. did you do manufacturers_tbl_model = new QSqlTableModel; in the constructor or RepairDevices ?

Panoss

Hi guys.
Yes it is initialised:

QSqlTableModel *manufacturers_tbl_model = new QSqlTableModel;
manufacturers_tbl_model->setTable("manufacturers");
ui.manufacturers_tbl->setModel(manufacturers_tbl_model);
manufacturers_tbl_model->select();

SGaist

No it's not, you're shadowing your member variable.

Panoss

What do you mean SGaist?

Panoss

I replaced:

QSqlTableModel *manufacturers_tbl_model = new QSqlTableModel;

with:

 manufacturers_tbl_model = new QSqlTableModel;

and does not crash anymore!!
Is this what you meant SGaist?

SGaist

Yes, that's what I meant.