How to set QDate more than once ?

sonichy

When I set QDate1 = QDate2 more then once, it will cause program crash !

mrjj

Hi
That sounds odd.
Unless QDate1 and QDate2 are pointers, then it seems almost impossible.

Can you show the actual code ?

sonichy

@mrjj When I have not click the cell of QTableWidget, and press next mouth, the currentCellChanged(cr=-1, cc=-1) cause error.

connect(ui->pushButton_nextmonth,SIGNAL(released()),this,SLOT(nextMonth()));
connect(ui->tableWidget,SIGNAL(currentCellChanged(int,int,int,int)),this,SLOT(currentCellChanged(int,int,int,int)));

void MainWindow::nextMonth()
{
    date_selected = date_selected.addDays(30);  
}

void MainWindow::currentCellChanged(int cr, int cc, int pr, int pc)
{
    Q_UNUSED(pr);
    Q_UNUSED(pc);
    qDebug() << cr << cc;   
    CalendarDay *calendarDay = (CalendarDay*)(ui->tableWidget->cellWidget(cr,cc));
    date_selected = calendarDay->date;
    qDebug() << date_selected;   
}
```

SGaist

Hi,

Because you are accessing an invalid cell. And since you are using a C style cast, you are just getting a pointer to an invalid location.

Use qobject_cast when dealing with QObject based classes and check that the returned pointer is not zero.

Also add sanity checks for the index you are getting.