QStandardItemModel setItem crash..

[TheCipo76]

Mac Os X 10.15 - Qt 5.12.3 Clang64 C++ - MySql Database on local network Nas

Hi to all,
i'm working with QStandardItemModel and when i try to insert data in a column my app crash..

I've declared it in .h file

#include <QDialog>
#include <QSqlTableModel>
#include <QMimeData>
#include <QTableView>
#include <QStandardItemModel>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlTableModel>
#include <QSqlQueryModel>


class DragSqlTableModel : public QSqlQueryModel{
    Q_DISABLE_COPY(DragSqlTableModel)

public:
    using  QSqlQueryModel::QSqlQueryModel;
    Qt::ItemFlags flags(const QModelIndex &index) const override {return QSqlQueryModel::flags(index) | Qt::ItemIsDragEnabled;}

};

class OverwriteModel : public QStandardItemModel{
    Q_DISABLE_COPY(OverwriteModel)

public:
    using QStandardItemModel::QStandardItemModel;
    bool dropMimeData(const QMimeData *data, Qt::DropAction,
                         int, int, const QModelIndex &parent)  override
    {
        const QByteArray mimeData = data->data("application/x-qabstractitemmodeldatalist");
            QDataStream mimeReader(mimeData);
            int junk;
            QMap<int,QVariant> modelData;
            for(;;){
                mimeReader.startTransaction();
                mimeReader >> junk >> junk >> modelData;
                if(!mimeReader.commitTransaction())
                    break;
                setItemData(parent,modelData);
            }
        return true;
    }
};

namespace Ui {
class pianificaproduzione;
}

class pianificaproduzione : public QDialog
{
    Q_OBJECT

public:
    explicit pianificaproduzione(QWidget *parent = nullptr, const QString &Utente="", const QString &Password="");
    ~pianificaproduzione();

    QString Utente, Password;
    //OverwriteModel *model;

private slots:
    void UpdateAllWidgets();

    void on_pushButton_30gg_clicked();

    void on_pushButton_45gg_clicked();

    void on_pushButton_60gg_clicked();

private:
    Ui::pianificaproduzione *ui;

    //QSqlTableModel *mModel;
    QSqlDatabase aDatabase;
    QStandardItemModel *EModel, *PModel;
    DragSqlTableModel *source;
    OverwriteModel *model;       // declaration
};

in .cpp file i've initialize it :

OverwriteModel *model = new OverwriteModel(40,6,this);
    //INTESTAZIONE COLONNE
    model->setHorizontalHeaderItem(0, new QStandardItem(QString("MACCHINA")));
    model->setHorizontalHeaderItem(1, new QStandardItem(QString("1")));
    model->setHorizontalHeaderItem(2, new QStandardItem(QString("2")));
    model->setHorizontalHeaderItem(3, new QStandardItem(QString("3")));
    model->setHorizontalHeaderItem(4, new QStandardItem(QString("4")));
    model->setHorizontalHeaderItem(5, new QStandardItem(QString("5")));
    model->setHorizontalHeaderItem(6, new QStandardItem(QString("6")));
    // MACCHINE
    model->setItem(0,0,new QStandardItem(QString("PRESSA T63")));
    model->item(0,0)->setBackground(Qt::lightGray);
    model->setItem(1,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(2,0,new QStandardItem(QString("PRESSA T100")));
    model->item(2,0)->setBackground(Qt::lightGray);
    model->setItem(3,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(4,0,new QStandardItem(QString("PRESSA T160")));
    model->item(4,0)->setBackground(Qt::lightGray);
    model->setItem(5,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(6,0,new QStandardItem(QString("PRESSA T199")));
    model->item(6,0)->setBackground(Qt::lightGray);
    model->setItem(7,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(8,0,new QStandardItem(QString("PRESSA T200")));
    model->item(8,0)->setBackground(Qt::lightGray);
    model->setItem(9,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(10,0,new QStandardItem(QString("PRESSA T201")));
    model->item(10,0)->setBackground(Qt::lightGray);
    model->setItem(11,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(12,0,new QStandardItem(QString("TRAPANI")));
    model->item(12,0)->setBackground(Qt::lightGray);
    model->setItem(13,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(14,0,new QStandardItem(QString("OMERA/PIEGAT")));
    model->item(14,0)->setBackground(Qt::lightGray);
    model->setItem(15,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(16,0,new QStandardItem(QString("CARTATRICE")));
    model->item(16,0)->setBackground(Qt::lightGray);
    model->setItem(17,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(18,0,new QStandardItem(QString("TRONCA/CNC")));
    model->item(18,0)->setBackground(Qt::lightGray);
    model->setItem(19,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(20,0,new QStandardItem(QString("PUNT/MONTA")));
    model->item(20,0)->setBackground(Qt::lightGray);
    model->setItem(21,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(22,0,new QStandardItem(QString("SALDATRICI")));
    model->item(22,0)->setBackground(Qt::lightGray);
    model->setItem(23,0,new QStandardItem(QString("N. PEZZI")));
    model->setItem(24,0,new QStandardItem(QString("ROBOT LUZZARA")));
    model->item(24,0)->setBackground(Qt::lightGray);
    model->setItem(25,0,new QStandardItem(QString("N. PEZZI")));
    for (int i=0; i<26; i++) {
        for (int j=1; j<=6; j++) {
            model->setItem(i,j, new QStandardItem(QString("")));
        }

and all works fine..
now on pushbutton click i have to read from model:

QString Dati = model->data(model->index(0,i)).toString()

return no data

and if i try to write in one specific columns:

QStandardItem *Cod = new QStandardItem(Codice);
model->setItem(0,i, Cod);           //(i=0)

my app crash..

Can you help me to understand why??
Thanks in advance.

[Christian Ehrlicher]

@TheCipo76 said in QStandardItemModel setItem crash..:

OverwriteModel *model = new OverwriteModel(40,6,this);

You create a local variable here...

[TheCipo76]

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