segmentation fault in accessing QString->text()

[morta]

hi

I'm coding spreadsheet ... so i am using QTableWidget in my program
I coded a func for saving table's items ...

i have a structure here :

struct cells
{
    int r;
    int c;
    QString text;
};

struct cells
{
    int r;
    int c;
    QString text;
};

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in this func I want to save items
reads items ... copies data into a cells object :

void MainWindow::on_save_clicked()
{
    cells *temp;
    fstream file;
    file.open("test_3.txt",ios::out |ios::binary |ios::trunc);
    if(file)
    {
        for(int i=0;i<ui->tableWidget->columnCount();i++)
            for(int j=0;j<ui->tableWidget->rowCount()-1;j++)
            {
                temp=new cells;
                temp->c=i;
                temp->r=j;
                temp->text.append("ui->tableWidget->item(j,i)->text()");
                file.write(reinterpret_cast<char* >(temp),sizeof(cells));
                delete temp;
            }
        file.close();
    }
    else
        this->close();
 
}

void MainWindow::on_save_clicked()
{
    cells *temp;
    fstream file;
    file.open("test_3.txt",ios::out |ios::binary |ios::trunc);
    if(file)
    {
        for(int i=0;i<ui->tableWidget->columnCount();i++)
            for(int j=0;j<ui->tableWidget->rowCount()-1;j++)
            {
                temp=new cells;
                temp->c=i;
                temp->r=j;
                temp->text.append("ui->tableWidget->item(j,i)->text()");
                file.write(reinterpret_cast<char* >(temp),sizeof(cells));
                delete temp;
            }
        file.close();
    }
    else
        this->close();

}

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my program stops working in this line and when i debug it , it shows me the "segmentation fault" from my OS , this line :

temp->text.append("ui->tableWidget->item(j,i)->text()");

temp->text.append("ui->tableWidget->item(j,i)->text()");

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why ?
what's it's problem with text function of QString class here ?

thanks

[morta]

after testings , i got I have just access to item 0,0 function and when I want to have access to any other item , it stops working ...

why ?

[wysota]

How is your question related to Qwt?