How to go about saving?

[TomJoad]

I have made a simple interest calculator that takes into account payments made (up to 108). This means that I have 108 payment boxes, and 108 date edits.

I now want to save that information. What would be the best way to go about it? I thought about using Session Management (http://doc.trolltech.com/latest/session.html), but that doesn't appear to be the right answer. The most obvious way to do it would be to take the array information and have it stored as a csv and then have that csv parsed back in when the user wants to load. However, that would require me writing 200+ if statements (unless there is some way to write a for statement that would also change the numbering of the spinboxes and date edits).

Are there any other ways to go about solving this problem?

[JohannesMunk]

You have manually created 108 spinboxes and date edits?

You would have been much better off to declare them in a QList in the first place. Then you can easily iterate through them.

class MainWindow : public QMainWindow
{
public:
   MainWindow() {
      QGridLayout* gl = new QGridLayout();
      for (int i = 0;i < 108;++i)
      {
          QSpinBox* sb = new QSpinBox()
          payments_sb.append(sb);
          gl.addWidget(de,i,0);
 
          QDateEdit* de = new QDateEdit();
          dueDates_de.append(de);
          gl.addWidget(de,i,1);
      }
      QWidget* w = new QWidget();
      w.setLayout(gl);
      setCentralWidget(w);
   }
   void writeToStream(QDataStream& ds)
   {
       ds << payments_sb.length();
       for (int i=0;i<payments_sb.length();++i)
       {
            ds << payments_sb.at(i).value() << dueDates_de.at(i) ... ;
       }
   }
private:
  QList<QSpinBox* > payments_sb;
  QList<QDateEdit* > dueDates_de;
}
 
..

class MainWindow : public QMainWindow
{
public:
   MainWindow() {
      QGridLayout* gl = new QGridLayout();
      for (int i = 0;i < 108;++i)
      {
          QSpinBox* sb = new QSpinBox()
          payments_sb.append(sb);
          gl.addWidget(de,i,0);

          QDateEdit* de = new QDateEdit();
          dueDates_de.append(de);
          gl.addWidget(de,i,1);
      }
      QWidget* w = new QWidget();
      w.setLayout(gl);
      setCentralWidget(w);
   }
   void writeToStream(QDataStream& ds)
   {
       ds << payments_sb.length();
       for (int i=0;i<payments_sb.length();++i)
       {
            ds << payments_sb.at(i).value() << dueDates_de.at(i) ... ;
       }
   }
private:
  QList<QSpinBox* > payments_sb;
  QList<QDateEdit* > dueDates_de;
}

..

To copy to clipboard, switch view to plain text mode 

Or use a QTableWidget or View with custom delegates for your datatypes.

Joh

[TomJoad]

Yes, I manually created them using QT Designer. They all go dateEdit_1, dateEdit_2, etc. Is there a way to cycle through them? If not, looks like some crying is in order as I will either have to do it manually, or just rework the program using QList (or some other solution).

(fuck it, I may just write a for statement that will output the needed code to a text document and then copy that into the source...)

[JohannesMunk]

Ok if you insist you can loop through the children of your mainwidget! But thats not really good design! But definitely better than hard coding!

int i = 1;
QDateEdit *de;
do
{
   de = parentWidget->findChild<QDateEdit *>(QString("dateEdit_%1").arg(i));
   if (de) {
      ...
   }
   ++i;
} while (de);

int i = 1;
QDateEdit *de;
do
{
   de = parentWidget->findChild<QDateEdit *>(QString("dateEdit_%1").arg(i));
   if (de) {
      ...
   }
   ++i;
} while (de);

To copy to clipboard, switch view to plain text mode 

Joh