made QListBox, now how do I save what's in the box to a file?

[twizzle91]

hello,

I've created a QListBox that when you press a button (insert) the text from the QLineEdit is entered into the Listbox. But now i need to make a new button (which i've already done) and have it so when that button is pressed, the contents of the listbox will be saved to a file somewhere.

I guess my major question is where do I start? what Classes should I be looking at to figure out this problem??

thanks!

[wysota]

QFile, I guess.

[twizzle91]

well I've gotten to the point where i can save a .txt file to a location... but it still doesn't save the contents of the listbox :/

[wysota]

but it still doesn't save the contents of the listbox :/

What did you try so far to save the contents?

[twizzle91]

so far i have:

void listBoxx::saveFile()
{
QString filename = QFileDialog::getSaveFileName(this, tr("Save List"), "", tr("Text Files (*.txt);;All Files (*)"));
 
if (filename.isEmpty())
   return;
else {
   QFile file(filename);
   if (!file.open(QIODevice::WriteOnly)) {
      QMessageBox::information(this, tr("cannot open file"), file.errorString());
return;
}
 
QTextStream m_textEdit(&file);
m_textEdit << m_newList;
 
QDataStream stream(&file);
stream << m_newList;
 
file.close();
 
}

void listBoxx::saveFile()
{
QString filename = QFileDialog::getSaveFileName(this, tr("Save List"), "", tr("Text Files (*.txt);;All Files (*)"));

if (filename.isEmpty())
   return;
else {
   QFile file(filename);
   if (!file.open(QIODevice::WriteOnly)) {
      QMessageBox::information(this, tr("cannot open file"), file.errorString());
return;
}

QTextStream m_textEdit(&file);
m_textEdit << m_newList;

QDataStream stream(&file);
stream << m_newList;

file.close();

}

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and i'm able to save a file to a folder, but then when I click the file to open in, it says "file is of an unknown type". and the contents are still not saved to the file either.

[wysota]

What is m_newList? What is "it" that says that file is of an unknown type? Why are you streaming m_newList (whatever it is) to both a text stream and a binary stream? Do you know what you are doing or are you trying things randomly expecting that Qt was written for the sole purpose so that you can write your program so there just has to be a single call that does what you want?

[janorcutt]

QXmlWriter and QXmlReader may be what your looking for. You can then iterate through the QListBox items and write them to an xml file

then you can try the process in reverse...
I would read the documentation on xml and have a look at the examples shipped with creator.