QuaZip/QSaveFile interaction issue

[zaphod.b]

Hi all,

I use QuaZip to process ZIP archives. Eventually I have to write new archives to disc, and make absolutely sure of success before I proceed. As I understand, from Qt 5.1, QSaveFile is intended to accomplish this. This stackoverflow post suggests that QSaveFile indeed implicitly ensures the file is synced to disc.

Now, though I do question some of QSaveFile's design decisions, this post is about pragmatic solutions.

I am looking for a way - with as little effort as possible - to safely write a QuaZip to disc. QuaZip does provide a ctor that takes a QIODevice. However, as the QuaZip::close() docs state:

The underlying QIODevice is also closed, regardless of whether it was set explicitly or not.

QSaveFile not only overrides access to close() as private, but also does this:

/*!
  \reimp
  Cannot be called.
  Call commit() instead.
*/
void QSaveFile::close()
{
    qFatal("QSaveFile::close called");
}

/*!
  \reimp
  Cannot be called.
  Call commit() instead.
*/
void QSaveFile::close()
{
    qFatal("QSaveFile::close called");
}

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which crashes my appplication when QuaZip::close() implicitly calls QIODevice::close() on the QSaveFile.

Any suggestions appreciated.