Qt-interest Archive, September 2007
QFile::size() with closed file. Size does not reflect actual size?
Message 1 in thread
Hi,
according to the QIODevice documentation:
> If the device is closed, the size returned will not reflect the
> actual size of the device.
Is this platform dependent? I experimented here with some code under Linux and
I don't see a difference in the returned size of a file whether it is opened
or not. Or is this only invalid for QFile objects?
Guido
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Message 2 in thread
On 08.09.07 15:16:55, Guido Seifert wrote:
> Hi,
> according to the QIODevice documentation:
>
> > If the device is closed, the size returned will not reflect the
> > actual size of the device.
>
> Is this platform dependent? I experimented here with some code under Linux and
> I don't see a difference in the returned size of a file whether it is opened
> or not. Or is this only invalid for QFile objects?
See QFile::size(), its re-implemented so QIODevice constraints might not
apply. In particular its not a problem to retrieve the file size without
opening it on most systems (as that only involves looking up the size in
the directory node often). Also QFile::size() has a similar limitation
for non-FS files, like stuff in /proc.
Andreas
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