Hi Valeriy,
We provide a system independent file system interface in TSystem.
If you look into this class, you will see that most functions of QDir
are implemented there and also a few more not in QDir. We can more
functionality to this class if there are strong requests.
Rene Brun
Valeriy Onuchin wrote:
>
> "Valeri Fine (Faine)" wrote:
>
> >
> > Hi, Christian
> >
> > What about:
> >
> > http://root.cern.ch/root/htmldoc/TFileSet.html
> >
> > One can iterate it using
> >
> > http://root.cern.ch/root/htmldoc/TDataSetIter.html
> >
> > the way you described.
> >
> > Valeri
> >
> > > Hi ROOT'ers,
> > >
> > > I'd like very much if it would be possible to iterate over a
> > > TSystemDirectory. I imagine one could do
> > >
> > >
> > > TSystemDirectory dir("some directory");
> > > TSystemFile* file = 0;
> > > TIter next(dir);
> > >
> > > while ((file = (TSystemFile*)next())) {
> > > // do something in this file
> > > ...
> > > }
> > >
> > > As an additional feature, one could have a constructor that uses
> > > wildcard globing:
> > >
> > > TSystemDirectory dir("some directory", "*.root");
> > >
> > > If using a TIter would not be feasable for TSystemDirectory, could one
> > > at least have something like:
> > >
> > > UInt_t TSystemDirectory::GetEntries();
> > > TSystemFile* TSystemDirectory::At(UInt_t i);
> > >
> > > so that one may iterate through the list in a sligtly more clumbersome
> > > way:
> > >
> > > Int_t n = dir.GetEntries();
> > >
> > > for (Int_t i = 0; i < n; i++) {
> > > file = dir.At(i);
> > > // do something in this file
> > > ...
> > > }
> > >
> > > I realise ofcourse, that this would mean taking the internal list
> > > initialisation out of the Browse method, and into something else like
> > > say Initialise. The list can then be created "just-in-time":
> > >
> > > TSystemDirectory::Browse(TBrowser* b) {
> > > //
> > > if (!fListOfDirEntries)
> > > Initialise();
> > > ...
> > > }
> > >
> > > and so on. I don't see why you don't have "." and ".." in the
> > > list. I'd imagine something like
> > >
> > > TSystemDirectory::Browse(TBrowser* b) {
> > > //
> > > .
> > > TString *name = GetTitle();
> > > if (!name->CompareTo(".."))
> > > *name = gSystem->DirName(gSystem->WorkingDirectory());
> > > ...
> > > }
> > >
> > > would work.
> > >
> > > Anyway, just a few thoughts on this. I've this functionallity is in
> > > ROOT somewhere and I've just overlooked it, then I'm sorry for
> > > bothering you, and could someone please point out to me where -
> > > thanks.
> > >
> > > Yours,
> > >
> > > Christian -----------------------------------------------------------
> > > Holm Christensen Phone: (+45) 35 35 96 91
> > > Sankt Hansgade 23, 1. th. Office: (+45) 353 25 305
> > > DK-2200 Copenhagen N Web: www.nbi.dk/~cholm
> > > Denmark Email: cholm@nbi.dk
> > >
>
> Hi,
> if anybody is going to improve TSystemDirectory class, please look at
> http://doc.trolltech.com/qdir.html. I think much of this is desirable
> to be in ROOT too.
>
> Regards. Valeriy
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