Re: [ROOT] How to list files

From: Valeriy Onuchin (Valeri.Onoutchine@cern.ch)
Date: Wed Jul 30 2003 - 10:12:41 MEST


 Hi Satoru,

void lf()
{
   TIter next(gROOT->GetListOfGlobals(1));
   TGlobal *global;
   while ((global=(TGlobal*)next())) {
     TString type = global->GetTypeName();
     if (type=="TFile") {
       TFile *file = (TFile*)gInterpreter->Calc(global->GetName());
       if (file && file->IsOpen())
         printf("%s: %s\n", global->GetName(),file->GetName());
     }
   }
 }
HTH. Regards. Valeriy


> Hi, Valeriy,
> thank you for reply.
> 
> I wrote your solution as a function in rootalias.C with a little
> modification to avoid SegV when no file is opened.
> 
> void lf()
> {
>   TIter next(gROOT->GetListOfGlobals());
>   TGlobal *global;
>   while ((global=(TGlobal*)next())) {
>     TString type = global->GetTypeName();
>     if (type=="TFile") {
>       TFile *file = (TFile*)gInterpreter->Calc(global->GetName());
>       if (file && file->IsOpen())
> printf("%s: %s\n", global->GetName(),file->GetName());
>     }
>   }
> }
> 
> But, unfortunately, this does not always work properly.
> 
>   *******************************************
>   *                                         *
>   *        W E L C O M E  to  R O O T       *
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>   *   Version   3.05/05       15 May 2003   *
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> 
> FreeType Engine v2.1.3 used to render TrueType fonts.
> Compiled for linux with thread support.
> 
> CINT/ROOT C/C++ Interpreter version 5.15.86, Apr 29 2003
> Type ? for help. Commands must be C++ statements.
> Enclose multiple statements between { }.
> root [0] TFile f("foo.root")
> root [1] lf()
> gFile: foo.root
> f: foo.root
> root [2] f.Close()
> root [3] lf()
> root [4] lf()
> root [5] lf()
> root [6] TFile f("foo.root")
> root [7] lf()
> gFile: foo.root
> f: foo.root
> root [8] TFile f2("bar.root")
> root [9] lf()
> gFile: bar.root
> f: foo.root
> root [10] 
> 
> "f2" is not listed now.
> Is this an unreasonable demand?
> 
>    Best regards,
>    Satoru Kameoka
> 
> 
> From: "Valeriy Onuchin" <Valeri.Onoutchine@cern.ch>
> Subject: Re: [ROOT] How to list files
> Date: Tue, 29 Jul 2003 15:52:26 +0200
> Message-ID: <066001c355d8$a50ebfd0$c1848a89@cern.ch>
> 
> >  Hi Satoru KAMEOKA,
> > 
> > TIter next(gROOT->GetListOfGlobals());
> > TGlobal *global;
> > TFile *file;
> > while ((global=(TGlobal*)next())) {
> >     TString type;
> >     type = global->GetTypeName();
> >     if (type=="TFile") {
> >         file = (TFile*)gInterpreter->Calc(global->GetName());
> >         printf("%s: %s\n", global->GetName(),file->GetName());
> >     }
> > }
> > 
> > HTH. Regards. Valeriy
> > 
> > > Hi, Valeriy,
> > > Thank you for reply.
> > > The way you taught surely shows file name and its contents, but not
> > > associated object "instance name". 
> > > 
> > > What I hope is, when some files are opened,
> > > root[] TFile f1("foo.root")
> > > root[] TFile f2("bar.root")
> > > root[] TFile f3("hoge.root")
> > > 
> > > some command can show the list as below.
> > > root[] some_command
> > > f1     "foo.root"
> > > f2     "bar.root"
> > > f3     "hoge.root"
> > > 
> > > Yes, I can understand that we can easily retrieve TFile object pointer
> > > from file name even if I've fogotten the instance names(f1, f2, f3).
> > > But I feel such command would be useful, because I sometimes attempt
> > > to use already connected TFile object by mistake and cause
> > > segmentation violation, like
> > > root[] TFile f("A_file.root")
> > > root[] TFile f("Another_file.root")
> > > 
> > > Anyway, thanks a lot.
> > > 
> > > Best regards,
> > > S.Kameoka
> > > 
> > > From: "Valeriy Onuchin" <Valeri.Onoutchine@cern.ch>
> > > Subject: Re: [ROOT] How to list files
> > > Date: Mon, 28 Jul 2003 17:07:52 +0200
> > > Message-ID: <028001c3551a$04c250a0$c1848a89@cern.ch>
> > > 
> > > >  Hi Satoru,
> > > > 
> > > > TIter next(gROOT->GetListOfFiles());
> > > > TObject *obj;
> > > > while ((obj=next())) obj->ls();
> > > > 
> > > > HTH. Regards. Valeriy
> > > > 
> > > > > Dear ROOT developers and users,
> > > > > 
> > > > > is there any way to list currently opened files?
> > > > > I found gROOT->GetListOfFiles()->Print() prints file names,
> > > > > but I want to know also associated TFile object instance names
> > > > > as "ldir //" command of PAW shows file name and LUN.
> > > > > 
> > > > > 
> > > > >    Best regards,
> > > > >    Satoru Kameoka
> > > > >    
> > > > > 
> > > > 
> > > 
> > 
> 



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