Re: [ROOT] rfio file - how to check if it is already opened

From: Jiri Chudoba (Jiri.Chudoba@cern.ch)
Date: Thu Feb 14 2002 - 14:46:53 MET 

Hi Fons,

I want to test if file is opened or not. The code works, because I get
a null pointer to TFile, but I would like to get rid of that error 
message because it looks like something is going wrong.

            Thanks, cheers,
                               Jiri.

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On 14 Feb 2002, Fons Rademakers wrote:

> Hi Jiri,
> 
>   for me this fails only when the file has not been opened. See:
> 
> root [0] TFile *n =
> (TFile*)gROOT->FindObject("rfio:/castor/cern.ch/user/r/rdm/hsimple.root")
> Error in <TROOT::cd>: No such file
> rfio:/castor/cern.ch/user/r/rdm/hsimple.root
> root [1] TFile *f =
> TFile::Open("rfio:/castor/cern.ch/user/r/rdm/hsimple.root")
> root [2] TFile *n =
> (TFile*)gROOT->FindObject("rfio:/castor/cern.ch/user/r/rdm/hsimple.root")
> root [3] n
> (class TFile*)0x86e0748
> 
> 
> Cheers, Fons.
> 
>

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