[ROOT] How to recognize corrupted files ?

From: Frank Laue (laue@bnl.gov)
Date: Thu Oct 10 2002 - 21:59:50 MEST 

Hi:

When opening a corrupted file (maybe not closed properly) with
TFile::Open(...) ROOT does open the file and prints some warnings on the
screen. Is there any other means to identify that files as bad.

Is there a return value or a flag that one can easily check on in a
program ?

Thanks.

Cheers,
	Frank



> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch 
> [mailto:owner-roottalk@pcroot.cern.ch] On Behalf Of Rene Brun
> Sent: Thursday, October 10, 2002 11:16 AM
> To: Avdhesh Chandra
> Cc: roottalk@pcroot.cern.ch
> Subject: Re: [ROOT] graph array problem
> 
> 
> Hi,
> 
> I do not understand if what you try to do is:
>   - an array of TGraphErrors
>   - or one single TGraphErrors build with an array of points
>     and associated errors.
> 
> Please clarify by sending a complete running script.
> 
> Rene Brun
> 
> 
> 
> On Thu, 10 Oct 2002, Avdhesh Chandra wrote:
> 
> > 
> > Hi,
> >     I am trying to make graph array, so i can use it.
> > 
> >  programe looks like(where i am defining graph array)
> > 
> >  for(int i = 0 ; i < nent ; i++)
> >    {
> >      cout << "  Col[i]  " << Col[i] << endl;
> >      gr[i] = new TGraphErrors(n,Z,Ent[i],Ez,Eent[i]);
> >      gr[i]->SetMarkerColor(Col[i]);
> >      gr[i]->SetMarkerStyle(Sty[i]);
> >    }
> > 
> > when i am running my code  i am getting following message
> > 
> > ---------------------------------------------------
> >   Col[i]  7
> >   Col[i]  6
> > Error: Array index out of range gr -> [1]  valid upto gr FILE:test.C
> > LINE:156
> > 
> >  *** Break *** segmentation violation
> > ---------------------------------------------------
> > 
> > 
> > Which shows that when it goes secound time in the loop it 
> having problem.
> > Please let me know what i am doing worng.
> > 
> > Thanks for any help
> > Avdhesh
> > 
>

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