Rene,
Thanks for looking into this. Attached are the two files
Ed
> -----Original Message-----
> From: brun@pcbrun.cern.ch [mailto:brun@pcbrun.cern.ch]On Behalf Of Rene
> Brun
> Sent: Thursday, September 04, 2003 1:25 AM
> To: Ed Oltman
> Cc: Roottalk@Pcroot. Cern. Ch
> Subject: Re: [ROOT] backward compatibiltiy problem
>
>
> Hi Ed,
>
> Could you send me your files test30505.root and test.root as mail
> attachements?
>
> Rene Brun
>
> Ed Oltman wrote:
> >
> > Hello,
> > I have a bunch of files created with win32 version of root
> 3.05/5. These
> > files contain lots of root objects including TF1s. I have
> recently switched
> > to gdk version of root 3.05/7. I can open and read these files (3.05/5
> > generated) without problem. However, if after opening one of
> these files a
> > create a new TF1 object and then write that out, I do have a
> problem: That
> > TF1 object becomes unreadable. HEre's the kind of error I Get:
> >
> > Error in <TBuffer::CheckByteCount>: object of class TF1 read
> too few bytes:
> > 1079 instead of 1151
> > Warning in <TBuffer::CheckByteCount>: TF1::Streamer() not in
> sync with data
> > on file, fix Streamer()
> >
> > Here's how do demonstrate the problem. First, in root version
> 3.05/5 do the
> > following:
> >
> > TFile *f = new TFile("test30505.root","recreate")
> > TH1F *ph = new TH1F("ph","test",100,-5.,5.)
> > ph->FillRandom("gaus",100000)
> > ph->Fit("gaus")
> > ph->Write()
> > f->Close()
> > .q
> >
> > Then, run root version 3.05/7 and do the following:
> >
> > TFile *f = new TFile("test30505.root")
> > TH1F *ph = (TH1F *)f->Get("ph")
> > ph->Draw() // no
> problem here!
> > //
> > // Now, create a new TF1 attached to a new TH1
> > //
> > TH1F *ph1 = new TH1F("ph1","test1",100,-5.,5.)
> > ph1->FillRandom("gaus",100000)
> > ph1->Draw()
> > ph1->Fit("gaus")
> > TFile *f1 = new TFile("test.root","recreate")
> > ph1->SetDirectory(f1)
> > ph1->Write()
> > f1->Close()
> > .q
> >
> > Now run 3.05/7 again and do the following:
> >
> > TFile *f = new TFile("test.root")
> > ph1->Draw()
> >
> > and the error message appears:
> >
> > Error in <TBuffer::CheckByteCount>: object of class TF1 read
> too few bytes:
> > 1079 instead of 1151
> > Warning in <TBuffer::CheckByteCount>: TF1::Streamer() not in
> sync with data
> > on file, fix Streamer()
> >
> > Note: if you try to read test.root from version 3.05/5 - it
> works fine and
> > the TF1 is ok!
> >
> >
> ------------------------------------------------------------------
> --------------
> > Name: winmail.dat
> > winmail.dat Type: application/ms-tnef
> > Encoding: base64
>
>
>
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