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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