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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