I am afraid that we will not make any progress without looking at a simplified version of your code reproducing this problem. Rene Brun Matthieu Lechowski wrote: > > Hello, > Thanks, but unfortunately it doesn't work. > The first solution doesn't change anything, and with the second ROOT > tells me my file is not writable (Error in <TTree::Write>: File ... is > not writable). > Have you others ideas ? > Thank you. > > Matthieu. > > On Fri, 26 Sep 2003, Rene Brun wrote: > > > Matthieu, > > > > This seems to be a problem with the destructor of your TTree when > > you close the file. > > You can try two solutions: > > 1- after TREE.Write(); add the statement > > TREE.SetFile(0); > > > > 2- Do not create your Tree in the stack, but in the heap with > > TFile *myfile=new TFile(name_ntuple, "RECREATE"); > > TTree *TREE = new TTRee(... > > //..fill tree > > TREE->Write(); > > delete myfile; //do not delete TREE > > > > Rene Brun > > > > Matthieu Lechowski wrote: > > > > > > Hello, > > > > > > ROOT leaves without saying anything when I try to write a TTree in a > > > TFile, and the file has only few bytes (and can not be opened of > > > course). > > > > > > I have a global tree: TTree TREE("T","TREE"); > > > In a function, I fill it, then: > > > TFile *myfile=new TFile(name_ntuple, "RECREATE"); > > > TREE.Write(); > > > myfile->Close(); > > > > > > This is the way I always used, and it always worked, but this time I > > > have a big Tree and this doesn't work, I don't know why. > > > Its size is less than the limit 2Gb, I think it should be around 80Mb > > > with 100.000 entries (I have already a similar file of 8Mb with 10.000 > > > entries that I succeeded to write). > > > > > > Have you an idea of what goes wrong ? > > > Thank you. > > > > > > Matthieu Lechowski > > > LAL Orsay > > > > > > lxplus > > > ROOTSYS=/afs/cern.ch/sw/root/v3.05.05/rh73_gcc2952/root > >
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