Hello, It's not easy to have a simplified version of my code, but if it's necessary I will provide you. I understand why the 2nd solution did not work: actually, I have to open a second file where I get data to fill my Tree. So I have this order of instructions: TTree *TREE = new TTree(...) TFile *data_file = new TFile(name_data_file); //..fill tree data_file->Close(); TFile *myfile=new TFile(name_ntuple, "RECREATE"); TREE->Write(); myfile->Close(); //"delete myfile;" doesn't work I just have changed the place of data_file->Close(). Indeed it was at the end, so when I tried to put "TFile *myfile=new ..." at the top as you said, of course the TREE->Write() wanted write in "data_file" instead of "myfile" (that's why I had the message "... not writable", I did not see that the message concerned "data_file" and not "myfile", sorry). But even placing data_file->Close() before writing the tree, it does not work when I put "TFile *myfile=new ..." at the top. ---- In conclusion, I have to manage 2 files, and I want write a Tree in one of them. The instructions above work for small files, but not for big ones. Do you see where could be the problem ? Matthieu. On Mon, 29 Sep 2003, Rene Brun wrote: > 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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