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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