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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