Re: saving a TClonesArray in a TTree

What you do should work. However, you forgot to attach your class (at least the class header),
so it is difficult to come with better diagnostics.

Rene Brun

Pietro Govoni wrote:
> dear Rooters,
>
> I am trying to save a TClonesArray in a TTree in the following way:
>
> CalibTree::CalibTree (const std::string & fileName,
> const std::string & treeName):
> m_file (0), m_tree (0), m_data (0), m_dataSize (0)
> {
> TDirectory *dir = gDirectory;
> m_file = new TFile (fileName.c_str (),"RECREATE") ;
> m_file->cd () ;
> m_tree = new TTree (treeName.c_str(),"Analysis tree") ;
> m_tree->SetAutoSave (10000000) ;
> dir->cd();
>
> // m_tree->cd () ;
> m_data = new TClonesArray (TRootCalibObj::Class(), 1) ;
> m_data->ExpandCreateFast (1) ;
>
> m_tree->Branch ("EGCO", &m_data, 64000, 2) ;
> m_tree->Print () ;
> }
>
>
> The content of the TClonesArray, that is a TRootCalibObj, inherits
> from a TObject.
> As far as I understood, I would expect the TTree to be filled by a set
> of branches, each of them corresponding to a variable of the
> TRootCalibObj.
> Nevertheless, the Print () of the Tree only gives as output:
>
> Warning in <TTree::Bronch>: Using split mode on a class: TObject with
> a custom Streamer
> ******************************************************************************
>
> *Tree :Analysis : Analysis
> tree *
> *Entries : 0 : Total = 2591 bytes File Size
> = 0 *
> * : : Tree compression factor =
> 1.00 *
> ******************************************************************************
>
> *Br 0 :EGCO :
> EGCO_ *
> *Entries : 0 : Total Size= 2726 bytes One basket in
> memory *
> *Baskets : 0 : Basket Size= 64000 bytes Compression=
> 1.00 *
> *............................................................................*
>
> *Br 1 :EGCO.fUniqueID :
> fUniqueID[EGCO_] *
> *Entries : 0 : Total Size= 766 bytes One basket in
> memory *
> *Baskets : 0 : Basket Size= 64000 bytes Compression=
> 1.00 *
> *............................................................................*
>
> *Br 2 :EGCO.fBits :
> fBits[EGCO_] *
> *Entries : 0 : Total Size= 742 bytes One basket in
> memory *
> *Baskets : 0 : Basket Size= 64000 bytes Compression=
> 1.00 *
> *............................................................................*
>
>
>
> What I am missing?
>
>
> Thank you very much,
>
> pietro
Received on Tue May 30 2006 - 15:37:04 MEST