Re: saving a TClonesArray in a TTree

Dear Rene,

thank you very much for your quick answer; please find in

/afs/cern.ch/user/g/govoni/public/TClonesArraySaving.tar.gz

the class code.

pietro

On 30 May, 2006, at 15:36, Rene Brun wrote:

> 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