saving a TClonesArray in a TTree

From: Pietro Govoni <pietro.govoni_at_mib.infn.it>
Date: Tue, 30 May 2006 14:31:27 +0200

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 - 14:31:09 MEST