writing branches to different files

From: Gene Van Buren (gene@bnl.gov)
Date: Wed Mar 29 2000 - 00:18:56 MEST 

Hi. I have the same question as was posed in this
posting to roottalk over a year ago - I saw no replies
in the archives:

-Gene Van Buren

----
>From: helmut (helmut@charm.ep1.ruhr-uni-bochum.de)
>Date: Thu Jan 28 1999 - 18:47:10 MET

Hi Rooters,

in how far is it implemented in TBranch to use the SetFile method for
TBranchClones and TBrachObjects. The SetFile method works fine for
simple
Branches of an automaticely splitted TTree. For example:

MainEvent.cxx in $ROOTSYS/test

                .
                .
                .
                
        tree->Branch("event", "Event", &event, bufsize,split); (split==1
!)

        TBranch* tmpBr=tree->GetBranch("fTracks.fMass2");
        tmpBr->SetFile("fTracks.fMass2.root");
                .
                .
                .

But if we try to split the tree to different files manually, e.g.

        .
        .
        .

//   tree->Branch("event", "Event", &event, bufsize,split);

void* address=event->GetTracks();
TBranch* tmpB=tree->Branch("ggtracks", &address, bufsize, split);
tmpB->SetFile("ggtracks.root");

void* address1=&(event->fNtrack);
tmpB=tree->Branch("members", address1,"ugu/I:aga/I:peng/I", bufsize);
tmpB->SetFile("membersOfEvent.root");

void* address2=event->GetHeader();  // (EventHeader inherits from
TObject)
tmpB=tree->Branch("header","EventHeader", &address2, bufsize, split);
tmpB->SetFile("header.root");

, we encountered the problem that none of the files are created. The
branches
are all written to the event.root file.
Does the SetFile method not work for the TBranchClones and
TBranchObjects, but
just for simple Branches ?

Cheers

        Helmut and Bergi

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