Hi Olivier,
When you give the address of the pointer in TTree::Branch,
you must make sure that at this address, you will always have
a valid pointer pointing to each of your TClonesArray.
In your case, you use the same address for all TClonesArrays.
I suggest that in your Run class, you have two arrays
TClonesArray *fRClusters[7];
TClonesArray *fPhiClusters[7];
then when you create a branch, you do:
gRun->GetTree()->Branch(RName[i],&fRClusters[i],bufsize,split);
Note that it will make sense to have this code directly in a member
function of your Run class.
Rene Brun
On Wed, 31 Mar 1999, Olivier Dormond wrote:
> Rene Brun wrote:
> >
> > Olivier,
> > I suggest you build a TList of TClonesArray to be more general.
> > You can then loop on the TList to create a branch for each
> > TClonesArray.
> > There is an example in the ATLFast package.
> >
> > Rene Brun
>
> Hi Rooters,
>
> I've try to solve my problems with your indication but without success.
> So this time I'll try to be as much clear as I can. Here is what I'm
> trying to do:
>
> Program's layout:
> - run object containing pointers to the current event, to a TTree and
> some more informations.
> - FZReader object used to fill the current event with data from a
> zebra file.
> - event object containing all the reconstructed data which is mainly
> the clusters informations. This is implemented, now, by a TList of
> TClonesArray * containing cluster objects.
> - cluster objects storing clusters information.
>
> Program's execution sequence:
> - A run object is created which create a TTree and an event object.
> - The tree is created by issuing a
>
> fTree->Branch("event", "LVxEvent", &fEvent, 32000, 1);
>
> in a method of the run object and than a similar method is called
> on the event object which does the following things:
>
> void LVxEvent::MakeBranch( Text_t *name, Int_t bufsize, Int_t
> splitlevel )
> {
> TIter nextR(&fgRClusters), nextPhi(&fgPhiClusters);
> TClonesArray *clusters;
> int i=0;
> Text_t *RName[] = {"R0","R1","R2","R3","R4","R5","R6"};
> Text_t *PhiName[] =
> {"Phi0","Phi1","Phi2","Phi3","Phi4","Phi5","Phi6"};
>
> while( clusters = (TClonesArray *)nextR() )
> gRun->GetTree()->Branch(RName[i++], &clusters, bufsize,
> splitlevel);
> i=0;
> while( clusters = (TClonesArray *)nextPhi() )
> gRun->GetTree()->Branch(PhiName[i++], &clusters, bufsize,
> splitlevel);
> }
>
> N.B. I also tried clusters instead of &clusters.
>
> - A loop is done on the fz file in which the next event is read. The
> cluster maker is than run and a short display of the resulting data
> is printed out. Next the tree is filled (by fTree->Fill();) and at
> last the event is cleared.
>
> The program segfault next to the call to the Fill() method. dbx says:
>
> Segmentation fault in ptrgl.$PTRGL
> [/afs/cern.ch/na49/library.4/ROOT/pro/rs_aix41/root/lib/libRoot.a] at
> 0xd12e3868 ($t1)
> 0xd12e3868 ($PTRGL) 800b0000 lwz r0,0x0(r11)
> (dbx) where
> ptrgl.$PTRGL() at 0xd12e3868
> Fill__13TBranchClonesFv() at 0xd160ad8c
> Fill__5TTreeFv() at 0xd1401064
> FillTree()(0x204edbd8), line 106 in "LVxRun.cxx"
> unnamed block $b2, line 124 in "LVxMain.cxx"
> main(argc = 3, argv = 0x2ff21f48), line 124 in "LVxMain.cxx"
>
> I don't see what's wrong in my code. The TTree::Branch(..) method
> documentation says:
>
> "clonesaddress is the address of a pointer to a TClonesArray."
>
> That the case of &clusters but as it's the same for all the branch
> and it becomes invalid on exit of LVxEvent::MakeBranch(..) I've thought
> this might be the cause of my trouble.
>
> All ideas/comments are welcome!
>
> Cheers,
>
>
> Odie
> --
> +----------------------------------------------------------------------+
> | Olivier Dormond EMail : Olivier.Dormond@iphe.unil.ch |
> | IPHE - BSP - UNIL WWW : iphedec2.unil.ch/~odie |
> | CH-1015 Dorigny Phone : (++41 21) 692 3739 |
> | Switzerland Fax : (++41 21) 692 3605 |
> +----------------------------------------------------------------------+
>
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