Dear Rene
Thank you for your fast reply.
Calling fTree->AddFriend(atree) did solve my problem.
What I do not quite understand is that calling
fTree->AddFriend(atree->GetName(), fFile);
and later calling
fTree->RemoveFriend(atree);
seems to be working, too.
Is this an alterantive correct way or does it only work by chance?
Best regards
Christian
Rene Brun wrote:
> Hi Christian,
>
> Before calling AddFriend, you must close atree and fFile.
> Do:
>
> TString tname = atree->GetName()
> TString fname = fFile->GetName()
> atree->Write();
> delete fFile;
> fTree->AddFriend(tname,fname);
>
> or call the other TTree::AddFriend constructor
> atree->Write();
> fTree->AddFriend(atree);
>
> Rene Brun
>
> On Sun, 20 Jun
> 2004, cstrato wrote:
>
>
>>Dear Rooters
>>
>>I have the following situation:
>>First I open an existing file "fDataFile" which contains some data
>>trees. In a first step I add these trees as friends to a tree "fTree".
>>Then I create a new file "fFile" where the result tree "atree" should be
>>stored. Later, I create the result tree "atree" in a class method.
>>After filling "atree" I want to add "atree" as friend to fTree, too.
>>The relevant code fragment of the method looks like this:
>> TTree *atree = new TTree(treename, "");
>> // fill atree
>> fFile->cd();
>> atree->Write();
>> fTree->AddFriend(atree->GetName(), fFile->GetName());
>>
>>In this case AddTree() results in the following message:
>>Warning in <TFile::Init>: file /Users/cs/ROOT/rootcode/tmp.root probably
>>not closed, trying to recover
>>Info in <TFile::Recover>: /Users/cs/ROOT/rootcode/tmp.root, recovered
>>key TTree:Test at address 350
>>Warning in <TFile::Init>: successfully recovered 1 keys
>>
>>Nevertheless, everything works fine including the call to the
>>destructors, where I delete "fDataFile" with "SafeDelete(fDataFile)".
>>
>>In contrast, when I add "atree" as friend using:
>> fTree->AddFriend(atree->GetName(), fFile);
>>everything works fine until I call the destructors.
>>When I try to delete "fDataFile" with "SafeDelete(fDataFile)" then
>>root crashes beyond recovery with "*** Break *** bus error"
>>
>>However, if I remove "atree" after usage by calling in a different method
>> fTree->RemoveFriend(atree);
>>then everything works fine again and I can call "SafeDelete(fDataFile)"
>>in the destructor.
>>
>>Does anybody have an idea what might be the reason for this behavior?
>>(I am afraid ths code is too complex to extract a simple macro.)
>>
>>Thank you in advance
>>Best regards
>>Christian
>>-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
>>C.h.r.i.s.t.i.a.n. .S.t.r.a.t.o.w.a
>>V.i.e.n.n.a. .A.u.s.t.r.i.a
>>-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
>>
>
>
>
>
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