About TChain

From: Hayk Hakobyan <hayk_at_jlab.org>
Date: Mon, 9 Jan 2006 10:53:03 -0500 (EST)

Dear ROOTers,

Here is attached the following program



 {
   gROOT->Reset();
   TChain *ch = new TChain("TTT");
   ch->Add("file1.root");
   ch->Add("file2.root");
   Float_t Q2;    

   TBranch *b_Q2 =TTT->GetBranch("Q2");    

   b_Q2->SetAddress(&Q2);

   Long64_t localEntry = ch->LoadTree(5);    b_Q2->GetEntry(localEntry);
   cout<<Q2<<endl;
   return 0;
 }


file1.root and file2.root are C-structure .root files with TTT tree which in has
Q2 branch.

When I run this program I get

But it is working perfectly if I enter each line from program by hand using CINT.

What is the problem?

Thanks for any help,
Hayk.

Received on Mon Jan 09 2006 - 16:53:12 MET

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