Re: [ROOT] TTree bug. No more mistery.

From: Inkyu.Park@cern.ch
Date: Thu Apr 26 2001 - 22:38:27 MEST 

Hi Anton,

I quickly tested your macro with a change of your class TTrade to TVector.
And it works just fine! See what I did.

I can test with more complex class if you wish.

Cheers,
Inkyu

Write.C
{
  gROOT->Reset();

  TFile *File = new TFile("anton.root","RECREATE");

  TVector *Vector = new TVector();
  TTree *Tree = new TTree("VectorTree", "");
  VectorTree     ->Branch("Vector", "TVector", &Vector, 4*1024, 1);
  VectorTree     ->Write();

  for(Int_t i=0;i<20000;i++) {
    Int_t N = VectorTree->GetEntries();
    if (N) {
      VectorTree->GetEntry(0);
      VectorTree->GetEntry(N-1);
    }
    //Vector->Set(i,i,i,i);
    VectorTree->Fill();
  }
  Tree->AutoSave();
  delete Tree;
  delete File;
}

Read.C
{
  gROOT->Reset();

  TFile *File = new TFile("anton.root", "UPDATE");
  
  TVector *Vector = new TVector();
  TTree *Tree = (TTree*)File.Get("VectorTree");
  Tree->SetBranchAddress("Vector", &Vector);
  Tree->Print();
  
  Int_t N = Tree->GetEntries();
  for(Int_t i=0;i<N;i++) {
    Tree->GetEntry(i);
    Vector->Print();
  }
  //Vector->Set(0,0,0,0);
  printf("Printing second time ... \n");
  
  for(Int_t i=0;i<10;i++) {
    Tree->GetEntry(i);
    Vector->Print();
  }
}

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