{
  TFile *file = new TFile("demo.root","recreate");
  
  TH1F *h = new TH1F("hwoow","test",1000,-2,2);
  h->FillRandom("gaus");
  //h->Write();
  file->WriteObject(h,"h9585");
  file->Close();



  file->Open("demo.root");  //TFile::
  if(!file->IsZombie()){
    TH1F *h2=(TH1F*)  file->Get("h9585");

    cout << "Test session started ******************************" << endl;
    cout << "Name   : " << h2->GetName() << endl;
    cout << "Npars  : " << h2->GetNdivisions() << endl;
    file->Close();
  }
}


/*
bash-3.2$ root writeROOT.C 
  *******************************************
  *                                         *
  *        W E L C O M E  to  R O O T       *
  *                                         *
  *   Version   5.25/02 29 September 2009   *
  *                                         *
  *  You are welcome to visit our Web site  *
  *          http://root.cern.ch            *
  *                                         *
  *******************************************

ROOT 5.25/02 (trunk@30530, Sep 29 2009, 15:28:19 on linuxx8664gcc)

CINT/ROOT C/C++ Interpreter version 5.17.00, Dec 21, 2008
Type ? for help. Commands must be C++ statements.
Enclose multiple statements between { }.
root [0] 
Processing writeROOT.C...
Test session started ******************************
Error: illegal pointer to class object h2 0x0 502  writeROOT.C:17:

*/