Example TChain root file loading for rat-4.5.0

Load.cc

////////////////////////////////////////////////////////
/// My preferred method to load a root file in root.
/// Must load in root as .L Load.cc+
///
/// 11/10/2012 : New File
////////////////////////////////////////////////////////
 
#include <RAT/DS/Root.hh>
#include <RAT/DS/EV.hh>
#include <RAT/DS/Run.hh>
 
#include <TH1D.h>
#include <TChain.h>
#include <TFile.h>
 
#include <time.h>
using namespace std;
 
void
LoadRootFile( const char* lpFile,
              TChain **tree,
              TChain **runTree,
              RAT::DS::Root **rDS,
              RAT::DS::Run **rRun );
 
void 
DoSomething( const char* inFile )
{
  // Load the root file first
  RAT::DS::Root* rDS;
  RAT::DS::Run* rRun;
  TChain *tree, *runTree;
  LoadRootFile( inFile, &tree, &runTree, &rDS, &rRun );
  
  time_t codeStart = time( NULL );
 
  for( int iEvent = 0; iEvent < tree->GetEntries(); iEvent++ )
    {
      if( iEvent % 100 == 0 )
        cout << iEvent << " finished at " << time( NULL ) - codeStart << endl;
      tree->GetEntry( iEvent );
      // Do something here
    }
}
 
void
LoadRootFile( const char* lpFile,
              TChain **tree,
              TChain **runTree,
              RAT::DS::Root **rDS,
              RAT::DS::Run **rRun )
{
  *tree = new TChain( "T" );
  (*tree)->Add( lpFile ); 
  *runTree = new TChain( "runT" );
  (*runTree)->Add( lpFile );
 
  *rDS = new RAT::DS::Root();
 
  (*tree)->SetBranchAddress( "ds", &(*rDS) );
 
  *rRun = new RAT::DS::Run();
 
  (*runTree)->SetBranchAddress( "run", &(*rRun) );
  (*runTree)->GetEntry();
}

ROOT.c

.L Load.cc+
DoSomething( "file*.root" );