#include "TFile.h"
#include "TH1.h"
#include "TH2.h"
#include "TChain.h"
#include "TTree.h"
#include "TLeaf.h"

#define UpdateEvents    2000

using namespace std;

TLeaf *xpos;

void GetValue(const char *filename = "eu152_11july_afterGlitch.001", const char *treename = "RoseNIAS")
{
	const char* nmHis[20];
	Int_t NoPara;
	Long64_t nentries;

	TChain *fChain = new TChain(treename);
	fChain->AddFile(filename);
	TObjArray*obj = fChain->GetListOfBranches();
	NoPara = obj->GetEntries();			//Number of parameters in Tree and hence in experiment
	nentries = fChain->GetEntriesFast();		//Number of events in the Tree
	fChain->SetBranchStatus("*", 1);		//Activate all branches
	//fChain->SetMakeClass(1);
	
	cout << "\n Total Number Entries in the TChain is:\t" << nentries << endl;

	for (Long64_t k = 0; k < nentries; ++k) { 
		Long64_t ientry = fChain->LoadTree(k);
		if (ientry < 0) break;
		fChain->GetEntry(k);
		for (Int_t i=0; i<NoPara; ++i){
			Double_t fdata = 0.;
			TBranch *br = dynamic_cast<TBranch*>(fChain->GetListOfBranches()->At(i));
			nmHis[i] = br->GetName();
			xpos = fChain->GetLeaf(nmHis[i]);
			fdata = xpos->GetValue();
			//
			// Then Fill Histograms with name "nmHis[i]" with "fdata"
			// cout << nmHis[i] << " :\t" << fdata << endl;
			//
			//
		}        
		if (k % UpdateEvents) continue;
		printf ("EVENTS = %8d\r", k);
		fflush (stdout);
	}
	printf ("EVENTS = %8d....\n", nentries);
}