radBB/convert_root_to_txt.cxx

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#include<iostream>
#include<fstream>
#include<string>
#include<iomanip>
#include<stdio.h>
 
void convert_root_to_txt(){
  TChain *ch = new TChain("Bhabha");
  ch->Add("*.root");
  int runNO, evtNO, trkNO;
  double p_ep, p_em;
  int trackId_em, trackId_ep;
  ch->SetBranchAddress("p_cms_ep",&p_ep);
  ch->SetBranchAddress("p_cms_em",&p_em);
  ch->SetBranchAddress("run",&runNO);
  ch->SetBranchAddress("rec",&evtNO);
  ch->SetBranchAddress("trackId_em",&trackId_em);
  ch->SetBranchAddress("trackId_ep",&trackId_ep);
  long int len_entry = ch->GetEntries();
  cout << "len_entry: " << len_entry << endl;
 
  ofstream outfile("test.txt", ios::out);
  if(!outfile){
    cerr << "open error" << endl;
    exit(1);
  }
  int low_trkId;
 
  for(long int j=0; j<len_entry; j++){
    if(j%10000 == 0) cout << "j " << j << endl;
    ch->GetEntry(j);
    low_trkId = (p_ep>p_em) ? trackId_em :  trackId_ep;
    outfile << setiosflags(ios_base::left) << setw(10) << runNO 
        << setiosflags(ios_base::left) << setw(10) << evtNO
        << setiosflags(ios_base::left) << setw(10) << low_trkId << endl;
  }
 
}