root_to_csv.cxx

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#include <iostream>
#include "TFile.h"
#include "TTree.h"
#include <fstream>
using namespace std;
 
void root_to_csv(){
  TFile *f=new TFile("pre_data.root"); // opens the root file
  TTree *tr=(TTree*)f->Get("n103"); // creates the TTree object
  //tr->Scan(); // prints the content on the screen
 
  Float_t de, co, ch, bg;
  Int_t nh; // create variables of the same type as the branches you want to access
 
  tr->SetBranchAddress("dEdx_meas",&de); // for all the TTree branches you need this
  tr->SetBranchAddress("costheta",&co);
  tr->SetBranchAddress("charge",&ch);
  tr->SetBranchAddress("bg",&bg);
  tr->SetBranchAddress("nhits",&nh);
 
  ofstream myfile;
  myfile.open ("pre_data.txt");
 
  for (int i=0; i<tr->GetEntries(); i++){
    // loop over the tree
    tr->GetEntry(i);
    myfile << de << "," << co << ","<< ch << "," << bg << "," << nh << "\n"; //write to file
  }
  myfile.close();
}