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// -*- C++ -*-
//
// This file is part of HepMC
// Copyright (C) 2014-2019 The HepMC collaboration (see AUTHORS for details)
//
/**
* @file rootIOTree_example_read.cc
* @brief Basic example of use of root I/O with tree: reading events from file
*
* @author Witold Pokorski/Andrii Verbytskyi
* @date 29/10/15
*/
#include "HepMC3/GenEvent.h"
#include "HepMC3/WriterAscii.h"
#include "HepMC3/ReaderRootTree.h"
#include "HepMC3/Print.h"
#include <iostream>
using namespace HepMC3;
/** Main */
int main(int argc, char **argv) {
if( argc<3 ) {
cout << "Usage: " << argv[0] << " <input_root_file> <output_hepmc3_file>" << endl;
exit(-1);
}
ReaderRootTree root_input (argv[1]);
WriterAscii text_output(argv[2]);
int events_parsed = 0;
while( !root_input.failed() ) {
GenEvent evt;
root_input.read_event(evt);
if( root_input.failed() ) break;
if( events_parsed == 0 ) {
cout << "First event: " << endl;
Print::listing(evt);
}
text_output.write_event(evt);
++events_parsed;
if( events_parsed%1000 == 0 ) {
cout << "Event: " << events_parsed << endl;
}
}
root_input.close();
text_output.close();
std::cout << "Events parsed and written: " << events_parsed << std::endl;
return 0;
}
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