7int main(
int argc,
char* argv[]){
10 cout <<
"usage: readEvtFile file.root" << endl;
14 TFile *f1 = TFile::Open(argv[1]);
17 cerr <<
"File can't be open." << endl;
27 EvtTree->SetBranchAddress(
"Evt",&evt);
28 Long64_t nentries = EvtTree->GetEntries();
29 for (Long64_t i=0; i<nentries; i++) {
31 cout <<
"Event ID: " << evt->
id << endl;