//_____________________________________// GetGUID(TString &guid) { ofstream myfile ("guid.txt"); if (myfile.is_open()) { TFile *f = TFile::Open("AliESDs.root","read"); if(f->IsOpen()) { guid = f->GetUUID().AsString(); myfile << "AliESDs.root \t"<<f->GetUUID().AsString(); cout<<guid.Data()<<endl; myfile.close(); } else cout<<"Input file not found"<<endl; } else cout<<"Output file can't be created..."<<endl; }