{
    gSystem->Load("libFWCoreFWLite.so");
    AutoLibraryLoader::enable();
    gSystem->Load("libDataFormatsFWLite.so");
    #include "DataFormats/FWLite/interface/Handle.h"
    TFile file("H190ZZ4mu_RECO.root");
    fwlite::Event ev(&file);
    for( ev.toBegin();  ! ev.atEnd(); ++ev)
    {
        fwlite::Handle<std::vector<reco::Muon> > objs;
        objs.getByLabel(ev,"muons");
        //now can access data
        std::cout <<"size "<<objs.ptr()->size()<<std::endl;
    }
}

-- GunmoRyu - 11 Mar 2009