import ROOT,argparse

parser=argparse.ArgumentParser(description='loop over fopi tree and do stuff')
parser.add_argument('rootfile',help='the root file with the fopi tree',type=str)
parser.add_argument('--hlp',help='display help',action='store_true')
args=parser.parse_args()

if args.hlp:
    parser.print_help()
    exit(0)

ROOT.gROOT.ProcessLine(".x rootlogon.C") 
ROOT.gROOT.ProcessLine('gROOT->SetStyle("Plain")')
ROOT.gROOT.LoadMacro("stlPYROOT.h+")

rfile=ROOT.TFile.Open(args.rootfile,'READ')
tree=rfile.Get('FOPITree')
if tree == None :
    print "No FOPITree in file", file
    if type(Rfile)==ROOT.TFile:
        Rfile.Close()
        exit()

tree.SetBranchStatus("*",1)

evt=-1
for e in tree:
    evt+=1
    print 'event:',evt
    for ctrk in e.CdcTrackBr:
        print 'rpc hit id:', ctrk.GetRpcHitID()
        if ctrk.GetRpcHitID()!=0:
            print 'rpc branch hit id:',e.RpcTrackBr.At(ctrk.GetRpcHitID()-1).GetID()
    for rtrk in e.RpcTrackBr:
        print 'rpc id:',rtrk.GetID()