problems with energy deposit

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Hi all!

I'm beginner in Geant4. I have such a problem. I must gather from every initial particle energy deposit in my detector. I do it, as it shown below

------------------------------------------

#include "TrackingAction.hh"
#include "G4TrackingManager.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4UnitsTable.hh"
#include "G4String.hh"

TrackingAction::TrackingAction() {}

void TrackingAction::PreUserTrackingAction(const G4Track* aTrack)

{
    G4double energy,edep;
    G4String name,volume;

    name = aTrack->GetDefinition()->GetParticleName();

    energy = aTrack->GetKineticEnergy();

    volume = aTrack->GetVolume()->GetName();

    edep =aTrack->GetStep()->GetTotalEnergyDeposit();

    if ((name=="gamma") && (energy == 1.17*MeV)) 
	{ PutIntoSpectr(E_total);
	  E_total=0; 
	}

    if((volume=="csi_1") || (volume=="csi_2") || (volume=="csi_3") || (volume=="csi_4"))
	{E_total=E_total+edep;}
}

void TrackingAction::PutIntoSpectr(G4double energy)

{

    FILE *f;

    f=fopen("spectr.txt", "w");

    fprintf(f,"\n", energy);

    fclose(f);

}

---------------------------------------------------------

But it doesn't works, and it didn't make the file spectr.txt, and when it is making the standard output file, it shows information only for the first initial particle:

---------------------------------------------------------

*********************************************************************************************************
* G4Track Information:   Particle = gamma,   Track ID = 1,   Parent ID = 0
*********************************************************************************************************

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    0      0         0       400      1.17         0         0         0  expHall_phys    initStep

---------------------------------------------------------

and at the end it writes "Segmentation fault".

where is my mistake.

THANKS in Advance hayk gabrielyan