geant4获取同一个粒子产生的第一个次级光子从产生到消失的全部过程中每一步的能量变化，用代码演示一下

下面是一个使用 Geant4 模拟获取同一个粒子产生的第一个次级光子从产生到消失的全部过程中每一步的能量变化的代码示例：

#include "G4RunManager.hh"
#include "G4UImanager.hh"
#include "G4VisExecutive.hh"
#include "G4UIExecutive.hh"
#include "G4Event.hh"
#include "G4SDManager.hh"
#include "G4SystemOfUnits.hh"
#include "G4PhysicalConstants.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4Electron.hh"
#include "G4Gamma.hh"
#include "G4OpticalPhoton.hh"
#include "G4Scintillation.hh"
#include "G4OpBoundaryProcess.hh"
#include "G4LogicalVolume.hh"
#include "G4Material.hh"
#include "G4Box.hh"
#include "G4Tubs.hh"
#include "G4PVPlacement.hh"
#include "G4RunManager.hh"
#include "G4OpProcessSubType.hh"
#include "G4OpticalPhysics.hh"
#include "G4UserEventAction.hh"
#include "G4UserRunAction.hh"
#include "G4UserStackingAction.hh"
#include "G4UserTrackingAction.hh"
#include "G4UserSteppingAction.hh"
#include "G4SDManager.hh"
#include "G4SDParticleFilter.hh"
#include "G4UserLimits.hh"
#include "G4VPhysicalVolume.hh"
#include "G4TransportationManager.hh"
#include "G4StepLimiter.hh"

class RunAction : public G4UserRunAction {
public:
    virtual void BeginOfRunAction(const G4Run *) override {}
    virtual void EndOfRunAction(const G4Run *) override {}
};

class EventAction : public G4UserEventAction {
public:
    virtual void BeginOfEventAction(const G4Event *) override {}
    virtual void EndOfEventAction(const G4Event *) override {}
};

class TrackingAction : public G4UserTrackingAction {
public:
    virtual void PreUserTrackingAction(const G4Track *) override {}
    virtual void PostUserTrackingAction(const G4Track *) override {}
};

class SteppingAction : public G4UserSteppingAction {
public:
    virtual void UserSteppingAction(const G4Step *step) override {
        G4Track *track = step->GetTrack();
        G4String particleName = track->GetDefinition()->GetParticleName();
        G4double energy = track->GetKineticEnergy();
        G4double stepLength = step->GetStepLength();
        G4double deltaEnergy = step->GetDeltaEnergy();
        G4cout << "Particle: " << particleName
               << ", Energy: " << energy / eV << " eV"
               << ", Step length: " << stepLength / mm << " mm"
               << ", Delta energy: " << deltaEnergy / eV << " eV"
               << G4endl;
    }
};

int main(int argc, char **argv) {
    G4RunManager *runManager = new G4RunManager();

    G4UImanager *uiManager = G4UImanager::GetUIpointer();

    G4VisManager *visManager = new G4VisExecutive();
    visManager->Initialize();

    G4UIExecutive *ui = new G4UIExecutive(argc, argv);
    uiManager->ApplyCommand("/control/execute vis.mac");
    ui->SessionStart();
    delete ui;

    delete visManager;
    delete runManager;

    return 0;
}

在上述代码中，我们定义了一个 `SteppingAction` 类来处理粒子每一步的信息。在 `UserSteppingAction` 函数中，我们可以获取粒子的信息，如类型、能量、步长和能量损失，然后将这些信息输出到控制台。这个程序只是一个简单的示例，你需要根据你的具体需求修改代码。