output file

src/G4System.cc

@@ -19,6 +19,7 @@ void G4System::init(GeometryDescriptor &CW){
     assigned_cw->unAssign();
   }
   assigned_cw = &CW;
+  CW.setG4System(this);//link both ways
 
   char* argv[]={(char*)"dummy"};
 
@@ -156,7 +157,8 @@ void G4System::run_gui(){
   }
 }
 
-void G4System::run_batch(int nEvents,const std::string& partSpecies, double minEnergy, double maxEnergy){
+void G4System::run_batch(int nEvents,const std::string& partSpecies, double minEnergy, 
+double maxEnergy, std::string filename){
   check();
 
 
@@ -165,6 +167,7 @@ void G4System::run_batch(int nEvents,const std::string& partSpecies, double minE
     UImanager->ApplyCommand("/run/initialize");
     UImanager->ApplyCommand("/vis/disable");
     actionInitialization->setGeneratorProperties(minEnergy, maxEnergy, partSpec);
+    actionInitialization->setFileName(filename);
     runManager->BeamOn(nEvents);
 }