|Message: Re: GetRadLen, write in ROOT file -> Seg Fault||Not Logged In (login)|
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Your code cannot work. There is one fundamental flaw that tells me that you do not grasp significant aspects of C++:
G4Step* step = new G4Step();
Ok, now you've got a pointer to such an object, but who do you think has put any informtion into this object? For example,
G4StepPoint* point1 = step->GetPreStepPoint(); G4Material* material1 = point1 ->GetMaterial();
who put a G4StepPoint* pointer into your 'step' object. This pointer is probably NULL and then you use it to retrieve material1. You can't do that with a NULL pointer.
I suspect that G4 may already allow you to do what you want via the commands:
see Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2010/04/20/11.30-12020-_control_matScan_.html