|Message: Re: Sigmentation fault||Not Logged In (login)|
Click on the Forum title, e.g. on the "Forums by Category" page, to read a sequence of postings to the Forum and its threads all in one page. If you are only interested in one thread or the thread following a specific posting, click the thread or the posting, which takes you to a smaller page, which contains only the part you are interested in and may be easier to navigate.
Messages are "chained" if there are only replies at the first level, i.e. 1/1.html, 1/1/1.html etc. In case of "chained" messages the message number is replaced by the icon and there is no indentation.
Inline: Display the subject line only or also the text of the posting(s); for the choice "All" the "Outline" choices are switched off.
|1||0||1||no text / full text of posting|
|2||1||All||text for level 1 only / text for All postings|
Outline: Choose the depth of the posting thread, successive toggle controls provide increasing detail.
|1||2||1||2 levels / 1 level (original posting)|
|2||3||2||3 levels / 2 levels|
|3||3||All||3 levels / all levels (all postings)|
I suggest that you check the value of the volume pointer that you get, to check that it is not null (ie zero).
Changing your code to read something like
G4VPhysicalVolume *pvol= aTrack->GetVolume(); G4String vol_name = (pvol!=0) pvol->GetName() ? "Null";
should allow you to take care of this case.
Generally it makes sense to protect your use of volumes (and other pointers) to make sure that they are not null. There are several reasons that a volume pointer could be null:
- the track has arrived at the boundary of the world volume - the process that created it wanted to create a secondary outside the current volume - the process that created it simply did not set it (actually it did not set the touchable which is the stack of volumes)
I hope that this helps to make clear the likely/potential problem, and allows you to solve it.
Best regards, John Apostolakis
P.S. Could you please add your affiliation to your HyperNews posting and mention your application area.
|Inline Depth:||Outline Depth:||Add message:|