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crash [message #20363]

Thu, 23 February 2017 00:57

Gianluigi Boca
Messages: 177
Registered: March 2004

first-grade participant

From: *pv.infn.it

Hi,
does anyone know why within the Init or Exec method of a class,
let's say in

sttmvdtracking/PndMixBackgroundEvents.cxx

class, the following very normal statements lead to an inexplicable
crash ?

TFile *f = new TFile("../dpm/digi_complete.root");
TTree * fTree = (TTree*) f->Get("cbmsim");
TClonesArray * fClone;
fTree->SetBranchAddress("MVDPixelDigis",&fClone);
fTree->GetEntry(5); // it crashes here

Note that other things like

fTree->Print()

for instance give a quite normal usual output. The file ../dpm/digi_complete.root
has been generated with the standard sim_complete.C and digi_complete.C
Macros in the trunk repository.

The crash doesn't happen if I do the same statements within the

root

interactive command.

Thanks in advance
Gianluigi

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Re: crash [message #20370 is a reply to message #20363]

Thu, 23 February 2017 21:01

Tobias Stockmanns
Messages: 489
Registered: May 2007

first-grade participant

From: *netcologne.de

Dear Gianluigi,

the problem is the line:

TClonesArray* fClone;

You do not allocate memory for the TClonesArray which causes the crash.
Replace it with:

TClonesArray* fClone = new TClonesArray("PndSdsDigiPixel");

Cheers,

Tobias

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