Dear Philippe, I managed to solve my problem in a very simple way: I create a stand alone program, implementing the class which was using the TClonesArray in a compiled shared object. I mean that, without changing a line, the same code does work if compiled and used out from the ROOT working frame (i.e. if not implemented in a macro and interpreted by CINT as with .x) . I still not understand why... but many things happens as ROOT is executing. Maybe some crossover of memory which I could not manage. btw, thanks a lot! Tommaso On Fri, 17 Dec 2004, Philippe Canal wrote: > Hi Tommaso, > > From your description it is not clear what is going wrong. > The first thing you should try is to replace v->UncheckedAt by v->At to make > sure you are really reading allocated memory. > > Now there is no technical different between (strictly speaking): > TClonesArray *v = p.GettArray(); > And > TClonesArray *v; > v = p.GettArray(); > The difference I guess in that between the last 2 lines you have many other > thing going-on that may or may not affect the result (like going > out-of-scope, other unrelated memory over-write, etc.). > > The simpliest is for you to send a very small, complete example that > reproduces the problem. > > Cheers, > Philippe. > > -----Original Message----- > From: owner-roottalk@pcroot.cern.ch [mailto:owner-roottalk@pcroot.cern.ch] > On Behalf Of tommaso chiarusi > Sent: Friday, December 17, 2004 7:42 AM > To: Root Newsgroup > Subject: [ROOT] TClonesArray > > Dear Rooters, > Should it be stange the following? > > You have a member function GetArray() which yields a pointer to > TClonesArray. > > so, in the scope of some methods: > > TClonesArray *v = p.GettArray(); > Evento &te = *((Evento*) v->UncheckedAt(cont)); > > > It's Ok and the Evento-memory segment does exist and it is filled with right > things. While... > > TClonesArray *v; > v = p.GettArray(); > Evento &te = *((Evento*) v->UncheckedAt(cont)); > > It ISN'T ok, and the Evento-memory segment is completely random. > > > > What's happening? > > I need to use the second case, since the TClonesArray pointer v should be a > private data member of a class. > In particular I should organize such stuff as the following: > > TClonesArray *v; -> IN THE PRIVATE DATA MEMBER DECLARATION SCOPE > > v = p.GettArray(); -> IN THE CLASS CONSTRUCTOR DEFINITION > > Evento &te = *((Evento*) v->UncheckedAt(cont)); IN A MEMBER FUNCTION > > > Maybe I'm forgetting some stupid rule.... > Thanks a lot, > > Tommaso. > > P.S. > > System > > ROOT: Version 4.00/08 9 July 2004 > OS: Linux RH-9 > gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5) > > > > -- > ----------------------- > > Dr. Tommaso Chiarusi > > Dipartimento di Fisica > Universita' di Bologna > INFN. Sez. Bologna > > Tel +39.051.209.5234 > Fax +39.051.209.5269 > > ----------------------- > > > -- ----------------------- Dr. Tommaso Chiarusi Dipartimento di Fisica Universita' di Bologna INFN. Sez. Bologna Tel +39.051.209.5234 Fax +39.051.209.5269 -----------------------
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