Masahiro Sugaya---------------------------
Address: 1-1 Oho, Tsukuba, Ibaraki 305-0801 Japan
Office: 0298-79-6123
Mail: sugayam@post.kek.jp
From: Rene Brun <Rene.Brun@cern.ch>
Subject: Re: [ROOT] reading / writing object to disk
Date: Sun, 25 Nov 2001 19:35:32 +0100 (MET)
Message-ID: <Pine.LNX.4.04.10111251933260.25631-100000@pcbrun.cern.ch>
Hi rooters !!
I have a question.
When we write a program compiling with the root library and persist
the TObject with TFile::Write method, I don't know who has the remote
ownership and duty to delete of the TObject.
I mean I wonder if it is necessary to delete the TObject in the next code.
#include <TFile.h>
#include <Myclass.h>
#include <TROOT.h>
TROOT root("myapp","myapp");
int main(){
TFile f("joe.root","recreate");
Myclass *obj = new Myclass;
obj->Write("aname");
f.Write();
f.Close();
delete obj; <- Is this line needed ?
return 0; ^^^^^^^^^^^^^^^^^^^^^
}
> Hi Joe,
>
> To write an object of class Myclass to a file, do:
> TFile f("joe.root","recreate");
> Myclass *obj = new Myclass;
> obj->Write("aname");
> f.Close();
>
> To read an object from a file:
> TFile f("joe.root");
> Myclass *obj = (Myclass*)f.Get("aname");
>
> Rene Brun
>
>
> On Sun, 25 Nov 2001, joe robe wrote:
>
> > Hi rooters,
> >
> > just try to understand TFILE.
> >
> > I created a small testclass (with ClassImp etc macros
> > and creating dict. file and are able to write this to
> > disk.
> >
> > All I see is the only data member the class has.
> >
> > I just dont understand yet how to save and retrieve my
> > WHOLE class to/from disk. Is that not possible ?? I
> > have classes with huge data arrays which are filled
> > after doing some calculations. I just want to save and
> > later retrieve this COMPLETE state of the object with
> > all its datamebers, objects etc.
> >
> > Is there a simple way to do that ??
> >
> > Thanks
> >
> > Joe
> >
> >
> >
> >
> > __________________________________________________
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