Hi Masahiro,
You seem to have problems with your mail address(es) !
We have a chapter page 101 of the Users Guide discussing the question
of object ownership, including your example. Please read it.
In your short example below, you should not delete obj. obj has
already been deleted when closing the file.
Rene Brun
EasyLife@post.kek.jp wrote:
>
> 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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> > >
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