Re: Which objects are stored by TFile::Write()?

Fons Rademakers (Fons.Rademakers@cern.ch)
Fri, 30 May 1997 18:23:46 +0200

better use TObject::AppendDirectory().
This also has the advantage that it adds the object to the
current directory, while file->GetList()->Add(obj)
adds the object to the file's top level directory.
Therefore just do:
obj->AppendDirectory();

-- Fons

Rene Brun wrote:
>
> TFile::Write() writes all the objects entered into the list
> of objects in memory associated with this file.
> Assume TFile *file:
> the file object has a list(TList) of objects that you can find at
> TList *list = file->GetList();
> By default, TH1 objects and TTree objects are automatically inserted
> in this list when these objects are created.
> TFile::Write scans all the objects in this list and for each object
> executes obj->Write.
> You can insert your own objects in this list if you want with a
> statement like
> file->GetList()->Add(object);
> and your object will be automatically saved by TFile::Write.
> Note that this is only convenient for objects derived from TNamed,
> such as TH1, TTree, TF1.
>
> Rene Brun

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