Problems with changing the name of collectable string class in a root file

[etejedor]

Hi @bengy,

Can you try to delete the old “tag” by using TFile::Delete:

TFile::Delete a TObject from a directory

[quote]Q2. After closing and reopening the file the ls() changes and no directory is shown.[/quote] humm … f.Open("test.root", "READ");Does NOT affect the object ‘j’ because TFile::Open is a static function that allocates and return a new object. i.e. TFile *f2 TFile::Open("test.root", "READ"); f2->ls(); f2->Close();will work better. Cheers, Philippe.

Please also check the method documentation here:

https://root.cern.ch/doc/v612/classTFile.html#a1b1c78f1d20439291bb52f2217c382f7

Cheers,

Enric