Dear all,
in my program I have a memory-resident TTree, created before any TFile object; in this particular application I do not expect to have any memory issue and things appera to run smoothly.
The problems begin when I want to save my acquisition. What I do is:
TFile *output_file = new TFile(fileName,"RECREATE");
output_file->cd();
datatree->Write();
datatree->SetDirectory(0);
output_file->Close();
When I do this the first time after the TTree has been filled, everything goes fine and the file is OK.
If I do this one more time, this new file is corrupted and the data unreadable. I can fill the TTree with a new acquisition and then save it, but only on one single file.
What am I missing?