Delete TFile doesn't work. SysError in <TFile::TFile>: file ~~.root can not be opened for reading (Too many open files)

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Question from this post:

Too many open files

Dear Rooters, I am writing a macro where I wish to read histograms from 1000 files and add them together. I open each file at the time in a loop using: TFile *myFile = new TFile(); myFile->Open(fileName,“read”); From the file I copy two histograms (I don’t think this is relevant but) using the ROOT feature that whenever a file is opened you automatically enter this file: h_Ptmp = new TH1F(*h_primaryElectronFluenceSpectrum); h_Stmp = new TH1F(*h_scatterElectronFluenceSpectrum); Finally I c…

How did TH1::AddDirectory(kFALSE) help?
Furthermore,
TFile *file = TFile::Open(filename.c_str());
yields segment fault whereas
file = new TFile( filename.c_str() , “read”);
does not, if the root file exists. The constructor gives me a chance to check for null pointer before crashing.