[ROOT] Help with TFile

From: Olivas, Alexander Raymond (olivas@SLAC.stanford.edu)
Date: Wed Apr 09 2003 - 00:49:40 MEST 

I'm not sure if this is the correct place to post this question,
but here it goes.

I have many jobs currently creating quite a few root files.
I have the files numbered so I can read them using a simple
for loop.  However, some jobs haven't started yet and some 
are still running. I would like to read only the files that
exist and are closed.

I've tried something like...

  Int_t i_last=272;
  for(Int_t i=1;i<=i_last;i++){
    char fileName[60];
    sprintf(fileName,"$NTUPLE_DIR/B/BJpsiSkimFeb14%s_%d.root",name,i);
    if(g.Open(fileName)){
      TFile f(fileName);
      ksMassNoCuts->Add((TH1F*)f.Get("h1d3"));
    }
  }

g.Open(fileName) still returns true if the file does not exist.
I've searched through the root page and have had trouble finding
anything that will allow me to assess the state of a file without
explicity trying to open it.

Any help would be greatly appreciated.
Thanks,
Alex.

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