Hi ROOTers, I have a small script that chains a user defined set of files together, with the chain then being processed with code generated by MakeSelector. The basic process is: root [4] MakeChain() root [5] EventCh->Process("TestSelec.C") Whilst this works well (I can remake the chain and reprocess without any problem), I have two questions. Firstly, each call to EventCh->Process() , whether using the same chain again or creating a new one, creates a new TSelector object (visible in gObjectTable) which I don't seem to be able to access to delete before remaking the chain; is there any way to delete this before reprocessing the chain? I assume that the TSelector object created is owned by TChain or TTreePlayer, so I would have though that it would be automatically deleted when I delete and remake the chain, but it doesn't seem to be. Secondly, I need the chain to be available outside of MakeChain(), and the only way to do this seems to be to define a global pointer to the chain outside of MakeChain(): TChain *EventCh; void MakeChain() { ..... } I note from the ROOTtalk mailing list that there was a proposal to give TChain a 'name' so that it could be retrieved from gDirectory. http://root.cern.ch/root/roottalk/roottalk98/0651.html Was this implemented, as there doesn't seem to be anything in the documentation on TChain that suggests it was. I'm using ROOT v3.02/07 on a Linux PC with RH7.1. Thanks, Ben Morgan. -- ------------------------------------------------------------------------------- Mr. Ben Morgan Postgraduate Student University of Sheffield Department of Physics & Astronomy Hicks Building Hounsfield Road Sheffield S3 7RH -------------------------------------------------------------------------------
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