Starting with version 5.32/00 it is possible to easily create a PAR file to read the content of data stored into a ROOT file. This is done via TFile::MakeProject, exploiting the fact that ROOT files are self-describing and contain enough information to read what is stored. The method MakeProject of TFile has been augmented with the possibility to store the relevant information in form of a PAR file. To get the PAR file just open the file in READ mode
root  TFile *f = TFile::Open("/path/to/myfile.root")and run MakeProject in this way:
root  f->MakeProject("/path/with/packages/mypack", "*", "par")This will create mypack.par under /path/with/packages. The created PAR file is ready to be used with PROOF.
The following creates the equivalent of tutorials/proof/event.par :
$ root -l root  TFile * f = TFile::Open("http://root.cern.ch/files/data/event_1.root") Warning in <:tclass>: no dictionary for class Event is available Warning in <:tclass>: no dictionary for class EventHeader is available Warning in <:tclass>: no dictionary for class Track is available root  f->MakeProject("packages/myevent", "*", "par") MakeProject has generated 3 classes in packages/myevent Files Makefile, Makefile.arch, PROOF-INF/BUILD.sh and PROOF-INF/SETUP.C have been generated under 'packages/myevent' myevent/ myevent/EventHeader.h myevent/Event.h myevent/myeventProjectInstances.h myevent/myeventProjectHeaders.h myevent/PROOF-INF/ myevent/PROOF-INF/BUILD.sh myevent/PROOF-INF/SETUP.C myevent/myeventLinkDef.h myevent/Makefile.arch myevent/Track.h myevent/Makefile myevent/myeventProjectSource.cxx Info in <:makeproject>: PAR file packages/myevent.par generated root  .q $ ls packages/ myevent myevent.par $ ls packages/myevent Event.h Makefile myeventLinkDef.h myeventProjectInstances.h PROOF-INF EventHeader.h Makefile.arch myeventProjectHeaders.h myeventProjectSource.cxx Track.h $ ls packages/myevent/PROOF-INF/ BUILD.sh SETUP.C