Hi Peter, I do not understand what you mean by "find all the events (keys)". Are you really writing a TTree? Could you send me a small root file featuring this problem. Could you send me the piece of code where you create the TTree and the TClonesArray branch and the read equivalent. Which version of Root are you using? which platform? Rene Brun Peter G. Jones wrote: > > Hi, > > I have created a TTree which is based on a single TClonesArray of > identical objects. I can open and interogate the resultant file to > find all the events (keys) in place, but when I try to read the first > complete event I get the following error. > > Error in <TBuffer::ReadObject>: object tag too large, I/O buffer corrupted > > I have not been able to find an explanation for this error. Could > someone enlighten me as to what the object tag is ? and what might > be the likely cause the error ? > > Thanks, > > Peter > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > Peter G. Jones Tel: (+44)(0)121 414 4677 > School of Physics and Astronomy FAX: (+44)(0)121 414 4719 > University of Birmingham E-mail: p.g.jones@bham.ac.uk > Birmingham, B15 2TT, UK > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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