Hi, I am trying to figure out how to write Geant4 output to a root tree. I have created a test program (linked with our G4 program, however) which follows the "Event" example program identically. The only differences are: a) The object I am trying to write (derived from TObject) contains only two Int_t member variables rather than the complicated Event object in the example. b) I am not creating any histograms, just a single tree with a single branch. I have tried both setting of the split variable when creating the branch. Everything seems to go fine until I call TFile::Write() at the end of my job (i.e. the root file creation, tree and branch creation and tree filling give no problems; I checked that my class's Streamer function is being called). When I call TFile::Write() I get the error message: <CustomReAlloc2>: passed oldsize 1032, should be 327811 followed by an access violation which crashes the program. As far as I can tell, I am doing everything identically to the Event example program (which runs fine). I've tried a lot of different variations but can't avoid this error. Not calling TFile::Write and just closing the file results in no crash but an empty file (which isn't a huge surprise, I guess). This error seems to be coming from somewhere deep with the root libraries - can anyone provide some clue as to what the problem could be? I'm using root 2.25.1 on Win2K. Thanks, Dave dcasper@uci.edu
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