Rene, just to be 100 % sure now, from you posts this should work: (if yes just asnwer yes to save time, if no please explain because it than cotradicts with your provious posts !) Class A does NOT deriver from TObject, does NOT define the ClassDef macros and has NO streamer. It HAS datamemebers which I do NOT want/need to write to disk. Class B:public A,TObject DOES deriver from TObject, DOES implement ClassDef, HAS a dictionary file,HAS data members which need to be written to disk. BObject->Write("NAME"); and BObject=(B*)SomeFile->Get("Name"); WILL work although base class does NOT deriver from TObject and has no streamer ! Joe
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