Hello, Is is possible to have a class (say X) inherit TDirectory and still be accessible as its class type (X) with TDirectory functionality when written to a TFile? I'm finding that once I close and reopen the file, the Class X object is gone and only the TDirectory portion remains. How should I approach this problem? // example //___________________ class X : public TDirectory { public: X() : TDirectory(); X(Text_t *name, Text_t *title) : TDirectory(name, title); virtual ~X(); void Hi(); ClassDef(X,1); } //____________________ void X::Hi() { printf("hello to you too\n"); } //___________________ the current keyboard layout is 437 ******************************************* * * * W E L C O M E to R O O T * * * * Version 1.03/09 16 December 1997 * * * * You are welcome to visit our Web site * * http://root.cern.ch * * * ******************************************* CINT/ROOT C/C++ Interpreter version 5.13.36, Nov 30 1997 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }. root [0] f = new TFile("e:/data/g2trace;3.root","recreate"); root[1] X *x = new X("myx","my X class"); root[2] f.ls() TFile** e:/data/g2trace;3.root TFile* e:/data/g2trace;3.root X* myx my X class KEY: TDirectory myx;1 myx root[3] x.Write(); root[4] f.Write(); TFile Writing Name=e:/data/g2trace;3.root Title= root[5] .q //__________________________________ the current keyboard layout is 437 ******************************************* * * * W E L C O M E to R O O T * * * * Version 1.03/09 16 December 1997 * * * * You are welcome to visit our Web site * * http://root.cern.ch * * * ******************************************* CINT/ROOT C/C++ Interpreter version 5.13.36, Nov 30 1997 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }. root [0] f = new TFile("e:/data/g2trace;3.root","update"); root[1] f.ls(); TFile** e:/data/g2trace;3.root TFile* e:/data/g2trace;3.root KEY: TDirectory myx;1 myx root[2] myx.Hi(); Error: No symbol myx.Hi() in current scope FILE:D:\TEMP\466 LINE:1 *** Interpreter error recovered *** William J Deninger deninger@uiuc.edu
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