Hi Exaos, You are most likely using a distribution where the dictionary for std::string has not been built and/or not loaded yet. You would need to do: cd $ROOTSYS; gmake cintdlls and make sure to do (sometimes in the session): #include <string> Cheers, Philippe -----Original Message----- From: owner-roottalk@pcroot.cern.ch [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Exaos Lee Sent: Thursday, May 29, 2003 7:29 PM To: roottalk@pcroot.cern.ch Subject: [ROOT]std::ifstream error Dear rooter, I want to read data from a binary data file and an ascii file. My codes are below: ------- ... // Index file: ASCII format, each line containing one event filename // for processing. std::ifstream idx_in("event_index.txt",ios::in); std::ifstream evnt_in; // Kmax .evnt file stream std::string evnt_fn; // .evnt filename ... do { idx_in >> evnt_fn; // read a filename if(evnt_fn.isempty() && idx_in.eof()) break; evnt_in.open(evnt_fn,ios::in | ios::binary) ; ... } while(!idx_in.eof()); ------- When root reach this line: "idx_in >> evnt_fn;", it warns me: ======= Error: operator>> not defined for basic_ifstream<char,char_traits<char> > FILE:evnt2root.C LINE:67 *** Interpreter error recovered *** ======= What's wrong with my codes? Regards Exaos ################################################################# ################################################################# ################################################################# ##### ##### ##### ################################################################# ################################################################# #################################################################
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