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I want to write parser for data I receive from a stock exchange server. There is no delimeter that define different fields in buffer I receive. However, it is provided in exchange spec's start and of each field. How should I write parser for data I recveive? I am new to parser consept and apprecite your suggestion. I am putting following example data string just to insist my scenario

Data my application recveive: 1001TXPASSWORDSESSION1N

I need to decode it(as per spec) as: Messate type: 1001 UserID:            TX password:        PASSWORD session:           SESSION data:               N

How should I be doing it?

#include <boost/spirit/include/qi.hpp> #include <boost/fusion/include/adapt_struct.hpp> using std::string; struct message { int type_; string userID_, password_, session_; char data_; }; BOOST_FUSION_ADAPT_STRUCT ( message, (int, type_) (string, userID_) (string, password_) (string, session_) (char, data_) ) int main() { namespace qi = boost::spirit::qi; using qi::char_; using qi::repeat; string in = "1001TXPASSWORDSESSION1N"; message out; bool res = qi::parse(in.begin(), in.end(), qi::int_ >> repeat(2)[char_] >> repeat(8)[char_] >> repeat(8)[char_] >> char_, out); }