Hi there, I am using antlr for parsing the string. I use c++ version. my code is... strstream to_parse(char_pointer, strlen(char_pointer)+1); try { MyLexer lexer(to_parse); TokenBuffer buffer(lexer); MyParser parser(buffer); parser.parse(); }catch (exception&e ) { cout < < } The problem is it parses the string properly when string is correct. When some wrong data is given, it goes in to the consume() method and looks for EOF_TYPE and ultimately ends up in the infinite while loop. I don't know how to specify EOF_TYPE in a string.    More>>