C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Vector of structs          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Neila Guest Posted: Thu Jan 29, 2004 1:18 am    Post subject: Vector of structs I have a file that includes several records each composed of a first name, last name and telephone number (each field separated with a space) which looks something like this aaa bbbb 123-678-9900 zzzx xxxx 999-999-9999 etc... I have a structure defined as struct user_rec { char fname[25] char lname[25] char telno[12] } What I want to do is have a vector of type user_rec that will store each record. The number of record in a file is unknow that is why I'm using dynamic allocation. I'm trying to treat each line of the file as a string and then tokenize it using the space as the delimiter //FileIN is my file that I opened //ptrToken is the tokenizer //v_Line is the array that will hold each record to be tokenized vector<user_rec> users_info; while (!FileIN.eof()) { //get each line and tokenize FileIN.getline(v_Line,C_LNG_LINE, 'n'); ptrToken= strtok ( v_Line, C_DELIM ); //Now I'm stuck here, how do I insert into a struct? and how do I move the //token to the next word in a record? users_info.fname.push_back(ptrToken); ptrToken = strtok ( NULL, C_DELIM ); users_info.lname.push_back(ptrToken); ptrToken = strtok ( NULL, C_DELIM ); users_info.telno.push_back(ptrToken); ptrToken = strtok ( NULL, C_DELIM ); } would there be any better solutions then strtok ? (Maybe read character by character?) thanks for any help Back to top Cy Edmunds Guest Posted: Thu Jan 29, 2004 2:35 am    Post subject: Re: Vector of structs "Neila" <nospam (AT) me (DOT) com> wrote Quote: I have a file that includes several records each composed of a first name, last name and telephone number (each field separated with a space) which looks something like this aaa bbbb 123-678-9900 zzzx xxxx 999-999-9999 etc... I have a structure defined as struct user_rec { char fname[25] char lname[25] char telno[12] } What I want to do is have a vector of type user_rec that will store each record. The number of record in a file is unknow that is why I'm using dynamic allocation. I'm trying to treat each line of the file as a string and then tokenize it using the space as the delimiter //FileIN is my file that I opened //ptrToken is the tokenizer //v_Line is the array that will hold each record to be tokenized vector<user_rec> users_info; while (!FileIN.eof()) { //get each line and tokenize FileIN.getline(v_Line,C_LNG_LINE, 'n'); ptrToken= strtok ( v_Line, C_DELIM ); //Now I'm stuck here, how do I insert into a struct? and how do I move the //token to the next word in a record? users_info.fname.push_back(ptrToken); ptrToken = strtok ( NULL, C_DELIM ); users_info.lname.push_back(ptrToken); ptrToken = strtok ( NULL, C_DELIM ); users_info.telno.push_back(ptrToken); ptrToken = strtok ( NULL, C_DELIM ); } would there be any better solutions then strtok ? (Maybe read character by character?) thanks for any help You might try this: #include <string> #include <iostream> #include <sstream> #include <vector> // use std::string rather than char[] struct user_rec { std::string fname; std::string lname; std::string telno; }; // define how to read a user_rec std::istream & operator >> (std::istream &istr, user_rec &ur) { istr >> ur.fname >> ur.lname >> ur.telno; return istr; } // define how to write a user_rec std::ostream & operator << (std::ostream &ostr, const user_rec &ur) { ostr << "first name: " << ur.fname << 'n'; ostr << "last name: " << ur.lname << 'n'; ostr << "telephone number: " << ur.telno << 'n'; return ostr; } void test_user_rec() { std::istringstream iss("aaa bbbb 123-678-9900nzzzx xxxx 999-999-9999n"); std::vector user_rec dummy; while (true) { iss >> dummy; if (!iss) break; // presumably out of data v.push_back(dummy); } for (std::vector<user_rec>::const_iterator i = v.begin(); i != v.end(); ++i) std::cout << *i; } Output is: first name: aaa last name: bbbb telephone number: 123-678-9900 first name: zzzx last name: xxxx telephone number: 999-999-9999 -- Cy http://home.rochester.rr.com/cyhome/ Back to top Neila Guest Posted: Thu Jan 29, 2004 5:40 pm    Post subject: Re: Vector of structs "Cy Edmunds" <cedmunds (AT) spamless (DOT) rochester.rr.com> wrote Quote: // use std::string rather than char[] struct user_rec { std::string fname; std::string lname; std::string telno; }; Unfortunalty I need to keep the structure of char And I'm a bit puzzled with this Quote: void test_user_rec() { std::istringstream iss("aaa bbbb 123-678-9900nzzzx xxxx 999-999-9999n"); std::vector<user_rec> v; user_rec dummy; how would I go about getting only one line of a file at a time and then innserting it into the structure and the structure into the vector? thanks anyway for your help Back to top Cy Edmunds Guest Posted: Thu Jan 29, 2004 10:56 pm    Post subject: Re: Vector of structs "Neila" <nospam (AT) me (DOT) com> wrote Quote: "Cy Edmunds" <cedmunds (AT) spamless (DOT) rochester.rr.com> wrote in message news:ck_Rb.61216$Fe1.50262 (AT) twister (DOT) nyroc.rr.com... // use std::string rather than char[] struct user_rec { std::string fname; std::string lname; std::string telno; }; Unfortunalty I need to keep the structure of char And I'm a bit puzzled with this void test_user_rec() { std::istringstream iss("aaa bbbb 123-678-9900nzzzx xxxx 999-999-9999n"); std::vector<user_rec> v; user_rec dummy; how would I go about getting only one line of a file at a time and then innserting it into the structure and the structure into the vector? What's a "line"? 'n' is just white space. Quote: thanks anyway for your help I used a hack (istringstream) to avoid having to type in an actual data file. Sorry if I confused you. Let's try it again: struct user_rec { char fname[25]; char lname[25]; char telno[12]; }; std::istream & operator >> (std::istream &istr, user_rec &ur) { std::string buffer; istr >> buffer; strncpy(ur.fname, buffer.c_str(), 25); istr >> buffer; strncpy(ur.lname, buffer.c_str(), 25); istr >> buffer; strncpy(ur.telno, buffer.c_str(), 12); return istr; } std::ostream & operator << (std::ostream &ostr, const user_rec &ur) { ostr << "first name: " << ur.fname << 'n'; ostr << "last name: " << ur.lname << 'n'; char buf[13]; // compensate for short telno field strncpy(buf, ur.telno, 12); buf[12] = ''; ostr << "telephone number: " << buf << 'n'; return ostr; } void test_user_rec() { std::fstream iss("data.txt"); std::vector user_rec dummy; while (true) { iss >> dummy; if (!iss) break; v.push_back(dummy); } iss.close(); for (std::vector<user_rec>::const_iterator i = v.begin(); i != v.end(); ++i) std::cout << *i; } The file "data.txt" contains: aaa bbbb 123-678-9900 zzzx xxxx 999-999-9999 Output is (once again): first name: aaa last name: bbbb telephone number: 123-678-9900 first name: zzzx last name: xxxx telephone number: 999-999-9999 -- Cy http://home.rochester.rr.com/cyhome/ Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.