c++11 - Read csv column names in C++ -

i new object oriented programming. firstly, trying read following data structure csv file , parse through first line (header) , push strings vector. secondly, read customer information on first row (usa) , extract name , integer value(14400000). far, existing code read columns. however, there spaces within of strings , trim them.

+------------------------------------------------------+ |,abb llc,phil manu ,products north america inc.,mapn, | +------------------------------------------------------+ | usa-14400000,,,,                                     | | quantity,14155572,14435598,14298563,14311206         | | index,us-gc,eu-ht,as-ir,us-pt                        | | period(weeks),3,3,3,3                                | | cost,6278,5341,7394,7069                             | +------------------------------------------------------+ 

here code.

#include <iostream> #include <fstream> #include <sstream>  using namespace std;  void readtest() {   string filename = doe->scenariodir( ) + "/test.csv"; // read data   ifstream fin( filename );   if ( fin == null )   {     cout << "missing test.csv file." << endl;      exit(1);   }    cout << "\nreading file " << filename << endl;    vector<string> supplierslist;   string str, suppliername;    getline( fin, str );   stringstream linestr( str );   getline( linestr, suppliername,',' );    while (  linestr.good() )   {     getline( linestr, suppliername, ',' );     supplierslist.push_back(suppliername);   }     std::cout << supplierslist[0] << ' '; } 

and output : abb llc

any appreciated!

your code works designed. following line prints first element:

std::cout << supplierslist[0] << ' '; 

if you'd change follows:

for (auto &x: supplierslist)      std::cout << x << ' '; 

you'd obtain full list:

abb llc phil manu  products north america inc. mapn   

by way:

• you should replace if(fin==null) if(!fin)
• and should loop on read operation: while(getline( linestr, suppliername, ',' )) instead of while(linestr.good()) followed read you'd try process if it'd fail.

edit: how rid of spaces

if want rid of spaces, use copy_if() back_inserter() follows:

... string str, field; ... getline( linestr, field,',' );  while ( getline( linestr, field, ',' ) ) {     string suppliername;     copy_if(field.begin(), field.end(), back_inserter<string>(suppliername),[](char a){return !isspace(a);});     supplierslist.push_back(suppliername); } ... 

this give you:

abbllc philmanu productsnorthamericainc. mapn