C++: Read CSV-file separated by ; AND \n [duplicate]

Answer 1

I recently had to read csv-data as well and stumbled upon the same 'problem'. Here's what I did:

1. Read in a full line with getline(csvread, s), this will read up to the first newline.
2. Split the string on every occurence of ;, I've used this StackOverflow answer as inspiration to split a string, the code is also listed below.

I didn't care much for performance as I only had to run this program once, I won't comment on the speed of this workaround.

Good luck!

Edit: apparently Boost offers code to split a string, that might be cleaner, consider the code below if you want to avoid Boost.

---

#include <string>
#include <sstream>
#include <vector>

// source: https://stackoverflow.com/a/236803/4841248

std::vector<std::string> &split(const std::string &s, char delim, std::vector<std::string> &elems) {
    std::stringstream ss(s);
    std::string item;
    while (std::getline(ss, item, delim)) {
        elems.push_back(item);
    }
    return elems;
}


std::vector<std::string> split(const std::string &s, char delim) {
    std::vector<std::string> elems;
    split(s, delim, elems);
    return elems;
}

Answer 2

try something like this:

std::vector<std::string> cells;
while (getline(csvread, s) ){
   boost::split(cells, s, boost::is_any_of(";"));
   ....
}

Answer 3

you can use a splitting function like :

std::vector<std::string> split(const std::string& source, const std::string& delimiter){
    std::vector<std::string> result;

    size_t last = 0;
    size_t next = 0;

    while ((next = source.find(delimiter, last)) != std::string::npos){ 
        result.push_back(source.substr(last, next - last));
        last = next + delimiter.length();
    } 
    result.push_back(source.substr(last));
    return result;
}

now simply:

std::vector<std::vector<std::string>> parsedCSV;
while (getline(csvread, s, '\n'))
{
parsedCSV.push_back(split(s,";"));
}

Answer 4

You should do the '\n' and ';' splitting separately:

while (getline(csvread, line, ';'))
{
    // in here, split line by ;
    std::vector<std::string> elems;
    boost::split(elems, line, boost::is_any_of(";"));

    // do something with elems
}