c++ - 如何读取没有换行符 CRLF "\r\n"的 CSV 记录？

Question

我是 C++ 的新手，我一直在尝试弄清楚如何将 CSV 文件读入 vector 。到目前为止一切都很好，除了我不知道如何避免每条 CSV 记录末尾的换行符。

这是我的代码:

#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>

// stream input operator overloaded to read a list of CSV fields
std::istream &operator >> (std::istream &ins, std::vector<std::string> &record)
{
    record.clear();

    // read the entire line into a string
    std::string line;
    std::getline(ins, line);

    // using a stringstream to separate the fields out of the line
    std::stringstream ss(line);
    std::string field;

    while (std::getline(ss, field, ';'))
    {
        // add the converted field to the end of the record
        record.push_back(field);
    }
    return ins;
}

// stream input operator overloaded to read a list of CSV fields
std::istream &operator >> (std::istream &ins, std::vector<std::vector<std::string>> &data)
{
    data.clear();

    // add results from record into data
    std::vector<std::string> record;

    bool empty;
    while (ins >> record)
    {
        // check if line has a price
        for (unsigned i = 0; i < record.size(); i++)
        {
            std::stringstream ss(record[2]);
            int price;
            if (ss >> price)
            {
                empty = true;
            }
            else
            {
                empty = false;
            }
        }

        if (empty == true)
        {
            data.push_back(record);
        }
    }
    return ins;
}

int main()
{
    // bidemensional vector for storing the menu
    std::vector<std::vector<std::string>> data;

    // reading file into data
    std::ifstream infile("test.csv");
    infile >> data;

    // complain if theres an error
    if (!infile.eof())
    {
        std::cout << "File does not excist." << std::endl;
        return 1;
    }
    infile.close();


    for (unsigned m = 0; m < data.size(); m++)
    {
        for (unsigned n = 0; n < data[m].size(); n++)
        {
            std::string recordQry;
            recordQry += "'" + data[m][n] + "', ";

            std::cout << recordQry;
        }
        std::cout << std::endl;
    }
    return 0;
}

test.csv 包含:

CODE;OMSCHRIJVING; PRIJS ;EXTRA;SECTION
A1;Nasi of Bami a la China Garden; 12,00 ;ja;4
A2;Tjap Tjoy a la China Garden; 12,00 ;ja;1
A3;Tja Ka Fu voor twee personen; 22,50 ;ja;1

Answer 1

尝试:

while (std::getline(ss, field, ';'))
{
    // add the converted field to the end of the record
    record.push_back(field.erase(s.find('\r'));
}
//record.push_back(field.erase(s.find('\r'));
return ins;