使用C++读取csv文件

0.标准（C++11)

1.代码结构

2.Data.h文件

/**
 *@Author:FlowLiver
 *@Time: 2021/2/23
 *@From http://...
 *@ForUse happy
 */


#ifndef CPPPRJ_DATA_H
#define CPPPRJ_DATA_H

#include <string>
#include <utility>

class Data {
private:
    std::string _name;
    std::string _age;
    std::string _gender;

    

public:
    const std::string &getName() const;

    Data &setName(const std::string &name);

    const std::string &getAge() const;

    Data &setAge(const std::string &age);

    const std::string &getGender() const;

    Data &setGender(const std::string &gender);

    void print_info();

    ~Data() = default;

    Data() = default;
    Data(std::string name, std::string age, std::string gender)
            : _age(std::move(age)),
              _gender(std::move(gender)),
              _name(std::move(name)) {

    }
};


#endif //CPPPRJ_DATA_H

3.Data.cpp文件

/**
 *@Author:FlowLiver
 *@Time: 2021/2/23
 *@From http://...
 *@ForUse happy
 */


#include "Data.h"
#include <iostream>

const std::string &Data::getGender() const {
    return _gender;
}

const std::string &Data::getName() const {
    return _name;
}


Data &Data::setGender(const std::string &gender) {
    _gender = gender;
    return *this;
}


Data &Data::setName(const std::string &name) {
    _name = name;
    return *this;
}

const std::string &Data::getAge() const {
    return _age;
}

Data &Data::setAge(const std::string &age) {
    _age = age;
    return *this;
}

void Data::print_info() {
    std::cout << "name is :" << _name
              << "\tage is :" << _age
              << "\tgender is :" << _gender
              << std::endl;
}

3.数据源文件

张三,22岁,男
李四,23岁,女
陈六,23岁,女

4.main.cpp文件

#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <sstream>
#include "Data.h"

using namespace std;

bool readFile(const string &, vector<Data> &, char, int);

int main(int argc, char **argv) {
    vector<Data> dataArray;
    //csv文件有3行,sum=3
    if (!readFile("E:/files/codesrc/Clion/cppPrj/mx.csv", dataArray, ',', 3)) {
        cout << "read File fail!" << endl;
    }
    for (auto &data : dataArray) {
        data.print_info();
    }
}

bool readFile(const string &str, vector<Data> &dataArray, char flag, int sum) {
    ifstream inFile(str, ios::in);
    string line;
    if (!inFile.is_open()) {
        cout << "open file fail......" << endl;
        return false;
    }
    vector<string> data_str;
    int count = 0;
    while (getline(inFile, line) && count != sum) {
        Data data;
        data_str.clear();
        stringstream ss(line);
        string strIem;
        while (getline(ss, strIem, flag)) {
            data_str.emplace_back(strIem);
            // cout<<strIem<<"******"<<endl;
        }
        cout << data_str[0] << "******" << endl;
        data.setName(data_str[0])
                .setAge(data_str[1])
                .setGender(data_str[2]);
        cout << data.getName() << "-------" << endl;
        dataArray.emplace_back(data);
        ++count;
    }
    return true;
}

已完成

---

以下已废弃

1.代码1如下

//FileRead.h
//
// Created by hhlt on 2020/1/6.
//from file of ".csv" to array by C++
//
#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <sstream>

#ifndef UNTITLED1_FILEREAD_H
#define UNTITLED1_FILEREAD_H

using namespace std;
class FileRead{

private:
    vector<vector<string>> strArray;
    string str="";

public:
    FileRead(string temp) :str(temp){
    }

  bool read_file(){
        ifstream inFile(str, ios::in);
        string lineStr;
        char flag=';';
        if(inFile.fail()){
            cout <<"Read files fail....."<<endl;
            return false;
        }

        while (getline(inFile, lineStr)) {
            stringstream ss(lineStr);
            string str;
            vector<string> lineArray;
            // cut apart by flag
            while (getline(ss, str, flag))
                lineArray.push_back(str);
            strArray.push_back(lineArray);
        }
      return true;
    }



    void show_str_array(int row,int col){
        if(!read_file()){
            cout<<"No array!"<<endl;
            cout<<"print array fail!"<<endl;
            return;
        }
            vector<string>::iterator it;
            vector<vector<string>>::iterator iter;
            vector<string> vec_tmp;
            for(iter=strArray.begin()+row; iter != strArray.end(); iter++)
            {
                vec_tmp = *iter;
                for(it = vec_tmp.begin()+col; it != vec_tmp.end(); it++)
                    cout << *it <<"\t";
                cout << endl;
            }
        cout<<endl<<"print array success !"<<endl;
    }

    //another way to show strArray
    void show_str_array_2(int row,int col){

        //from row and col to show strArray
        for (int i = row; i <strArray.size() ; ++i) {
            for (int j = col; j <strArray[0].size() ; ++j) {
                cout<<strArray[i][j]    <<"\t"    ;    }
            cout<<endl;
        }
    }
};

#endif //UNTITLED1_FILEREAD_H

2.代码2如下

//main.app
#include "FileRead.h"
int main() {
    FileRead fr("C:/student-mat.csv");
    fr.show_str_array(1,2);  //from 1 row and 2 col to show
    return 0;
}