c++ 连续读取某个文件夹下面的多个文件

#include <iostream>
#include <fstream>
#include <ctime>
#include <cstdio>
#include <cstdlib>
#include <vector>
#include <string.h>

using namespace std;

vector< std::string> readtxt_name(string file)
{
    ifstream infile;
    infile.open(file.data());   
    cout<<"infile.is_open() is : "<<infile.is_open()<<endl;

    if(infile.is_open() ==0){
        cout<<"file not existed"<<endl;
    }
    vector< std::string> txt_name;
    string str;

    while(getline(infile,str))
    {
        txt_name.push_back(str);

    }
    cout<<txt_name.size()<<endl;
    infile.close();            
    return txt_name;
}



int main() {

    vector< std::string> txt_name;
    vector< std::string> final_path_txt_name;

    string path = "/home/data.txt";
    std::string str_temp;
    char ss[20] ;

    txt_name = readtxt_name(path);
    for(auto it = txt_name.begin(); it != txt_name.end(); ++it){

        str_temp = *it;
        strcpy(ss, str_temp.c_str());
        string path_final = "/home/";

        path_final = path_final + str_temp;
        std::cout<<" path_final is: "<<path_final<<std::endl;
        final_path_txt_name.push_back(path_final);
    }


    std::cout << "final_path_txt_name.size is :" <<final_path_txt_name.size()<< std::endl;



    return 0;
}