my_commen_func.cpp

//读取文件路径下全部文件名称，并保存在vector中
#include "dirent.h"
#include <iostream>
#include <vector>
#include <sstream>
#include <string.h>
#include <fstream>
using namespace std;


/*
  @para: file_list: 用来保存文件名称的vector
  		 folder_path:  文件夹的路径
  @return: None

*/
void getFileList(std::vector<std::string> &file_list, std::string folder_path,
                 bool concate = true, bool verbose = false) {
  dirent *ptr;
  DIR *dir;
  file_list.clear();
  dir = opendir(folder_path.c_str());
  std::size_t pos;
  folder_path.find_last_of("/", pos);
  if (pos != (folder_path.size() - 1)) folder_path.push_back('/');

  while ((ptr = readdir(dir)) != NULL) {
    if (strcmp(ptr->d_name, ".") == 0 || strcmp(ptr->d_name, "..") == 0)
      continue;
    std::stringstream ss;
    if (concate)
      ss << folder_path << ptr->d_name;
    else {
      ss << ptr->d_name;
    }
    file_list.emplace_back(ss.str());
    if (verbose) {
      std::cout << ss.str() << std::endl;
    }
  }
  closedir(dir);
}

/**
读取txt文件夹中的数据,一行一行的读取
*/
void SplitString(std::string str, std::vector<std::string> &fields,
                 char separators, bool verbose = false) {
  std::istringstream sin(str);
  std::string field;
  while (std::getline(sin, field, separators)) {
    fields.push_back(field);
    if (verbose) {
      std::cout << field << "--";
    }
  }
  if (verbose) std::cout << std::endl;
}

void Readtxt(std::string file_path,std::vector<std::string> &fields,char separator) {
    std::fstream fin;
    fin.open(file_path.c_str(),std::ios::out);
    if(!fin.is_open())
    {
        ROS_ERROR("can't open file %s",file_path.c_str());
        return;
    }
    std::string line;
    while (std::getline(fin, line)) {
        SplitString(line, fields, separator);//将line一整句string按照分号切割成多个string并存储到fields中vector中;
    }
}