C++读写文件

利用 #include 文件输入输出流读写文件

#include <iostream>
#include <fstream>
#include <opencv2/highgui.hpp>
#include <opencv2/opencv.hpp>
#include <string>
using namespace std;

int main() {
  // 文件地址
  std::string base_filepath = "../data/";
  // 读文件
  std::ifstream ifs;
  ifs.open(base_filepath + "pose_data.txt", ios::in);
  vector<cv::Point2f> pose_points;
  float x_, y_;
  char z_;
  while (ifs >> x_ && ifs >> z_ && ifs >> y_) {
    cout << x_ << "," << y_ << endl;
    pose_points.push_back(cv::Point2f(x_, y_));
  }
  ifs.close();

  // 写文件
  std::ofstream ofs;
  std::string pose_file = "pose_data_copy.txt";
  ofs.open(base_filepath + pose_file, ios::out);
  for (int i = 0; i < pose_points.size(); i++) {
    ofs << pose_points[i].x << "," << pose_points[i].y << endl;
  }
  ofs.close();

  return 0;
}