1.读取CSV文件

// 读取csv文件
void read_csv(const std::string& file_path) {std::cout<<"文件路径: "<< file_path<<"\n";std::ifstream csv_data(file_path, std::ios::in);std::string line;if (!csv_data.is_open()) {std::cout << "Error: failed to open file\n";std::exit(1);}std::istringstream sin;  // 将整行字符串读入到字符串流中std::vector<std::string> words;std::string word;std::vector<std::vector<double>> path_points;// 读取标题行std::getline(csv_data, line);// 读取数据while (std::getline(csv_data, line)) {sin.clear();sin.str(line);words.clear();std::vector<double> path_point;while (std::getline(sin, word, ',')) {  // 将字符串流sin中的字符读到word中，以字符'逗号'为分隔符double value = std::atof(word.c_str());path_point.push_back(value);}path_points.push_back(path_point);}csv_data.close();  // 关闭文件
}

2.写入CSV文件

void write_csv(const std::string& file_path) {std::cout << "写入路径为: " << file_path << "\n";std::ofstream out_file(file_path,std::ios::out);  // 默认通过iso::out方式进行写入，当文件不存在时会进行创建if (out_file.is_open()) { //判定文件是否打开// 写入标题行out_file << "x" << ',' << "y" << ',' << "heading" << ',' << "s" << ','<< "kappa" << ',' << "flag" << std::endl;// 写入10行数据for (int i = 0; i < 10; ++i) {out_file << std::to_string(i) << ',' << std::to_string(i) << ','<< std::to_string(i) << ',' << std::to_string(i) << ','<< std::to_string(i) << ',' << std::to_string(i) << std::endl;}out_file.close();}else{std::cout<<"文件无法打开\n";}}

3.向csv文件中追加内容

与第2部分基本相同，只不过是以iso::app方式打开，当文件不存在时会自动创建。

void app_csv(const std::string& file_path) {std::ofstream out_file(file_path, std::ios::app);if(out_file.is_open()){ //判断文件是否打开// 写入10行数据for (int i = 10; i < 20; ++i) {out_file << std::to_string(i) << ',' << std::to_string(i) << ','<< std::to_string(i) << ',' << std::to_string(i) << ','<< std::to_string(i) << ',' << std::to_string(i) << std::endl;}}else{std::cout<<"文件无法打开\n";}
}