一、算法原理

在读取csv文件进行点云处理的时候，常常需要跳过表头，并且进行批量读取。本代码，将每行数据记录为一个数组，并将多个csv文件合并记录。
在使用中，需要自己修改想要提取的列数以及定义的参数。

二、代码实现

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
#include <cmath>
#include <iomanip>
#include <Eigen/Dense>

using namespace Eigen;

// 结构体用于存储CSV中的一行数据
struct CSVRow {
    std::string col1;
    std::string col2;
    std::string col3;
    std::string col4;
    std::string col5;
    std::string col6;
    std::string col7;
    std::string col8; 
    std::string col9;
    std::string col10;
    std::string col11;
    std::string col12;
    std::string col13;
    std::string col14;
    std::string col15;
    std::string col16;
    std::string col17;
    std::string col18;
    std::string col19;
    std::string col20;
    std::string col21;
    std::string col22;
    std::string col23;
    std::string col24;
    std::string col25;
};

// 读取CSV文件的指定列
std::vector<CSVRow> readCSVColumn(const std::string& filename) {
    std::vector<CSVRow> data;
    std::ifstream infile(filename);

    if (!infile) {
        std::cerr << "无法打开文件: " << filename << std::endl;
        return data;
    }

    // 跳过第一行
    std::string skipLine;
    std::getline(infile, skipLine);

    std::string line;
    while (std::getline(infile, line)) {
        std::istringstream iss(line);
        std::string col1, col2, col3, col4, col5, col6, col7, col8; 
        if (std::getline(iss, col1, ',') && std::getline(iss, col2, ',') &&
            std::getline(iss, col3, ',') && std::getline(iss, col4, ',') && std::getline(iss, col5, ',') &&
            std::getline(iss, col6, ',') && std::getline(iss, col7, ',') && std::getline(iss, col8, ',')) {
            std::string col9, col10, col11, col12, col13, col14, col15, col16, col17, col18, col19, col20, col21, col22, col23, col24, col25;
            std::getline(iss, col9, ',');
            std::getline(iss, col10, ',');
            std::getline(iss, col11, ',');
            std::getline(iss, col12, ',');
            std::getline(iss, col13, ',');
            std::getline(iss, col14, ',');
            std::getline(iss, col15, ',');
            std::getline(iss, col16, ',');
            std::getline(iss, col17, ',');
            std::getline(iss, col18, ',');
            std::getline(iss, col19, ',');
            std::getline(iss, col20, ',');
            std::getline(iss, col21, ',');
            std::getline(iss, col22, ',');
            std::getline(iss, col23, ',');
            std::getline(iss, col24, ',');
            std::getline(iss, col25, ',');

            data.push_back({ col1, col2, col3, col4, col5, col6, col7, col8, col9, col10, col11, col12, col13, col14, col15, col16, col17, col18, col19, col20, col21, col22, col23, col24, col25 });
        }
    }

    infile.close();
    return data;
}

int main() {
    std::vector<std::string> filenames = {
        "C:\\Users\\dell\\Desktop\\440882004003000100533.csv",
        "C:\\Users\\dell\\Desktop\\440882004003000100534.csv",
        //在此处添加需要处理的文件
    };

    std::vector<CSVRow> combinedData;
    for (const auto& filename : filenames) {
        std::vector<CSVRow> csvData = readCSVColumn(filename);
        combinedData.insert(combinedData.end(), csvData.begin(), csvData.end());
    }
    return 0;
}

三、注意事项

此代码只适用于读取csv文件，不涉及如何输出文件。