只从输入目录读取.txt文件，然后将所有内容放入C++中的一个数组中

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <filesystem>

std::vector<std::string> readTxtFilesFromDirectory(const std::string& directoryPath) {
    std::vector<std::string> contentArray;

    for (const auto& entry : std::filesystem::directory_iterator(directoryPath)) {
        if (entry.path().extension() == ".txt") {
            std::ifstream file(entry.path());
            std::string line;

            while (std::getline(file, line)) {
                contentArray.push_back(line);
            }

            file.close();
        }
    }

    return contentArray;
}

int main() {
    std::string directoryPath = "输入目录的路径";
    std::vector<std::string> contentArray = readTxtFilesFromDirectory(directoryPath);

    for (const auto& content : contentArray) {
        std::cout << content << std::endl;
    }

    return 0;
}