c++如何压缩文件夹

在C++中，压缩文件夹通常需要使用第三方库，例如 zlib、minizip 或者 libarchive。以下是一个使用 minizip 库的示例，演示如何压缩文件夹及其内容：

首先，确保已经安装了 minizip 库。在 Ubuntu 系统上，可以使用以下命令安装：

sudo apt-get install libminizip-dev

接下来，编写一个 C++ 程序来压缩文件夹：

#include<iostream>
#include<string>
#include<vector>
#include <dirent.h>
#include <sys/stat.h>
#include "mz_compat.h"

bool is_directory(const std::string &path) {
    struct stat st;
    if (stat(path.c_str(), &st) == 0 && S_ISDIR(st.st_mode)) {
        return true;
    }
    return false;
}

std::vector<std::string> list_files(const std::string &folder) {
    std::vector<std::string> files;
    DIR *dir = opendir(folder.c_str());
    if (dir != nullptr) {
        dirent *entry;
        while ((entry = readdir(dir)) != nullptr) {
            if (entry->d_name[0] != '.') {
                std::string path = folder + "/" + entry->d_name;
                if (is_directory(path)) {
                    auto sub_files = list_files(path);
                    files.insert(files.end(), sub_files.begin(), sub_files.end());
                } else {
                    files.push_back(path);
                }
            }
        }
        closedir(dir);
    }
    return files;
}

int compress_folder(const std::string &input_folder, const std::string &output_file) {
    zipFile zf = zipOpen64(output_file.c_str(), APPEND_STATUS_CREATE);
    if (zf == nullptr) {
        std::cerr << "Failed to create zip file: "<< output_file<< std::endl;
        return -1;
    }

    auto files = list_files(input_folder);
    for (const auto &file : files) {
        zip_fileinfo file_info = {};
        int err = zipOpenNewFileInZip4_64(zf, file.substr(input_folder.length() + 1).c_str(), &file_info,
                                          nullptr, 0, nullptr, 0, nullptr, Z_DEFLATED, Z_DEFAULT_COMPRESSION, 0,
                                          -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY, nullptr, 0, 0, 0);
        if (err != ZIP_OK) {
            std::cerr << "Failed to open file in zip: "<< file<< std::endl;
            zipClose(zf, nullptr);
            return -1;
        }

        FILE *f = fopen(file.c_str(), "rb");
        if (f == nullptr) {
            std::cerr << "Failed to open file: "<< file<< std::endl;
            zipCloseFileInZip(zf);
            zipClose(zf, nullptr);
            return -1;
        }

        char buffer[4096];
        size_t read_size;
        while ((read_size = fread(buffer, 1, sizeof(buffer), f)) > 0) {
            err = zipWriteInFileInZip(zf, buffer, static_cast<unsigned int>(read_size));
            if (err < 0) {
                std::cerr << "Failed to write file to zip: "<< file<< std::endl;
                fclose(f);
                zipCloseFileInZip(zf);
                zipClose(zf, nullptr);
                return -1;
            }
        }

        fclose(f);
        zipCloseFileInZip(zf);
    }

    zipClose(zf, nullptr);
    return 0;
}

int main() {
    std::string input_folder = "/path/to/input/folder";
    std::string output_file = "/path/to/output/file.zip";

    int result = compress_folder(input_folder, output_file);
    if (result == 0) {
        std::cout << "Folder successfully compressed!"<< std::endl;
    } else {
        std::cerr << "Failed to compress folder."<< std::endl;
    }

    return result;
}

这个程序首先递归地列出文件夹中的所有文件，然后使用 minizip 库将这些文件添加到压缩文件中。请注意，您需要根据实际情况修改 input_folder 和 output_file 变量的值。