C++文件系统操作6 - 跨平台实现查找指定文件夹下的特定文件

news2024/9/21 20:40:40

1. 关键词

C++ 文件系统操作查找指定文件夹下的特定文件跨平台

2. fileutil.h


#pragma once

#include <string>
#include <cstdio>
#include <cstdint>
#include "filetype.h"
#include "filepath.h"

namespace cutl
{

    /**
     * @brief The file guard class to manage the FILE pointer automatically.
     * file_guard object can close the FILE pointer automatically when his scope is exit.
     */
    class file_guard
    {
    public:
        /**
         * @brief Construct a new file guard object
         *
         * @param file the pointer of the FILE object
         */
        explicit file_guard(FILE *file);

        /**
         * @brief Destroy the file guard object
         *
         */
        ~file_guard();

        /**
         * @brief Get the FILE pointer.
         *
         * @return FILE*
         */
        FILE *getfd() const;

    private:
        FILE *file_;
    };

    /**
     * @brief Find all files in a directory by name.
     *
     * @param dirpath the filepath of the directory to be searched
     * @param name the name of the file to be found, substring match is supported.
     * @param recursive whether to search the whole directory recursively, default is false.
     * If true, means search the whole directory recursively, like the 'find' command.
     * @return filevec the vector of file_entity, filepaths in the directory.
     */
    filevec find_files(const filepath &dirpath, const std::string &name, bool recursive = false);

    /**
     * @brief Find all files in a directory by extension.
     *
     * @param dirpath the filepath of the directory to be searched
     * @param extension the extension of the file to be found, with dot, like ".txt".
     * @param recursive whether to search the whole directory recursively, default is false.
     * If true, means search the whole directory recursively, like the 'find' command.
     * @return filevec the vector of file_entity, filepaths in the directory.
     */
    filevec find_files_by_extension(const filepath &dirpath, const std::string &extension, bool recursive = false);

} // namespace cutl

3. fileutil.cpp

#include <cstdio>
#include <map>
#include <iostream>
#include <cstring>
#include <sys/stat.h>
#include "fileutil.h"
#include "inner/logger.h"
#include "inner/filesystem.h"
#include "strutil.h"

namespace cutl
{
    file_guard::file_guard(FILE *file)
        : file_(file)
    {
    }

    file_guard::~file_guard()
    {
        if (file_)
        {
            // CUTL_DEBUG("close file");
            int ret = fclose(file_);
            if (ret != 0)
            {
                CUTL_ERROR("fail to close file, ret" + std::to_string(ret));
            }
            file_ = nullptr;
        }
        // ROBOLOG_DCHECK(file_ == nullptr);
    }

    FILE *file_guard::getfd() const
    {
        return file_;
    }

    filevec find_files(const filepath &dirpath, const std::string &name, bool recursive)
    {
        filevec filelist = list_files(dirpath, filetype::all, recursive);
        filevec result;
        for (auto &file : filelist)
        {
            if (file.type == filetype::directory)
            {
                continue;
            }
            auto filename = cutl::path(file.filepath).basename();
            if (filename.find(name) != std::string::npos)
            {
                result.emplace_back(file);
            }
        }
        return result;
    }

    filevec find_files_by_extension(const filepath &dirpath, const std::string &extension, bool recursive)
    {
        filevec filelist = list_files(dirpath, filetype::all, recursive);
        filevec result;
        for (auto &file : filelist)
        {
            if (file.type == filetype::directory)
            {
                continue;
            }
            auto extname = cutl::path(file.filepath).extension();
            if (cutl::to_lower(extname) == cutl::to_lower(extension))
            {
                result.emplace_back(file);
            }
        }
        return result;
    }