C++文件系统操作1 - 跨平台实现文件的创建和删除

• 1. 关键词
• 2. fileutil.h
• 3. fileutil.cpp
• 4. filetype.h
• 5. filesystem_win.cpp
• 6. filesystem_unix.cpp
• 7. 源码地址

1. 关键词

C++ 文件系统操作 创建文件 删除文件 创建软连接 刪除软连接 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 Create a new file.** @param path the filepath of the new file to be created* @return true if the file is created successfully, false otherwise.*/bool createfile(const filepath &path);/*** @brief Create a symbolic link or shortcut.** @param referenece the real path referenced by the symbolic link or shortcut* @param filepath the filepath of the symbolic link or shortcut to be created* @return true if the symbolic link or shortcut is created successfully, false otherwise.*/bool createlink(const filepath &referenece, const filepath &filepath);/*** @brief Remove a regular file or symbolic link(shortcut on windows).** @param path the filepath of the file or symbolic link to be removed* @return true if the file or symbolic link is removed successfully, false otherwise.*/bool removefile(const filepath &path);} // 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_;}bool createfile(const filepath &path){auto dirPath = path.dirname();if (dirPath.empty()){CUTL_ERROR("invalid path: " + path.str());return false;}if (!cutl::path(dirPath).exists()){CUTL_ERROR("directory does not exist: " + dirPath);return false;}file_guard fg(fopen(path.str().c_str(), "w"));if (fg.getfd() == nullptr){CUTL_ERROR("fail to open file:" + path.str());return false;}int ret = fflush(fg.getfd());if (0 != ret){CUTL_ERROR("fail to flush file:" + path.str());return false;}if (!file_sync(fg.getfd())){CUTL_ERROR("file_sync failed for " + path.str());return false;}return true;}bool createlink(const filepath &referenece, const filepath &filepath){return file_createlink(referenece.str(), filepath.str());}bool removefile(const filepath &path){int ret = remove(path.str().c_str());if (ret != 0){CUTL_ERROR("remove " + path.str() + " error, ret:" + std::to_string(ret));return false;}return true;}

4. filetype.h

#include <vector>
#include <string>#pragma oncenamespace cutl
{// 创建软连接或快捷方式bool file_createlink(const std::string &referenece, const std::string &filepath);
} // namespace cutl

5. filesystem_win.cpp

#if defined(_WIN32) || defined(__WIN32__)#include <io.h>
#include <direct.h>
#include <Windows.h>
#include <stdlib.h>
#include "strutil.h"
#include "filesystem.h"
#include "logger.h"namespace cutl
{bool file_createlink(const std::string &referenece, const std::string &filepath){CUTL_ERROR("file_createlink() is not supported on Windows");return false;}
} // namespace cutl#endif // defined(_WIN32) || defined(__WIN32__)

6. filesystem_unix.cpp

#if defined(_WIN32) || defined(__WIN32__)
// do nothing
#else#include <unistd.h>
#include <sys/stat.h>
#include <dirent.h>
#include <stack>
#include <cstring>
#include <utime.h>
#include <stdlib.h>
#include <sys/time.h>
#include "filesystem.h"
#include "inner/logger.h"namespace cutl
{bool file_createlink(const std::string &referenece, const std::string &filepath){int ret = ::symlink(referenece.c_str(), filepath.c_str());if (ret != 0){CUTL_ERROR("symlink error. filepath:" + filepath + ", referenece:" + referenece + ", error:" + strerror(errno));return false;}return true;}
} // namespace cutl#endif // defined(_WIN32) || defined(__WIN32__)

7. 源码地址

更多详细代码，请查看本人写的C++ 通用工具库: common_util, 本项目已开源，代码简洁，且有详细的文档和Demo。

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