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• 1. 关键词
• 2. filesystem.h
• 3. filepath.cpp
• 6. 测试代码
• 7. 运行结果
• 8. 源码地址

1. 关键词

关键词：

C++ 文件路径处理 路径拼接 获取父目录的路径 获取文件名 获取拓展名 跨平台

应用场景：

• 路径的拼接
• 路径的解析

2. filesystem.h

#pragma once#include <string>
#include <iostream>
#include <cstdio>
#include "filetype.h"namespace cutl
{/*** @brief The class for file path operations.**/class filepath{public:/*** @brief Construct a new filepath object** @param path file path string*/filepath(const std::string &path);/*** @brief Construct a new filepath object by copy** @param other other filepath object*/filepath(const filepath &other);/*** @brief Assign operator, assign a new filepath object by copy** @param other other filepath object* @return filepath& the reference of the current filepath object*/filepath &operator=(const filepath &other);/*** @brief Destroy the filepath object**/~filepath() = default;public:/*** @brief Get the path separator of the current os platform.** @return the path separator*/static char separator();/*** @brief Get the string of the filepath.** @return the filepath*/std::string str() const;/*** @brief Join the current filepath with a new filename.** @param filename the filename to be joined* @return the new filepath object*/filepath join(const std::string &filename) const;/*** @brief Get the parent directory of the filepath.** @return parent directory path*/std::string dirname() const;/*** @brief Get the filename or directory name of the filepath.** @return filename or directory name*/std::string basename() const;/*** @brief Get the extension of the filepath.** @return extension with dot*/std::string extension() const;private:std::string filepath_;};/*** @brief Define the output stream operator for filepath object.** @param os the std::ostream object* @param fp the filepath object to be output* @return std::ostream& the reference of the std::ostream object after outputing the filepath object.*/std::ostream &operator<<(std::ostream &os, const filepath &fp);/*** @brief Create a filepath object from a string.** @param path file path string* @return filepath object*/filepath path(const std::string &path);} // namespace cutl

3. filepath.cpp

#include "filepath.h"
#include "inner/logger.h"
#include "inner/filesystem.h"
#include "strutil.h"
#include "sysutil.h"namespace cutl
{static constexpr char win_separator = '\\';static constexpr char unix_separator = '/';void fixpath(std::string &path){if (win_separator == filepath::separator()){for (size_t i = 0; i < path.size(); i++){if (path[i] == unix_separator){path[i] = win_separator;}}}else if (unix_separator == filepath::separator()){for (size_t i = 0; i < path.size(); i++){if (path[i] == win_separator){path[i] = unix_separator;}}}else{// do nothing}while (path.empty() || path.back() == filepath::separator()){path.pop_back();}}filepath::filepath(const std::string &path){filepath_ = path;fixpath(filepath_);}filepath::filepath(const filepath &other){filepath_ = other.filepath_;}filepath &filepath::operator=(const filepath &other){this->filepath_ = other.filepath_;return *this;}char filepath::separator(){
#if defined(_WIN32) || defined(__WIN32__)return win_separator;
#elsereturn unix_separator;
#endif}std::string filepath::str() const{return filepath_;}filepath filepath::join(const std::string &filename) const{std::string path = filepath_ + separator() + filename;return filepath(path);}std::string filepath::dirname() const{auto index = filepath_.find_last_of(separator());if (index == std::string::npos){return "";}return filepath_.substr(0, index);}std::string filepath::basename() const{auto index = filepath_.find_last_of(separator());// auto len = filepath_.length() - index - 1;if (index == std::string::npos){return filepath_;}return filepath_.substr(index + 1);}std::string filepath::extension() const{auto pos = filepath_.find_last_of('.');if (pos == std::string::npos){return "";}return filepath_.substr(pos);}std::ostream &operator<<(std::ostream &os, const filepath &fp){os << fp.str();return os;}filepath path(const std::string &path){return filepath(path);}
} // namespace cutl

6. 测试代码

#include "common.hpp"
#include "fileutil.h"void TestJoin()
{PrintSubTitle("TestJoin");auto path1 = cutl::path("/Users/spencer/workspace/common_util/src/usage_demo");auto path2 = path1.join("filepath.hpp");std::cout << "path1: " << path1 << std::endl;std::cout << "path2: " << path2 << std::endl;
}void TestDirnameBasename()
{PrintSubTitle("TestDirnameBasename");auto path1 = cutl::path("/Users/spencer/workspace/common_util/src/usage_demo/filepath.hpp");std::cout << "path1: " << path1 << std::endl;std::cout << "dirname: " << path1.dirname() << std::endl;std::cout << "basename: " << path1.basename() << std::endl;auto path2 = cutl::path("/Users/spencer/workspace/common_util/src/usage_demo");std::cout << "path2: " << path2 << std::endl;std::cout << "dirname: " << path2.dirname() << std::endl;std::cout << "basename: " << path2.basename() << std::endl;auto path3 = cutl::path("filepath.hpp");std::cout << "path3: " << path3 << std::endl;std::cout << "dirname: " << path3.dirname() << std::endl;std::cout << "basename: " << path3.basename() << std::endl;
}void TestExtenstion()
{PrintSubTitle("TestExtenstion");auto path1 = cutl::path("/Users/spencer/workspace/common_util/src/usage_demo/filepath.hpp");std::cout << "path1: " << path1 << ", extension: " << path1.extension() << std::endl;auto path2 = cutl::path("/Users/spencer/workspace/common_util/src/usage_demo/filepath");std::cout << "path2: " << path2 << ", extension: " << path2.extension() << std::endl;
}

7. 运行结果

----------------------------------------------TestJoin----------------------------------------------
path1: /Users/spencer/workspace/common_util/src/usage_demo
path2: /Users/spencer/workspace/common_util/src/usage_demo/filepath.hpp
----------------------------------------TestDirnameBasename-----------------------------------------
path1: /Users/spencer/workspace/common_util/src/usage_demo/filepath.hpp
dirname: /Users/spencer/workspace/common_util/src/usage_demo
basename: filepath.hpp
path2: /Users/spencer/workspace/common_util/src/usage_demo
dirname: /Users/spencer/workspace/common_util/src
basename: usage_demo
path3: filepath.hpp
dirname: 
basename: filepath.hpp
-------------------------------------------TestExtenstion-------------------------------------------
path1: /Users/spencer/workspace/common_util/src/usage_demo/filepath.hpp, extension: .hpp
path2: /Users/spencer/workspace/common_util/src/usage_demo/filepath, extension: 

8. 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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