std::filesystem::path::c_str, std::filesystem::path::native, std::filesystem::path::operator string_type()

 

C++

编译器支持

独立和托管

语言

标准库

标准库头文件

命名要求

功能测试宏 (C++20)

语言支持库

概念库 (C++20)

元编程库 (C++11)

诊断库

通用实用程序库

字符串库

容器库

迭代器库

范围库 (C++20)

算法库

数值库

本地化库

输入/输出库

文件系统库 (C++17)

正则表达式库 (C++11)

并发支持库 (C++11)

执行支持库 (C++26)

技术规范

符号索引

外部库

 

文件系统库

类
filesystem::path filesystem::filesystem_error filesystem::directory_entry filesystem::directory_iterator filesystem::recursive_directory_iterator      filesystem::file_status	filesystem::space_info filesystem::file_type filesystem::perms filesystem::perm_options filesystem::copy_options filesystem::directory_options filesystem::file_time_type
函数
filesystem::absolute filesystem::canonicalfilesystem::weakly_canonical filesystem::relativefilesystem::proximate filesystem::copy filesystem::copy_file filesystem::copy_symlink filesystem::create_directory filesystem::create_directories filesystem::create_hard_link filesystem::create_symlink filesystem::create_directory_symlink filesystem::current_path	filesystem::exists filesystem::equivalent filesystem::file_size filesystem::hard_link_count filesystem::last_write_time filesystem::permissions filesystem::read_symlink filesystem::remove filesystem::remove_all filesystem::rename filesystem::resize_file filesystem::space filesystem::status filesystem::symlink_status filesystem::temp_directory_path
文件类型
filesystem::is_block_file filesystem::is_character_file filesystem::is_directory filesystem::is_empty filesystem::status_known	filesystem::is_fifo filesystem::is_other filesystem::is_regular_file filesystem::is_socket filesystem::is_symlink

 

std::filesystem::path

常量
path::native_formatpath::generic_formatpath::auto_format
成员函数
path::path path::~path path::operator= path::assign path::appendpath::operator/= path::concatpath::operator+= path::clear path::make_preferred path::remove_filename path::replace_filename path::replace_extension      path::swap path::compare path::beginpath::end	path::c_strpath::nativepath::operator string_type path::stringpath::u8stringpath::u16stringpath::u32stringpath::wstring path::generic_stringpath::generic_u8stringpath::generic_u16stringpath::generic_u32stringpath::generic_wstring path::lexically_normalpath::lexically_relativepath::lexically_proximate
路径分解
path::root_name path::root_directory path::root_path path::relative_path path::parent_path path::filename path::stem path::extension path::empty	path::has_root_pathpath::has_root_namepath::has_root_directorypath::has_relative_pathpath::has_parent_pathpath::has_filenamepath::has_stempath::has_extension path::is_absolutepath::is_relative
非成员函数
operator==operator!=operator<operator<=operator>operator>=operator<=> (直到 C++20)(直到 C++20)(直到 C++20)(直到 C++20)(直到 C++20)(C++20)	operator/ operator<<operator>> swap(std::filesystem::path) hash_value u8path
辅助类
hash<std::filesystem::path>
formatter<std::filesystem::path> (C++26)

 

const value_type* c_str() const noexcept;	(1)	(自 C++17 起)
const string_type& native() const noexcept;	(2)	(自 C++17 起)
operator string_type() const;	(3)	(自 C++17 起)

访问作为字符字符串的本地路径名。

1) 等同于 native().c_str().

2) 通过引用返回路径名的本地格式表示。

3) 通过值返回路径名的本地格式表示。

参数

(无)

返回值

路径名的本地字符串表示，使用本地语法、本地字符类型和本地字符编码。此字符串适用于与 OS API 一起使用。

说明

转换函数 (3) 提供是为了让接受 std::basic_string 文件名的 API 能够使用路径名，而无需更改代码。

示例

运行此代码

#include <cstdio>
#ifdef _MSC_VER
#include <fcntl.h>
#include <io.h>
#else
#include <clocale>
#include <locale>
#endif
#include <filesystem>
#include <fstream>
 
int main()
{
#ifdef _MSC_VER
    _setmode(_fileno(stderr), _O_WTEXT);
#else
    std::setlocale(LC_ALL, "");
    std::locale::global(std::locale(""));
#endif
 
    std::filesystem::path p(u8"要らない.txt");
    std::ofstream(p) << "File contents"; // Prior to LWG2676 uses operator string_type()
                                         // on MSVC, where string_type is wstring, only
                                         // works due to non-standard extension.
                                         // Post-LWG2676 uses new fstream constructors
 
    // Native string representation can be used with OS-specific APIs
#ifdef _MSC_VER
    if (std::FILE* f = _wfopen(p.c_str(), L"r"))
#else
    if (std::FILE* f = std::fopen(p.c_str(), "r"))
#endif
    {
        for (int ch; (ch = fgetc(f)) != EOF; std::putchar(ch))
        {}
        std::fclose(f);
    }
 
    std::filesystem::remove(p);
}

可能的输出

File contents

参见

stringwstringu8stringu16stringu32string	返回以本地路径名格式转换为字符串的路径 (公共成员函数)
generic_stringgeneric_wstringgeneric_u8stringgeneric_u16stringgeneric_u32string	返回以通用路径名格式转换为字符串的路径 (公共成员函数)