如何判断给定路径是目录还是文件？(C/C++)
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How can I tell if a given path is a directory or a file? (C/C++)
提问by DylanJ
I'm using C and sometimes I have to handle paths like
我正在使用 C，有时我必须处理类似的路径
- C:\Whatever
- C:\Whatever\
- C:\Whatever\Somefile
- C:\随便
- C:\随便\
- C:\随便\某个文件
Is there a way to check if a given path is a directory or a given path is a file?
有没有办法检查给定路径是目录还是给定路径是文件？
采纳答案by Colen
Call GetFileAttributes, and check for the FILE_ATTRIBUTE_DIRECTORY attribute.
调用GetFileAttributes，并检查 FILE_ATTRIBUTE_DIRECTORY 属性。
回答by
stat() will tell you this.
stat() 会告诉你这个。
struct stat s;
if( stat(path,&s) == 0 )
{
if( s.st_mode & S_IFDIR )
{
//it's a directory
}
else if( s.st_mode & S_IFREG )
{
//it's a file
}
else
{
//something else
}
}
else
{
//error
}
回答by jeffm
In Win32, I usually use PathIsDirectoryand its sister functions. This works in Windows 98, which GetFileAttributes does not (according to the MSDN documentation.)
在 Win32 中，我通常使用PathIsDirectory及其姊妹函数。这适用于 Windows 98，而 GetFileAttributes 不适用（根据 MSDN 文档。）
回答by Roi Danton
With C++14/C++17 you can use the platform independent is_directory()and is_regular_file()from the filesystem library.
随着C ++ 14 / C ++的平台独立17可以使用is_directory()并is_regular_file()从文件系统库。
#include <filesystem> // C++17
#include <iostream>
namespace fs = std::filesystem;
int main()
{
const std::string pathString = "/my/path";
const fs::path path(pathString); // Constructing the path from a string is possible.
std::error_code ec; // For using the non-throwing overloads of functions below.
if (fs::is_directory(path, ec))
{
// Process a directory.
}
if (ec) // Optional handling of possible errors.
{
std::cerr << "Error in is_directory: " << ec.message();
}
if (fs::is_regular_file(path, ec))
{
// Process a regular file.
}
if (ec) // Optional handling of possible errors. Usage of the same ec object works since fs functions are calling ec.clear() if no errors occur.
{
std::cerr << "Error in is_regular_file: " << ec.message();
}
}
In C++14 use std::experimental::filesystem.
在 C++14 中使用std::experimental::filesystem.
#include <experimental/filesystem> // C++14
namespace fs = std::experimental::filesystem;
Additional implemented checks are listed in section "File types".
其他实施的检查列在“文件类型”部分。
回答by Scott
On Windows you can use GetFileAttributeson an open handle.
在 Windows 上，您可以在打开的句柄上使用GetFileAttributes。
回答by anurag-jain
If you're using CFileyou can try
如果您正在使用，CFile您可以尝试
CFileStatus status;
if (CFile::GetStatus(fileName, status) && status.m_attribute == 0x10){
//it's directory
}
回答by Varvara
Easier to try FileInfo.isDir() in qt
更容易在 qt 中尝试 FileInfo.isDir()
