c++ std::filesystem discussion, std::filesystem was added to the ISO C++ standard library in C++17
Specification available from http://en.cppreference.com/w/cpp/filesystem
Questions tagged [std-filesystem]
165 questions
0
votes
2 answers
std::filesystem::recursive_directory_iterator and read permision
Under Linux:
I am trying to access a folder using 'recursive_directory_iterator' and it is throwing a "Permission denied" exception.
Here are the permissions for the given folder:
ls -l /my_folder/
total 4
drwxr-xr-x 8 root root 4096 Nov 2 2021…
dkish
- 319
- 3
- 13
0
votes
0 answers
std::filesystem::path::parent_path() behavior
When setting a path by passing just a file name to mean, the path is current_path() + filename, it seems std::filesystem::path recognizes a parent path only when explicitly given as relative path.
Its easier to explain with code - the following code…
dkish
- 319
- 3
- 13
0
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0 answers
How to use the UNC format to specify a full root-name in Windows
I am trying to work with UNC to access files on Windows on a partition that does not have a drive letter. The UNC I am trying to use (as returned by mountvol) is
\\?\Volume{6ed63a9f-b672-4f57-8c22-8dd824dd793e}\
Using powershell Get-ChildItem…
Claude
- 51
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- 7
0
votes
1 answer
std::unordered_set: compile error on clang and g++ below v.12. Bug or user error?
I added the following function template to my project, and a user complained that it wouldn't compile on their system anymore:
template
std::size_t removeDuplicates(std::vector& vec)
{
std::unordered_set seen;
auto newEnd…
RL-S
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- 21
0
votes
1 answer
std::filesystem example not compiling on c++ 17
I cant compile this official cpp filesystem reference example using c++ 17 clang:
https://en.cppreference.com/w/cpp/filesystem/recursive_directory_iterator
#include
#include
#include
namespace fs =…
Happy Machine
- 987
- 8
- 30
0
votes
0 answers
Portable method in C++ to determine special folder locations (Downloads, Documents, Preferences, etc.)
I've been searching for a portable method in Boost or C++17 std::filesystem (or POSIX) to determine the system sanctioned locations of the user's Documents, Downloads, and Preferences. Do these locations really need to be hard-wired, or is there a…
SMGreenfield
- 1,680
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0
votes
0 answers
std::filesystem sees deleted files
Why std::filesystem sees deleted files?
for (auto& file : std::filesystem::recursive_directory_iterator(game_folder))
{
cout << file.path().string().c_str() << endl;
}
this code shows me the files deleted (by me)
amunino
- 9
- 1
0
votes
0 answers
Portably check whether a file is readable
I'm asking the cross-platform version of this question:
C++: How to check if a file/directory is readable? (PHP equivalent: is_readable)
I have a filesystem::path of a file (let's ignore for simplicity the case of directories, symlinks etc.), and I…
einpoklum
- 118,144
- 57
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- 684
0
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3 answers
Error with std::filesystem::copy copying a file to another pre-existing directory
See below for the following code, and below that, the error that follows.
std::string source = "C:\\Users\\cambarchian\\Documents\\tested";
std::string destination = "C:\\Users\\cambarchian\\Documents\\tester";
std::filesystem::path sourcepath =…
0
votes
0 answers
C++ std::filesystem::last_write_time operator< sometimes not correct?
I want to compare the file age of two files. I tried this:
auto ft1 = std::filesystem::last_write_time("file1");
auto ft2 = std::filesystem::last_write_time("file2");
if (ft1 < ft2)
std::cout << "file1 is older than file2.";
Unfortunately…
0
votes
1 answer
Can std::filesystem::permissions change secure file permissions
I have been experimenting, with the std::filesystem and I came across the permissions function, which allows you to change the access permissions that users have to files. This seems almost like it could be a bad thing though because anyone can run…
Gary Fisher
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- 7
0
votes
1 answer
std::filesystem::remove_all fails on read-only file
I am trying to remove a complete git repository clone from my disk using std::filesystem::remove_all()
std::filesystem::remove_all( myRepoName );
This throws an exception
terminate called after throwing an instance of…
ravenspoint
- 19,093
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0
votes
0 answers
Unable to get path from std::filesystem in global static object
Build Environment:
Visual Studio 2022
Windows 10 64-bit
C++ Standard : C++20
I am trying to get the directory of my executable file. In my earlier code based on C++17 standard I could read the path using std::filesystem::current_path().string()…
Dark Sorrow
- 1,681
- 14
- 37
0
votes
1 answer
Cannot use filsesystem in ROS node
I'm trying to use std::filesystem to open a folder and iterate through its files, sorted by name.
I'm using the code from this question inside a very basic ros package:
node.cpp
#include
#include
#include
#include…
rebubi
- 11
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- 3
0
votes
0 answers
Is there an equivelent of Win32 API MoveFileEx() in C++ filesystem?
I am porting a codebase that depends on Win32 API to C++ 17. There is a class that is responsible for handling files. The function I am currently looking at looks like this:
bool project::filesystem::FileSystem::rename(const std::string&…
rbaleksandar
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