# Function std::fs::read_dir

1.0.0 · source ·

    pub fn read_dir<P: AsRef<Path>>(path: P) -> Result<ReadDir>

Expand description

Returns an iterator over the entries within a directory.

The iterator will yield instances of `io::Result<DirEntry>`. New errors may be encountered after an iterator is initially constructed. Entries for the current and parent directories (typically `.` and `..`) are skipped.

## Platform-specific behavior

This function currently corresponds to the `opendir` function on Unix and the `FindFirstFile` function on Windows. Advancing the iterator currently corresponds to `readdir` on Unix and `FindNextFile` on Windows. Note that, this may change in the future.

The order in which this iterator returns entries is platform and filesystem dependent.

## Errors

This function will return an error in the following situations, but is not limited to just these cases:

- The provided `path` doesn’t exist.
- The process lacks permissions to view the contents.
- The `path` points at a non-directory file.

## Examples

    use std::io;
    use std::fs::{self, DirEntry};
    use std::path::Path;

    // one possible implementation of walking a directory only visiting files
    fn visit_dirs(dir: &Path, cb: &dyn Fn(&DirEntry)) -> io::Result<()> {
        if dir.is_dir() {
            for entry in fs::read_dir(dir)? {
                let entry = entry?;
                let path = entry.path();
                if path.is_dir() {
                    visit_dirs(&path, cb)?;
                } else {
                    cb(&entry);
                }
            }
        }
        Ok(())
    }

Run

    use std::{fs, io};

    fn main() -> io::Result<()> {
        let mut entries = fs::read_dir(".")?
            .map(|res| res.map(|e| e.path()))
            .collect::<Result<Vec<_>, io::Error>>()?;

        // The order in which `read_dir` returns entries is not guaranteed. If reproducible
        // ordering is required the entries should be explicitly sorted.

        entries.sort();

        // The entries have now been sorted by their path.

        Ok(())
    }

Run