search_path.rs

use windows::{core::*, Win32::Storage::FileSystem::*};

fn search_path(filename: &str) -> Result<String> {
    let filename = &HSTRING::from(filename);
    let len = unsafe { SearchPathW(None, filename, None, None, None) };

    if len == 0 {
        return Err(Error::from_win32());
    }

    let mut buffer = vec![0; len as usize];
    let len = unsafe { SearchPathW(None, filename, None, Some(&mut buffer), None) };
    buffer.truncate(len as usize);

    Ok(String::from_utf16(&buffer)?)
}

fn main() -> Result<()> {
    println!("{}", search_path("midl.exe")?);
    Ok(())
}