simpler.rs

use windows::{
    core::HSTRING,
    w,
    Win32::{
        System::Com::CoInitialize,
        UI::Shell::{
            Common::ITEMIDLIST, ILCreateFromPathW, SHCreateShellItemArray, SIGDN_FILESYSPATH,
        },
    },
};

fn main() -> windows::core::Result<()> {
    unsafe {
        CoInitialize(None)?;

        let child_items: Vec<_> = std::fs::read_dir(r#"C:\Windows\Help"#)
            .unwrap()
            .filter_map(|entry| entry.ok())
            .filter(|entry| entry.path().is_dir())
            .map(|entry| {
                let wide_path = HSTRING::from(entry.path().as_path());
                ILCreateFromPathW(&wide_path) as *const ITEMIDLIST
            })
            .collect();
        debug_assert!(!child_items.is_empty());

        // NOTE: You may want to use SHParseDisplayName instead
        let parent_item = ILCreateFromPathW(w!(r#"C:\Windows\Help"#));
        debug_assert_ne!(parent_item, std::ptr::null_mut());

        let item_array = SHCreateShellItemArray(Some(parent_item), None, Some(&child_items))?;
        debug_assert!(item_array.GetCount()? > 0);

        println!(
            "Items[0] => {}",
            item_array
                .GetItemAt(0)?
                .GetDisplayName(SIGDN_FILESYSPATH)?
                .display()
        );

        // ...
        // Don't forget to free the items in child_items
        // ...
    }

    Ok(())
}