Rust

Access a Part in a Multipart MIME Entity

Demonstrates the Chilkat Mime.PartAt method, which provides live access to the direct child at a zero-based index. The first argument is the index and the second is a Mime object that will reference the child. Modifying it modifies the child stored in the parent tree.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you reach into a multipart message to inspect or edit an individual part — read a part's Content-Type, extract an attachment's body, or change a part in place. The key point is that the returned Mime is a live reference, not a copy, so edits to it flow back into the parent tree. Loop from 0 to NumParts - 1 to visit every direct child.

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Rust


let mime = chilkat::Mime::new();
if mime.load_mime_file("qa_data/multipart_message.eml").is_err() {
    println!("{}", mime.last_error_text());
    return;
}

// PartAt provides LIVE access to a direct child part.  The 1st argument is the zero-based index
// and the 2nd is a Mime object that will reference the child.  Modifying it modifies the child in
// the parent tree.
let n = mime.num_parts();
println!("Number of parts: {}", n);

let part = chilkat::Mime::new();
for i in 0..n {
    if mime.part_at(i, &part).is_err() {
        println!("{}", mime.last_error_text());
        return;
    }

    println!("Part {} Content-Type: {}", i, part.content_type());
}