Rust

Save All MIME Attachments to Files

Demonstrates the Chilkat Mime.PartsToFiles method, which recursively traverses the MIME tree and saves each part having a nonempty filename parameter to a directory. The first argument is the destination directory and the second is a StringTable that receives the saved filenames.

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 extracts every named attachment from a message in one call, walking the whole tree so it finds attachments nested inside multipart containers. It saves only parts that declare a filename — inline body parts without one are skipped — and reports what it wrote via the StringTable, which is handy for logging or follow-up processing. The destination directory must already exist.

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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;
}

// Recursively traverse the MIME tree and save each part that has a nonempty "filename" parameter
// to a directory.  The 1st argument is the destination directory and the 2nd is a StringTable
// that receives the saved filenames.
let saved_files = chilkat::StringTable::new();
if mime.parts_to_files("qa_output/attachments", &saved_files).is_err() {
    println!("{}", mime.last_error_text());
    return;
}

let n = saved_files.count();
println!("Saved {} files:", n);
for i in 0..n {
    let Ok(name) = saved_files.string_at(i) else {
        println!("{}", saved_files.last_error_text());
        return;
    };

    println!("{}", name);
}