Rust

Check if a MIME Part is Application Data

Demonstrates the Chilkat Mime.IsApplicationData method, which returns whether the Content-Type begins with application/. It takes no arguments and applies to the current part.

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

Background: The application/ family covers everything that is not plain media or text — PDFs, Office documents, ZIP archives, JSON, and the S/MIME application/pkcs7-* types. This broad check is a quick way to flag "binary document" parts, though you will usually look at the specific subtype to decide how to handle each.

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Rust


// Demonstrates the Mime.IsApplicationData method, which returns whether the Content-Type begins with application/.  It takes no arguments and applies to the current
// part.  This example iterates the parts of a multipart message and reports which ones match.

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

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

    if part.is_application_data() {
        println!("Part {} ({}) is application data.", i, part.content_type());
    }

}