Rust

Get a Header Field by Name

Demonstrates the Chilkat Email.GetHeaderField method, which returns the value of a header field by name. Header-field names are case-insensitive, so X-Priority and x-priority refer to the same field. This example reads several headers by name.

Background: Looking up a header by name is the quickest way to read a known field like Subject or a custom X- header. One caveat: some header names (such as Received) can legitimately appear more than once. When a field may repeat and you need every occurrence, enumerate by index with GetHeaderFieldName and GetHeaderFieldValue instead of looking up by name.

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Rust

// Demonstrates the GetHeaderField method, which returns the value of a header field by
// name.  Header-field names are case-insensitive.

let email = chilkat::Email::new();
email.set_subject("Quarterly report");
email.set_from("alice@example.com");
email.add_header_field("X-Priority", "1");

// Get header field values by name.
println!("Subject = {}", email.get_header_field("Subject").unwrap_or_default());
println!("From = {}", email.get_header_field("From").unwrap_or_default());
println!("X-Priority = {}", email.get_header_field("x-priority").unwrap_or_default());