Rust

Get a Header Attribute of an Attachment

Demonstrates the Chilkat Email.GetAttachmentAttr method, which returns a header-field attribute value from a header field of the Nth attachment. The first argument is the zero-based attachment index, the second names a header field, and the third names an attribute within it. This example reads the filename attribute of the attachment's Content-Disposition header.

Background: A MIME header can have named parameters after its main value, such as Content-Type: text/plain; charset="utf-8"; name="notes.txt". Here charset and name are attributes. GetAttachmentAttr pulls out one named attribute from a chosen header of a specific attachment, sparing you from parsing the raw header string and dealing with quoting or ordering.

Chilkat Rust Downloads

Download Chilkat for Rust

Rust

// Demonstrates the GetAttachmentAttr method, which returns a header-field attribute value
// from a header field of the Nth attachment.  The first argument is the zero-based attachment
// index, the second is the header field name, and the third is the attribute name.

let email = chilkat::Email::new();
email.set_subject("Attachment header attribute");

let _ = email.add_string_attachment("notes.txt", "Some notes.");

// Get the "filename" attribute of the attachment's Content-Disposition header (index 0).
let fname = email.get_attachment_attr(0, "Content-Disposition", "filename").unwrap_or_default();
println!("Attachment filename attribute: {}", fname);