Rust

Get the Content-Type of a Related Item

Demonstrates the Chilkat Email.GetRelatedContentType method, which returns the Content-Type of the Nth related content item in an email. The index is zero-based. This example adds a related style sheet and reads its content type.

Background: Each related item declares a Content-Type — image/png for an inline image, text/css for a style sheet, and so on — that tells the rendering client how to use it. Reading the content type lets a program enumerate a message's embedded resources and act on them by kind, for example collecting every inline image while ignoring the style sheets.

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Rust

// Demonstrates the GetRelatedContentType method, which returns the Content-Type of the Nth
// related content item in an email.  The index is zero-based.

let email = chilkat::Email::new();
email.set_subject("GetRelatedContentType example");

// The HTML references the style sheet by name (Content-Location).
email.set_html_body("<html><head><link rel=\"stylesheet\" href=\"styles.css\"/></head><body>Styled.</body></html>");

// Add the related style sheet (index 0).
email.add_related_string2("styles.css", "body { color: navy; }", "utf-8");

// Read the Content-Type of the first related item (index 0).
let ct = email.get_related_content_type(0).unwrap_or_default();
println!("Related item 0 Content-Type: {}", ct);