Rust

Convert Inline Data-URL Images to Related Parts

Demonstrates the Chilkat Email.ConvertInlineImages method, which converts images embedded inline within HTML (as base64 data URLs) into multipart/related MIME parts referenced from the HTML by cid:. This example sets an HTML body containing a data-URL image and converts it.

Background: HTML can embed an image two ways: as a data: URL (the base64 bytes sit right in the src attribute) or as a related part referenced by cid:. Many email clients don't render data: URLs for security reasons, so converting them to proper multipart/related parts — the traditional email way to embed images — greatly improves how reliably the images display.

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Rust


// Demonstrates the ConvertInlineImages method, which converts images embedded inline within
// HTML (as base64 data URLs) into multipart/related MIME parts referenced from the HTML by
// CID.

let email = chilkat::Email::new();
email.set_subject("Convert inline images");

// An HTML body with a base64 data-URL image (a 1x1 PNG).
email.set_html_body("<html><body><img src=\"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==\"/></body></html>");

println!("NumRelatedItems before = {}", email.num_related_items());

// Convert the inline data-URL image(s) to multipart/related parts referenced by CID.

if email.convert_inline_images().is_err() {
    println!("{}", email.last_error_text());
    return;
}

println!("NumRelatedItems after = {}", email.num_related_items());