Swift

Add a Related String Addressed by Name

Demonstrates the Chilkat Email.AddRelatedString2 method, which adds a related item from an in-memory string, addressed by the name used in the HTML rather than by a generated Content-ID. The first argument should match the filename used in an HTML img src or a stylesheet link href; the second is the Unicode content; the third is the charset it is converted to. Related items are images and style sheets embedded to support the HTML display — they are not attachments. This example embeds a CSS style sheet referenced as styles.css.

Background: This is the string-based, Content-Location counterpart to AddRelatedString. Instead of the HTML pointing at a cid: URL, it keeps a natural reference like href="styles.css", and the related part is matched to it by name. That makes it a good fit when you are turning existing web content into email and want the original relative references to keep working without rewriting them.

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func chilkatTest() {
    //  Demonstrates the AddRelatedString2 method, which adds a related item to the email from
    //  an in-memory string, addressed by the name used in the HTML (Content-Location).  The first
    //  argument is the filename used in the HTML reference, the second is the content, and the
    //  third is the charset.

    let email = CkoEmail()!
    email.subject = "Email with a related style sheet (by name)"

    //  The HTML references the style sheet by the same name used for the related item.
    email.setHtmlBody(html: "<html><head><link rel=\"stylesheet\" href=\"styles.css\"/></head><body>Styled.</body></html>")

    //  Add the style sheet as a related item addressed by the name used in the HTML.
    email.addRelatedString2(filenameInHtml: "styles.css", str: "body { color: navy; }", charset: "utf-8")

    print("NumRelatedItems = \(email.numRelatedItems.intValue)")

}