Swift

Get the Nth Text Part of a Given Content-Type

Demonstrates the Chilkat Email.GetNthTextPartOfType method, which returns the text content of the Nth non-multipart MIME part matching a Content-Type pattern. The arguments are a zero-based index among the matching parts, the content-type pattern, an inlineOnly flag, and an excludeAttachments flag. This example retrieves the first text/html part.

Background: A MIME message is a tree of parts, and sometimes you want a specific one by its type rather than by walking alternatives or bodies. The content-type pattern can be exact (text/html) or a wildcard (text/*), and the two boolean flags narrow the search — inlineOnly restricts to inline (displayed) parts, and excludeAttachments skips parts marked as attachments — so you can target exactly the text you care about.

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func chilkatTest() {
    //  Demonstrates the GetNthTextPartOfType method, which returns the text content of the Nth
    //  non-multipart MIME part matching a Content-Type pattern.  The first argument is the zero-based
    //  index among matching parts, the second is the Content-Type pattern, the third is inlineOnly, and the fourth is
    //  excludeAttachments.

    let email = CkoEmail()!
    email.subject = "GetNthTextPartOfType example"

    email.setTextBody(bodyText: "This is the plain-text version.", contentType: "text/plain")
    email.addHtmlAlternativeBody(body: "<html><body>This is the HTML version.</body></html>")

    //  Get the first (index 0) part whose content type matches text/html.
    var htmlPart: String? = email.getNthTextPart(ofType: 0, contentType: "text/html", inlineOnly: false, excludeAttachments: false)
    print("First text/html part:")
    print("\(htmlPart!)")

}