Swift

Get a Header Field of a Related Item

Demonstrates the Chilkat Email.GetRelatedHeader method, which returns the value of a named header field of a related item. The first argument is the zero-based related-item index and the second is the MIME header-field name. This example reads the Content-Type header of a related style sheet.

Background: Each related item is a MIME part with its own header block. Where GetRelatedAttr extracts a single named parameter from a header, GetRelatedHeader returns the entire value of a header field — for example the full Content-Type or Content-Location line — which is handy for inspecting exactly how an embedded resource is described.

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func chilkatTest() {
    //  Demonstrates the GetRelatedHeader method, which returns the value of a header field (by
    //  name) of a related item.  The first argument is the zero-based related-item index and the
    //  second is the MIME header-field name.

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

    //  Set an HTML body and add a related style sheet (index 0).
    email.setHtmlBody(html: "<html><head><link rel=\"stylesheet\" href=\"styles.css\"/></head><body>Styled.</body></html>")
    email.addRelatedString2(filenameInHtml: "styles.css", str: "body { color: navy; }", charset: "utf-8")

    //  Get the Content-Type header of the first related item (index 0).
    var ct: String? = email.getRelatedHeader(index: 0, fieldName: "Content-Type")
    print("Related item 0 Content-Type: \(ct!)")

}