Swift

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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func chilkatTest() {
    //  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 = CkoEmail()!
    email.subject = "GetRelatedContentType example"

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

    //  Add the related style sheet (index 0).
    email.addRelatedString2(filenameInHtml: "styles.css", str: "body { color: navy; }", charset: "utf-8")

    //  Read the Content-Type of the first related item (index 0).
    var ct: String? = email.getRelatedContentType(index: 0)
    print("Related item 0 Content-Type: \(ct!)")

}