Convert Inline Data-URL Images to Related Parts

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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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    success := false

    //  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.

    email := chilkat.NewEmail()
    email.SetSubject("Convert inline images")

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

    fmt.Println("NumRelatedItems before = ", email.NumRelatedItems())

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

    success = email.ConvertInlineImages()
    if success == false {
        fmt.Println(email.LastErrorText())
        email.DisposeEmail()
        return
    }

    fmt.Println("NumRelatedItems after = ", email.NumRelatedItems())

    email.DisposeEmail()