Get a Header Attribute of an Attachment

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Demonstrates the Chilkat Email.GetAttachmentAttr method, which returns a header-field attribute value from a header field of the Nth attachment. The first argument is the zero-based attachment index, the second names a header field, and the third names an attribute within it. This example reads the filename attribute of the attachment's Content-Disposition header.

Background: A MIME header can have named parameters after its main value, such as Content-Type: text/plain; charset="utf-8"; name="notes.txt". Here charset and name are attributes. GetAttachmentAttr pulls out one named attribute from a chosen header of a specific attachment, sparing you from parsing the raw header string and dealing with quoting or ordering.

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    //  Demonstrates the GetAttachmentAttr method, which returns a header-field attribute value
    //  from a header field of the Nth attachment.  The first argument is the zero-based attachment
    //  index, the second is the header field name, and the third is the attribute name.

    email := chilkat.NewEmail()
    email.SetSubject("Attachment header attribute")

    email.AddStringAttachment("notes.txt","Some notes.")

    //  Get the "filename" attribute of the attachment's Content-Disposition header (index 0).
    fname := email.GetAttachmentAttr(0,"Content-Disposition","filename")
    fmt.Println("Attachment filename attribute: ", *fname)

    email.DisposeEmail()