Get a Header Attribute of an Attached Message

See more Email Object Examples

Demonstrates the Chilkat Email.GetAttachedMessageAttr method, which returns a header-field attribute value for the Nth attached (embedded) email. The first argument is the zero-based attached-message index, the second is the header field name, and the third is the attribute name. This example attaches an email and reads the filename attribute of its Content-Disposition header.

Background: MIME header fields can carry named attributes (parameters) after the main value — for example Content-Disposition: attachment; filename="report.eml", where filename is an attribute. Rather than parsing the raw header yourself, this method extracts a single named attribute from a chosen header of a specific embedded message, which is convenient when a message forwards other emails as nested message/rfc822 parts.

Chilkat Go Downloads

Download Chilkat for Go

    success := false

    //  Demonstrates the GetAttachedMessageAttr method, which returns a header-field attribute
    //  value for the Nth attached (embedded) email.  The first argument is the zero-based
    //  attached-message index, the second is the header field name, and the third is the attribute name.

    //  Build an inner email to attach.
    innerEmail := chilkat.NewEmail()
    innerEmail.SetSubject("Embedded message")
    innerEmail.SetFrom("alice@example.com")
    innerEmail.AddTo("Bob","bob@example.com")

    //  Attach it to an outer email as a message/rfc822 part.
    email := chilkat.NewEmail()
    email.SetSubject("Has an attached message")
    success = email.AttachEmail(innerEmail)
    if success == false {
        fmt.Println(email.LastErrorText())
        innerEmail.DisposeEmail()
        email.DisposeEmail()
        return
    }

    //  Get the "filename" attribute of the "Content-Disposition" header of the first
    //  attached message (index 0).
    fname := email.GetAttachedMessageAttr(0,"Content-Disposition","filename")
    fmt.Println("Attached message filename attribute: ", *fname)

    innerEmail.DisposeEmail()
    email.DisposeEmail()