Ruby

Get a Header Attribute of an Attached Message

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.

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Ruby

require 'chilkat'

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::CkEmail.new()
innerEmail.put_Subject("Embedded message")
innerEmail.put_From("alice@example.com")
innerEmail.AddTo("Bob","bob@example.com")

#  Attach it to an outer email as a message/rfc822 part.
email = Chilkat::CkEmail.new()
email.put_Subject("Has an attached message")
success = email.AttachEmail(innerEmail)
if (success == false)
    print email.lastErrorText() + "\n";
    exit
end

#  Get the "filename" attribute of the "Content-Disposition" header of the first
#  attached message (index 0).
fname = email.getAttachedMessageAttr(0,"Content-Disposition","filename")
print "Attached message filename attribute: " + fname + "\n";