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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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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$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 = New-Object Chilkat.Email
$innerEmail.Subject = "Embedded message"
$innerEmail.From = "alice@example.com"
$innerEmail.AddTo("Bob","bob@example.com")

#  Attach it to an outer email as a message/rfc822 part.
$email = New-Object Chilkat.Email
$email.Subject = "Has an attached message"
$success = $email.AttachEmail($innerEmail)
if ($success -eq $false) {
    $($email.LastErrorText)
    exit
}

#  Get the "filename" attribute of the "Content-Disposition" header of the first
#  attached message (index 0).
$fname = $email.GetAttachedMessageAttr(0,"Content-Disposition","filename")
$("Attached message filename attribute: " + $fname)