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Get a Header Field from an Alternative Body

Demonstrates the Chilkat Email.GetAltHeaderField method, which returns the value of a header field within the Nth alternative body's MIME sub-part. The first argument is the zero-based alternative index; the second is the header field name. This example builds a message with plain-text and HTML alternatives and reads the Content-Type of the first alternative.

Background: A multipart/alternative message is a tree: each alternative body is its own MIME sub-part with its own little header block (Content-Type, Content-Transfer-Encoding, etc.). The top-level Email header methods read the message headers, whereas GetAltHeaderField reaches into a specific alternative's sub-part — useful for inspecting exactly how each representation is typed and encoded.

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

#  Demonstrates the GetAltHeaderField method, which returns the value of a header field
#  within the Nth alternative body's MIME sub-part.  The 1st argument is the zero-based
#  alternative index; the 2nd is the header field name.

$email = New-Object Chilkat.Email

#  Create an email with plain-text and HTML alternatives.
$email.SetTextBody("This is the plain-text alternative.","text/plain")
$email.AddHtmlAlternativeBody("<html><body>This is the HTML alternative.</body></html>")

#  Get the Content-Type header of the first alternative body (index 0).
$ct = $email.GetAltHeaderField(0,"Content-Type")
$("Alternative 0 Content-Type: " + $ct)