Tcl

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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Tcl


load ./chilkat.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.

set email [new_CkEmail]

#  Create an email with plain-text and HTML alternatives.
CkEmail_SetTextBody $email "This is the plain-text alternative." "text/plain"
CkEmail_AddHtmlAlternativeBody $email "<html><body>This is the HTML alternative.</body></html>"

#  Get the Content-Type header of the first alternative body (index 0).
set ct [CkEmail_getAltHeaderField $email 0 "Content-Type"]
puts "Alternative 0 Content-Type: $ct"

delete_CkEmail $email