Lua

Count the Messages in a multipart/digest Email

Demonstrates the read-only Chilkat Email.NumDigests property, which is the number of message/rfc822 parts contained within a multipart/digest enclosure. If no such enclosure exists, the value is 0. Digest indexes are zero-based; use GetDigestEmail to retrieve an individual bundled message as its own Email object. This example loads a digest email and lists each message's subject.

Background: A multipart/digest is a way to package many separate emails inside one carrier message — historically used by mailing lists to send a single daily "digest" containing all of that day's posts. Each bundled item is a complete message/rfc822 email with its own headers and body. This differs from NumAttachedMessages, which counts nested messages attached to an ordinary email rather than the members of a digest enclosure.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the read-only Email.NumDigests property, which is the number of
-- message/rfc822 parts contained within a multipart/digest enclosure.  If there is no
-- multipart/digest enclosure, the value is 0.  Digest indexes are zero-based.

local email = chilkat.Email.new()

-- Load a multipart/digest email (a single email that bundles many messages).
local success = email:load_eml("qa_data/eml/digest.eml")
if not success then
    print(email.last_error_text)
    return
end

local n = email.num_digests
print("NumDigests = " .. n)

-- Retrieve each bundled message as its own Email object.
local digestEmail = chilkat.Email.new()
for i = 0, n - 1 do
    success = email:get_digest_email(i, digestEmail)
    print("Digest " .. i .. " subject: " .. digestEmail.subject)
end

-- Note: Paths such as "qa_data/..." are relative local filesystem paths,
-- relative to the current working directory of the running application.