Lua

Get an Alternative Body into a BinData

Demonstrates the Chilkat Email.GetAlternativeBodyBd method, which copies the contents of the Nth alternative body into a BinData object. The first alternative body is at index 0, and it should only be called when NumAlternatives is greater than 0. This example builds a message with plain-text and HTML alternatives and copies the first into a BinData.

Background: This is the binary counterpart to GetAlternativeBody (which returns text). Reading an alternative into a BinData preserves the exact bytes — important when a body part uses a binary or unusual transfer encoding, or when you intend to hash it or write it out verbatim rather than decode it to a string.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the GetAlternativeBodyBd method, which copies the contents of the Nth
-- alternative body into a BinData object.  The first alternative body is at index 0; call
-- only when NumAlternatives is greater than 0.

local email = chilkat.Email.new()
email.subject = "GetAlternativeBodyBd example"

email:set_text_body("This is the plain-text alternative.", "text/plain")
email:add_html_alternative_body("<html><body>This is the HTML alternative.</body></html>")

-- Copy the first alternative body (index 0) into a BinData object.
local bd = chilkat.BinData.new()

local success = email:get_alternative_body_bd(0, bd)
if not success then
    print(email.last_error_text)
    return
end

print("Alternative 0 size (bytes) = " .. bd.num_bytes)