Lua

Set the Charset of an Attachment

Demonstrates the Chilkat Email.SetAttachmentCharset method, which sets the charset parameter of the Content-Type header field for the attachment at a given zero-based index. This example adds a text attachment and sets its charset to utf-8.

Background: For a text attachment, the charset parameter tells the receiving client which character encoding the bytes use, so accented or non-Latin text renders correctly. Setting it explicitly (typically utf-8) removes ambiguity when the attachment contains non-ASCII content — without it, a client may guess wrong and display garbled characters.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the SetAttachmentCharset method, which sets the charset parameter of the
-- Content-Type header field for the attachment at the given zero-based index.

local email = chilkat.Email.new()
email.subject = "Set attachment charset"

email:add_string_attachment("notes.txt", "Some notes.")

-- Set the charset of the first attachment (index 0) to utf-8.
local success = email:set_attachment_charset(0, "utf-8")
if not success then
    print(email.last_error_text)
    return
end

-- The attachment's Content-Type now includes charset="utf-8".
print(email:get_mime())