Lua

Set the Content-Disposition of an Attachment

Demonstrates the Chilkat Email.SetAttachmentDisposition method, which sets the Content-Disposition value for the attachment at a given zero-based index. The default disposition is attachment. This example changes an attachment's disposition to inline.

Background: The Content-Disposition header hints how a client should present a part: attachment means "offer it as a download," while inline means "display it within the message" (as an email client does with an embedded image). Setting it lets you control that behavior — though clients ultimately decide how to honor the hint.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the SetAttachmentDisposition method, which sets the Content-Disposition
-- value for the attachment at the given zero-based index.  The default disposition is
-- "attachment".

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

email:add_string_attachment("image.txt", "(pretend inline content)")

-- Set the disposition of the first attachment (index 0) to "inline".
local success = email:set_attachment_disposition(0, "inline")
if not success then
    print(email.last_error_text)
    return
end

-- The attachment's Content-Disposition is now "inline".
print(email:get_mime())