Lua

Set a MIME Body, Preserving Content Headers

Demonstrates the Chilkat Mime.SetBody method, which sets the current part's body while preserving the existing content headers (Content-Type, charset, Content-Transfer-Encoding). The only argument is the body text; it is a void method.

Background: Unlike the SetBodyFrom... methods, which set both the content and the headers that describe it, SetBody replaces only the body text and leaves the existing Content-Type and encoding in place. That is what you want when the media type is already correct and you simply need to swap in new content — updating a templated part, for instance — without re-declaring its type.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the Mime.SetBody method, which sets the current part's body while preserving the
-- existing content headers (Content-Type, charset, Content-Transfer-Encoding).  The only argument
-- is the body text.  It is a void method.

local mime = chilkat.Mime.new()

-- Establish the content headers first.
local success = mime:set_body_from_plain_text("initial")
if not success then
    print(mime.last_error_text)
    return
end

-- Replace just the body text, keeping the existing Content-Type and encoding.
mime:set_body("This is the replacement body text.")

local mimeText = mime:get_mime()
if not mime.last_method_success then
    print(mime.last_error_text)
    return
end

print(mimeText)