Lua

Check if a MIME Entity is multipart/alternative

Demonstrates the Chilkat Mime.IsMultipartAlternative method, which returns whether the Content-Type is exactly multipart/alternative. It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Recognizing multipart/alternative matters because its children are the same content in different formats — you display one (usually the last renderable), not all of them. That is the opposite of multipart/mixed, where every child is shown.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the Mime.IsMultipartAlternative method, which returns whether the Content-Type is multipart/alternative.  It takes no arguments.

local mime = chilkat.Mime.new()
local success = mime:load_mime_file("qa_data/multipart_message.eml")
if not success then
    print(mime.last_error_text)
    return
end

if mime:is_multipart_alternative() then
    print("This is a multipart/alternative entity.")
else
    print("This is not multipart/alternative.")
end