(Lua) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

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    -- In the following call to loadlib, change the path (./chilkat.dll) to the relative or absolute directory where the chilkat.dll, chilkat.so, or chilkat.dylib is located.
    chilkat = assert(package.loadlib("./chilkat.dll", "luaopen_chilkat"))()
    print(chilkat._VERSION)

    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    local imap = chilkat.newImap{}

    -- Connect using TLS.
    imap:setSsl(true)
    imap:setPort(993)
    local success = imap:Connect("imap.example.com")
    if success ~= true then
        print(imap:LastErrorText())

    end

    -- Authenticate
    success = imap:Login("email_account_login","email_account_password")
    if success ~= true then
        print(imap:LastErrorText())

    end

    -- Select an IMAP mailbox
    success = imap:SelectMailbox("Inbox")
    if success ~= true then
        print(imap:LastErrorText())

    end

    -- Search for messages and return a set of matching messages.
    -- (This example will simply search for ALL messages.)
    local fetchUids = true
    local messageSet = imap:Search("ALL",fetchUids)
    if imap:LastMethodSuccess() ~= true then
        print(imap:LastErrorText())

    end

    print("Number of messages = ", messageSet:Count())

    local i = 0
    while i < messageSet:Count() do
        local email = imap:FetchSingle(messageSet:GetId(i),fetchUids)
        if imap:LastMethodSuccess() ~= true then
            print(imap:LastErrorText())

        end

        print(email:From(), "; ", email:Subject())

        i = i + 1
    end

    print("OK")