(Swift 3,4,5...) Scan for Emails with Attachments and Save Attachments to Files

Scan for emails with attachments and save attachments.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let imap = CkoImap()!

    // Connect to an IMAP server.
    // Use TLS
    imap.ssl = true
    imap.port = 993
    var success: Bool = imap.connect("imap.someMailServer.com")
    if success != true {
        print("\(imap.lastErrorText!)")
        return
    }

    // Login
    success = imap.login("myLogin", password: "myPassword")
    if success != true {
        print("\(imap.lastErrorText!)")
        return
    }

    // Select an IMAP mailbox
    success = imap.selectMailbox("Inbox")
    if success != true {
        print("\(imap.lastErrorText!)")
        return
    }

    var messageSet: CkoMessageSet?
    // We can choose to fetch UIDs or sequence numbers.
    var fetchUids: Bool = true

    // Get the message IDs of all the emails in the mailbox
    messageSet = imap.search("ALL", bUid: fetchUids)
    if imap.lastMethodSuccess != true {
        print("\(imap.lastErrorText!)")
        return
    }

    // Fetch the email headers into a bundle object:
    var bundle: CkoEmailBundle?
    bundle = imap.fetchHeaders(messageSet)
    if imap.lastMethodSuccess != true {
        messageSet = nil
        print("\(imap.lastErrorText!)")
        return
    }

    // Scan for emails with attachments, and save the attachments
    // to a sub-directory.
    var i: Int
    for i = 0; i <= bundle!.messageCount.intValue - 1; i++ {
        var email: CkoEmail?
        email = bundle!.getEmail(i)

        // Does this email have attachments?
        // Use GetMailNumAttach because the attachments
        // are not actually in the email object because
        // we only downloaded headers.
        // (Had we downloaded the full emails by
        // calling mailman.FetchBundle, we could look
        // at the email object's NumAttachments property.)
        var numAttach: Int = imap.getMailNumAttach(email).intValue

        if numAttach > 0 {
            // Download the entire email and save the
            // attachments. (Remember, we 
            // need to download the entire email because
            // only the headers were previously downloaded.
            // If the entire emails were downloaded by
            // calling FetchBundle instead of FetchHeaders,
            // this would not be necessary.

            // The ckx-imap-uid header field is added when
            // headers are downloaded.  This makes it possible
            // to get the UID from the email object.
            var uidStr: String? = email!.getHeaderField("ckx-imap-uid")
            var uid: Int = [uidStr intValue]

            var fullEmail: CkoEmail?
            fullEmail = imap.fetchSingle(uid, bUid: true)
            if imap.lastMethodSuccess == true {
                success = fullEmail!.saveAllAttachments("attachmentsDir")
                fullEmail = nil
            }

            var j: Int
            for j = 0; j <= numAttach - 1; j++ {
                var filename: String? = imap.getMailAttachFilename(email, attachIndex: j)
                print("\(filename!)")
            }

        }

        email = nil
    }

    // Disconnect from the IMAP server.
    success = imap.disconnect()

    messageSet = nil
    bundle = nil

}