(Swift 3,4,5...) Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

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("****", password: "****")
    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
    }

    // When downloading headers, each email object contains
    // (obviously) the headers, but the body will be missing.
    // Also, attachments will not be included.  However, it is
    // possible to get information about the attachments
    // as well as the complete size of the email.
    var bundle: CkoEmailBundle?
    bundle = imap.fetchHeaders(messageSet)
    if imap.lastMethodSuccess != true {
        messageSet = nil
        print("\(imap.lastErrorText!)")
        return
    }

    // Loop over the email objects and display information
    // about each:
    var i: Int
    for i = 0; i <= bundle!.messageCount.intValue - 1; i++ {
        var email: CkoEmail?
        email = bundle!.getEmail(i)

        // Display the From and Subject
        print("\(email!.from!)")
        print("\(email!.subject!)")

        // Display the recipients:
        var j: Int
        var name: String?
        var addr: String?
        for j = 0; j <= email!.numTo.intValue - 1; j++ {
            name = email!.getToName(j)
            addr = email!.getToAddr(j)
            print("\(name!), \(addr!)")
        }

        for j = 0; j <= email!.numCC.intValue - 1; j++ {
            name = email!.getCcName(j)
            addr = email!.getCcAddr(j)
            print("\(name!), \(addr!)")
        }

        // Show the total size of the email, including body and attachments:
        print("\(email!.size.intValue)")

        // When a full email is downloaded, we would use the
        // email.NumAttachments property in conjunction with the
        // email.GetMailAttach* methods.
        // However, when an email object contains only the header,
        // we need to access the attachment info differently:
        var numAttach: Int = imap.getMailNumAttach(email).intValue
        for j = 0; j <= numAttach - 1; j++ {
            print("\(imap.getMailAttachFilename(email, attachIndex: j)!)")
            var attachSize: Int = imap.getMailAttachSize(email, attachIndex: j).intValue
            print("    size = \(attachSize) bytes")
        }

        print("--")
        email = nil
    }

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

    messageSet = nil
    bundle = nil

}