(Swift) Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

Note: This example requires Chilkat v11.0.0 or greater.

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

func chilkatTest() {
    var success: Bool = false

    // 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
    success = imap.connect("imap.example.com")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

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

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

    // Get the message IDs of all the emails in the mailbox
    // We can choose to fetch UIDs or sequence numbers.
    var fetchUids: Bool = true
    let messageSet = CkoMessageSet()!
    success = imap.queryMbx("ALL", bUid: fetchUids, msgSet: messageSet)
    if success == false {
        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.
    let bundle = CkoEmailBundle()!
    var headersOnly: Bool = true
    success = imap.fetchMsgSet(headersOnly, msgSet: messageSet, bundle: bundle)
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    // Loop over the email objects and display information
    // about each:
    let email = CkoEmail()!
    var name: String?
    var addr: String?
    var i: Int = 0
    var j: Int = 0
    while i < bundle.messageCount.intValue {
        bundle.email(at: i, email: email)

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

        // Display the recipients:
        j = 0
        while j < email.numTo.intValue {
            print("TO: \(email.getToName(j)!), \(email.getToAddr(j)!)")
            j = j + 1
        }

        j = 0
        while j < email.numCC.intValue {
            print("CC: \(email.getCcName(j)!), \(email.getCcAddr(j)!)")
            j = j + 1
        }

        // 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
        j = 0
        while j < numAttach {
            print("\(imap.getMailAttachFilename(email, attachIndex: j)!)")
            var attachSize: Int = imap.getMailAttachSize(email, attachIndex: j).intValue
            print("    size = \(attachSize) bytes")
            j = j + 1
        }

        print("--")
    }

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

}