(Swift) Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here.

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 assumes 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
    }

    var numFound: Int = messageSet.count.intValue
    if numFound == 0 {
        print("No messages found.")
        return
    }

    // Get the 1st 10 messages in messageSet.
    var upperBound: Int = 10
    if numFound < upperBound {
        upperBound = numFound
    }

    var i: Int = 0
    var bUid: Bool = messageSet.hasUids
    var headerOnly: Bool = true
    let email = CkoEmail()!

    while i < upperBound {

        success = imap.fetchEmail(headerOnly, msgId: messageSet.getId(i), bUid: bUid, email: email)
        if success == false {
            print("\(imap.lastErrorText!)")
            return
        }

        print("\(i): \(email.subject!)")

        i = i + 1
    }

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

}