Swift

Download the Full Version of a Partial Email

Demonstrates the Chilkat MailMan.FetchFull method, which downloads the complete version of a header-only or partial Email and stores it in a second Email. The full result includes the complete body and any attachments, and the partial email must retain its UIDL. This example previews message 1 (headers only) and then downloads it in full.

Background: A common pattern is to download headers first — cheap and fast — show the user a message list, and only pull the full content when a message is actually opened. FetchFull completes that "download on demand" flow: given a partial email (which carries its UIDL), it fetches the rest from the server. This keeps bandwidth and latency low when browsing a large mailbox.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the MailMan.FetchFull method, which downloads the complete version of a
    //  header-only or partial Email and stores it in a second Email.  The full result includes
    //  the complete body and any attachments.  The partial email must retain its UIDL.

    let mailman = CkoMailMan()!

    //  Configure the POP3 server connection.
    mailman.mailHost = "pop.example.com"
    mailman.mailPort = 995
    mailman.popSsl = true
    mailman.popUsername = "user@example.com"
    mailman.popPassword = "myPassword"

    //  First fetch message 1 as headers only (a fast preview).  headerOnly=true.
    let partialEmail = CkoEmail()!

    success = mailman.fetchOne(headerOnly: true, numBodyLines: 0, msgNum: 1, email: partialEmail)
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    print("Preview subject: \(partialEmail.subject!)")

    //  Now download the complete message (body and attachments).
    let fullEmail = CkoEmail()!
    success = mailman.fetchFull(partialEmail: partialEmail, fullEmail: fullEmail)
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    print("Full email NumAttachments: \(fullEmail.numAttachments.intValue)")

    //  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
    //  connects and authenticates -- using the property settings above -- whenever a server
    //  operation requires it.  Calling the explicit connect/authenticate methods can still be
    //  helpful to determine whether a failure occurs while connecting or while authenticating.

}