Swift

Fetch a Text IMAP Attachment as a String

Demonstrates the Chilkat Imap.FetchAttachmentString method, which returns one text attachment decoded to a string. The first argument is the Email, the second is the zero-based attachment index, and the third is the charset used to decode the bytes. This example returns the first attachment as a UTF-8 string.

Background: This is the convenient form when you simply want a small text attachment's content inline as a string. Only use it for attachments known to be text; decoding binary content through a charset can alter or corrupt the bytes. For binary data use FetchAttachmentBd, and for large text a StringBuilder (via FetchAttachmentSb) avoids an extra copy.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the Imap.FetchAttachmentString method, which downloads one text attachment and
    //  returns it decoded to a string.  The 1st argument is the Email, the 2nd is the zero-based
    //  attachment index, and the 3rd is the charset used to decode the bytes.
    //  
    //  The message is fetched headers-only, then the attachment is downloaded on demand.

    let imap = CkoImap()!

    imap.ssl = true
    imap.port = 993

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

    success = imap.login(login: "user@example.com", password: "myPassword")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    success = imap.selectMailbox(mailbox: "Inbox")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    //  Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
    //  metadata describing the attachments is present, so the attachment info methods still work.
    var headersOnly: Bool = true
    var useUid: Bool = false
    var seqNum: Int = 1
    let email = CkoEmail()!
    success = imap.fetchEmail(headerOnly: headersOnly, msgId: seqNum, bUid: useUid, email: email)
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    var numAttach: Int = imap.getMailNumAttach(email: email).intValue
    if numAttach > 0 {
        //  FetchAttachmentString returns a string, so assign it to a string variable.
        var attachText: String? = imap.fetchAttachmentString(email: email, attachIndex: 0, charset: "utf-8")
        if imap.lastMethodSuccess == false {
            print("\(imap.lastErrorText!)")
            return
        }

        print("\(attachText!)")
    }

    success = imap.disconnect()
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }


}