Objective-C

Get the IMAP UID of an Email

Demonstrates the Chilkat Email.GetImapUid method. When email headers are downloaded from an IMAP server using Chilkat IMAP, a ckx-imap-uid header field is added to the email, and GetImapUid returns its value. This example sets that header directly to illustrate how the method reads it.

Background: IMAP assigns each message in a mailbox a UID — a stable numeric identifier used to fetch, flag, move, or delete that specific message. Chilkat records it in the ckx-imap-uid header so it stays attached to the downloaded Email object. This is the IMAP counterpart to POP3's UIDL (see the Uidl property), letting an application correlate a local message back to its position on the server.

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Objective-C

#import <CkoEmail.h>

//  Demonstrates the GetImapUid method.  When an email is downloaded from an IMAP server
//  (using Chilkat IMAP), a ckx-imap-uid header field is added, and GetImapUid returns its
//  value.  Here we set the header directly to show how the method reads it.

CkoEmail *email = [[CkoEmail alloc] init];
email.Subject = @"GetImapUid example";

//  Normally the IMAP download sets this header; we set it here for demonstration.
[email AddHeaderField: @"ckx-imap-uid" fieldValue: @"482"];

NSLog(@"%@%d",@"IMAP UID = ",[email GetImapUid]);