(Objective-C) Fetch Oldest/Newest IMAP Email

Emails may be downloaded by sequence number. Assuming the selected mailbox is not empty, the oldest email is at sequence number 1, and the newest email is at sequence number N. The FetchSingle method may be used to download by sequence number.

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#import <CkoImap.h>
#import <CkoEmail.h>

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoImap *imap = [[CkoImap alloc] init];

// Connect to an IMAP server.
// Use TLS
imap.Ssl = YES;
imap.Port = [NSNumber numberWithInt:993];
BOOL success = [imap Connect: @"mail.testemail.net"];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Login
success = [imap Login: @"***" password: @"***"];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Select an IMAP mailbox
success = [imap SelectMailbox: @"Inbox"];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// After selecting a mailbox, the NumMessages property
// contains the number of emails in the selected mailbox.
int n;
n = [imap.NumMessages intValue];

if (n > 0) {

    // The oldest email is always at sequence number 1.
    BOOL isUid = NO;

    CkoEmail *oldestEmail = 0;
    oldestEmail = [imap FetchSingle: [NSNumber numberWithInt: 1] bUid: isUid];
    if (imap.LastMethodSuccess == YES) {

        // Display the From and Subject
        NSLog(@"%@",oldestEmail.FromAddress);
        NSLog(@"%@",oldestEmail.Subject);

        NSLog(@"%@",@"--");

    }

    // The newest email is at sequence number N:
    CkoEmail *newestEmail = 0;
    newestEmail = [imap FetchSingle: [NSNumber numberWithInt: n] bUid: isUid];
    if (imap.LastMethodSuccess == YES) {

        // Display the From and Subject
        NSLog(@"%@",newestEmail.FromAddress);
        NSLog(@"%@",newestEmail.Subject);

    }

}

// Disconnect from the IMAP server.
success = [imap Disconnect];