(Objective-C) Mark IMAP Email as Read/Unread (Seen/Unseen)

Demonstrates how to mark emails as read or unread.

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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: @"imap.someMailServer.com"];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

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

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

// Set PeekMode so that downloaded messages are not
// automatically marked as seen.
imap.PeekMode = YES;

// The NumMessages property contains the number of messages 
// in the currently selected mailbox.
int numMsgs = [imap.NumMessages intValue];
if (numMsgs == 0) {
    return;
}

int i;
for (i = 1; i <= numMsgs; i++) {
    // Download each email by sequence number (not UID)
    CkoEmail *email = 0;
    email = [imap FetchSingle: [NSNumber numberWithInt: i] bUid: NO];
    if (imap.LastMethodSuccess == NO) {
        NSLog(@"%@",imap.LastErrorText);
        return;
    }

    // If desired, mark the email as SEEN.  There are two
    // ways to do it:

    // 1) Set the flag directly by using the sequence number
    // Indicate that we are passing a sequence number and
    // not a UID:
    BOOL bIsUid = NO;
    // Set the SEEN flag = 1 to mark the email as SEEN,
    // or set it to 0 to mark it as not-seen.
    success = [imap SetFlag: [NSNumber numberWithInt: i] bUid: bIsUid flagName: @"SEEN" value: [NSNumber numberWithInt: 1]];
    if (success != YES) {
        NSLog(@"%@",imap.LastErrorText);
        return;
    }

    // 2) Alternatively, we can use the email object.
    // When an email is downloaded from the IMAP server
    // Chilkat will add a "ckx-imap-uid" header to the email.
    // This makes it possible to know the UID associated with
    // the email.  (This is not the sequence number, which may change
    // from session to session, but the UID which does not change.
    // The SetMailFlag method is identical to SetFlag, except
    // it gets the UID from the ckx-imap-uid header.
    // For example:
    success = [imap SetMailFlag: email flagName: @"SEEN" value: [NSNumber numberWithInt: 1]];
    if (success != YES) {
        NSLog(@"%@",imap.LastErrorText);
        return;
    }

}

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