(Objective-C) Download Unread Email from IMAP Mailbox

Download unread email messages from an IMAP mailbox.

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#import <CkoImap.h>
#import <CkoMessageSet.h>
#import <NSString.h>
#import <CkoEmailBundle.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: @"admin@chilkatsoft.com" password: @"myPassword"];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

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

CkoMessageSet *messageSet = 0;
BOOL fetchUids = YES;

// Find emails marked as seen or not already seen:
NSString *seenSearch = @"SEEN";
NSString *notSeenSearch = @"NOT SEEN";

// Get the set of unseen message UIDs
messageSet = [imap Search: notSeenSearch bUid: fetchUids];
if (imap.LastMethodSuccess == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Fetch the unseen emails into a bundle object:
CkoEmailBundle *bundle = 0;
bundle = [imap FetchBundle: messageSet];
if (imap.LastMethodSuccess == NO) {

    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Display the Subject and From of each email.
int i = 0;
int numEmails = [bundle.MessageCount intValue];
while (i < numEmails) {
    CkoEmail *email = [bundle GetEmail: [NSNumber numberWithInt: i]];

    NSLog(@"%@",[email GetHeaderField: @"Date"]);
    NSLog(@"%@",email.Subject);
    NSLog(@"%@",email.From);
    NSLog(@"%@",@"--");

    i = i + 1;
}

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