(Objective-C) IMAP STARTTLS (Explicit TLS/SSL)

The StartTls property is set to force the Connect method to automatically convert an connection to TLS/SSL via the STARTTLS IMAP command.

This is also known as "explicit TLS/SSL" as opposed to "implicit TLS/SSL". With implicit TLS/SSL, the IMAP client connects on the well-known IMAP TLS/SSL port 993 and the secure channel is immediately established. With explicit TLS/SSL, the IMAP client connects on the typical non-secure port (143 usually) and the converts the connection via the STARTTLS command.

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#import <CkoImap.h>
#import <CkoMessageSet.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];

// Indicate that STARTTLS should be used to convert
// to a secure TLS/SSL connection:
imap.StartTls = YES;
imap.Port = [NSNumber numberWithInt:143];

// Connect to an IMAP server and convert the connection
// to TLS/SSL via STARTTLS.
BOOL success = [imap Connect: @"imap.someMailServer.com"];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// The remainder of this example is the same as for 
// non-TLS/SSL...

// 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;
}

CkoMessageSet *messageSet = 0;
// We can choose to fetch UIDs or sequence numbers.
BOOL fetchUids = YES;
// Get the message IDs of all the emails in the mailbox
messageSet = [imap Search: @"ALL" bUid: fetchUids];
if (imap.LastMethodSuccess == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

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

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

// Loop over the bundle and display the FROM and SUBJECT of each.
int i = 0;
int numEmails = [bundle.MessageCount intValue];
while (i < numEmails) {
    CkoEmail *email = [bundle GetEmail: [NSNumber numberWithInt: i]];
    NSLog(@"%@",email.From);
    NSLog(@"%@",email.Subject);
    NSLog(@"%@",@"--");

    i = i + 1;
}

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