(Objective-C) Delete All IMAP Email

Demonstrates two ways to delete all email in a mailbox on an IMAP server.

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

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

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

// Turn on session logging:
imap.KeepSessionLog = YES;

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

CkoMessageSet *messageSet = 0;

// Get the complete set of Uids for email in the selected mailbox.
messageSet = [imap GetAllUids];
if (imap.LastMethodSuccess != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Set the Deleted flag for each message.
// (ExpungeAndClose must be called to finalize the delete.)
success = [imap SetFlags: messageSet flagName: @"Deleted" value: [NSNumber numberWithInt: 1]];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Alternatively, the Deleted flag may be set for each UID
// individiually, but this is less efficient:
int i;
int n = [messageSet.Count intValue];
for (i = 0; i <= n - 1; i++) {
    success = [imap SetFlag: [messageSet GetId: [NSNumber numberWithInt: i]] bUid: messageSet.HasUids flagName: @"Deleted" value: [NSNumber numberWithInt: 1]];
    if (success != YES) {
        NSLog(@"%@",imap.LastErrorText);
        return;
    }

}

// Expunge and close the mailbox.
success = [imap ExpungeAndClose];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Display the session log.
NSLog(@"%@",imap.SessionLog);

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