Objective-C

Fetch the UIDLs of All POP3 Messages

Demonstrates the Chilkat MailMan.FetchUidls method, which retrieves the UIDLs of the messages currently in the POP3 mailbox and stores them in a StringTable, one entry per message, in the server's current mailbox order. This example lists every UIDL.

Background: The UIDL list is the starting point for incremental mail retrieval. A client keeps a record of the UIDLs it has already downloaded; on each check it fetches the current list, computes the difference, and downloads only the new ones (see FetchUidlSet). This is how "leave a copy on the server" works without repeatedly re-downloading the same messages.

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Objective-C

#import <CkoMailMan.h>
#import <CkoStringTable.h>

BOOL success = NO;

//  Demonstrates the MailMan.FetchUidls method, which retrieves the UIDLs of the messages
//  currently in the POP3 mailbox and stores them in a StringTable, one entry per message, in
//  the server's current mailbox order.

CkoMailMan *mailman = [[CkoMailMan alloc] init];

//  Configure the POP3 server connection.
mailman.MailHost = @"pop.example.com";
mailman.MailPort = [NSNumber numberWithInt:995];
mailman.PopSsl = YES;
mailman.PopUsername = @"user@example.com";
mailman.PopPassword = @"myPassword";

//  Retrieve the UIDLs of all messages in the mailbox.
CkoStringTable *uidls = [[CkoStringTable alloc] init];

success = [mailman FetchUidls: uidls];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

int n = [uidls.Count intValue];
NSLog(@"%@%d%@",@"Mailbox contains ",n,@" messages.");

int i;
for (i = 0; i <= n - 1; i++) {
    NSLog(@"%@%d%@%@",@"UIDL ",i,@": ",[uidls StringAt: [NSNumber numberWithInt: i]]);
}

//  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
//  connects and authenticates -- using the property settings above -- whenever a server
//  operation requires it.  Calling the explicit connect/authenticate methods can still be
//  helpful to determine whether a failure occurs while connecting or while authenticating.