Objective-C

Fetch a Set of POP3 Messages by UIDL

Demonstrates the Chilkat MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are listed in a StringTable and appends them to an EmailBundle. The arguments are the UIDL StringTable, headersOnly, numBodyLines, and the EmailBundle. This example fetches two specific messages by UIDL.

Background: This is the efficient way to download a selected subset of a mailbox in one call — exactly the pattern for an incremental client: list the mailbox UIDLs, compare against the ones you've already stored, and fetch only the new UIDLs as a set. It avoids re-downloading messages you already have while still pulling everything new in a single operation.

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Objective-C

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

BOOL success = NO;

//  Demonstrates the MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are
//  listed in a StringTable and appends them to an EmailBundle.  The arguments are the UIDL
//  StringTable, headersOnly, numBodyLines, and the EmailBundle.  The messages remain on the
//  server.

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";

//  Build the set of UIDLs to fetch.
CkoStringTable *uidls = [[CkoStringTable alloc] init];
[uidls Append: @"0000000123abcdef"];
[uidls Append: @"0000000124abcdef"];

//  Fetch the listed messages (full bodies) into a bundle.
//  headersOnly=ckfalse (fetch the entire message).
//  Note: numBodyLines only applies when headersOnly is true (it sets how many lines of the
//  body to include along with the headers).  When headersOnly is false, the entire message
//  is fetched and numBodyLines is ignored.
CkoEmailBundle *bundle = [[CkoEmailBundle alloc] init];

success = [mailman FetchUidlSet: uidls headersOnly: NO numBodyLines: [NSNumber numberWithInt: 0] bundle: bundle];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

int n = [bundle.MessageCount intValue];
NSLog(@"%@%d%@",@"Fetched ",n,@" messages.");

CkoEmail *email = [[CkoEmail alloc] init];
int i;
for (i = 0; i <= n - 1; i++) {
    success = [bundle EmailAt: [NSNumber numberWithInt: i] email: email];
    NSLog(@"%@",email.Subject);
}

//  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.