Objective-C

Download the Full Version of a Partial Email

Demonstrates the Chilkat MailMan.FetchFull method, which downloads the complete version of a header-only or partial Email and stores it in a second Email. The full result includes the complete body and any attachments, and the partial email must retain its UIDL. This example previews message 1 (headers only) and then downloads it in full.

Background: A common pattern is to download headers first — cheap and fast — show the user a message list, and only pull the full content when a message is actually opened. FetchFull completes that "download on demand" flow: given a partial email (which carries its UIDL), it fetches the rest from the server. This keeps bandwidth and latency low when browsing a large mailbox.

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Objective-C

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

BOOL success = NO;

//  Demonstrates the MailMan.FetchFull method, which downloads the complete version of a
//  header-only or partial Email and stores it in a second Email.  The full result includes
//  the complete body and any attachments.  The partial email must retain its UIDL.

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";

//  First fetch message 1 as headers only (a fast preview).  headerOnly=cktrue.
CkoEmail *partialEmail = [[CkoEmail alloc] init];

success = [mailman FetchOne: YES numBodyLines: [NSNumber numberWithInt: 0] msgNum: [NSNumber numberWithInt: 1] email: partialEmail];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

NSLog(@"%@%@",@"Preview subject: ",partialEmail.Subject);

//  Now download the complete message (body and attachments).
CkoEmail *fullEmail = [[CkoEmail alloc] init];
success = [mailman FetchFull: partialEmail fullEmail: fullEmail];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Full email NumAttachments: ",[fullEmail.NumAttachments intValue]);

//  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.