(Objective-C) Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here.

Note: This example requires Chilkat v11.0.0 or greater.

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

BOOL success = NO;

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

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

// Connect to an IMAP server.
// Use TLS
imap.Ssl = YES;
imap.Port = [NSNumber numberWithInt:993];
success = [imap Connect: @"imap.example.com"];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Login
success = [imap Login: @"****" password: @"****"];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Select an IMAP mailbox
success = [imap SelectMailbox: @"Inbox"];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

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

int numFound = [messageSet.Count intValue];
if (numFound == 0) {
    NSLog(@"%@",@"No messages found.");
    return;
}

// Get the 1st 10 messages in messageSet.
int upperBound = 10;
if (numFound < upperBound) {
    upperBound = numFound;
}

int i = 0;
BOOL bUid = messageSet.HasUids;
BOOL headerOnly = YES;
CkoEmail *email = [[CkoEmail alloc] init];

while (i < upperBound) {

    success = [imap FetchEmail: headerOnly msgId: [messageSet GetId: [NSNumber numberWithInt: i]] bUid: bUid email: email];
    if (success == NO) {
        NSLog(@"%@",imap.LastErrorText);
        return;
    }

    NSLog(@"%d%@%@",i,@": ",email.Subject);

    i = i + 1;
}

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