(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.

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

// 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];
BOOL success = [imap Connect: @"imap.someMailServer.com"];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Login
success = [imap Login: @"****" password: @"****"];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Select an IMAP mailbox
success = [imap SelectMailbox: @"Inbox"];
if (success != YES) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

CkoMessageSet *messageSet = 0;
// We can choose to fetch UIDs or sequence numbers.
BOOL fetchUids = YES;
// Get the message IDs of all the emails in the mailbox
messageSet = [imap Search: @"ALL" bUid: fetchUids];
if (imap.LastMethodSuccess == 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;
while (i < upperBound) {

    CkoEmail *email = [imap FetchSingleHeader: [messageSet GetId: [NSNumber numberWithInt: i]] bUid: bUid];
    if (imap.LastMethodSuccess == NO) {
        NSLog(@"%@",imap.LastErrorText);

        return;

    }
    else {
        // Do whatever is needed with the email.. 
        // ....

    }

    i = i + 1;
}

// Alternatively, create a new message set containing the 1st 10 message id's (UID's) 
// from the search results message set:
CkoMessageSet *firstTen = [[CkoMessageSet alloc] init];

for (i = 0; i <= upperBound - 1; i++) {
    [firstTen InsertId: [messageSet GetId: [NSNumber numberWithInt: i]]];
}

// Download the 1st ten headers:
CkoEmailBundle *bundle = 0;
bundle = [imap FetchHeaders: firstTen];
if (imap.LastMethodSuccess == NO) {

    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Other examples show how to iterate over the emails contained within the bundle...

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