(IOS) 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.

Download: Chilkat IOS (IPhone) Objective-C Libraries

NSMutableString *strOutput = [NSMutableString stringWithCapacity:1000];

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

BOOL success;

//  Anything unlocks the component and begins a fully-functional 30-day trial.
success = [imap UnlockComponent: @"Anything for 30-day trial"];
if (success != YES) {
    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

//  Connect to an IMAP server.
success = [imap Connect: @"mail.chilkatsoft.com"];
if (success != YES) {
    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

//  Login
success = [imap Login: @"****" password: @"****"];
if (success != YES) {
    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

//  Select an IMAP mailbox
success = [imap SelectMailbox: @"Inbox"];
if (success != YES) {
    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

CkoMessageSet *messageSet;
//  We can choose to fetch UIDs or sequence numbers.
BOOL fetchUids;
fetchUids = YES;
//  Get the message IDs of all the emails in the mailbox
messageSet = [imap Search: @"ALL" bUid: fetchUids];
if (messageSet == nil ) {
    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

int numFound;
numFound = [messageSet.Count intValue];
if (numFound == 0) {
    [strOutput appendString: @"No messages found."];
    [strOutput appendString: @"\n"];

    self.mainTextField.stringValue = strOutput;
    return;
}

//  Get the 1st 10 messages in messageSet.
int maxToGet;
maxToGet = 10;

int upperBound;
upperBound = 10;
if (numFound < upperBound) {
    upperBound = numFound;
}

int i;
BOOL bUid;
bUid = messageSet.HasUids;
for (i = 0; i <= upperBound - 1; i++) {

    CkoEmail *email;
    email = [imap FetchSingleHeader: [messageSet GetId: [NSNumber numberWithInt: i]] bUid: bUid];
    if (email == nil ) {
        [strOutput appendString: imap.LastErrorText];
        [strOutput appendString: @"\n"];

        self.mainTextField.stringValue = strOutput;
        return;

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

    }

}

//  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] autorelease];

for (i = 0; i <= upperBound - 1; i++) {
    [firstTen InsertId: [messageSet GetId: [NSNumber numberWithInt: i]](ERROR: No argument at index 1: MessageSet:InsertId);
}

//  Download the 1st ten headers:
CkoEmailBundle *bundle;
bundle = [imap FetchHeaders: firstTen];
if (bundle == nil ) {

    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

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

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



self.mainTextField.stringValue = strOutput;