(Objective-C) Process New Email by Scanning for Senders

Scan email and save application-selected emails to EML files with unique filenames.

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

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#import <CkoImap.h>
#import <CkoMessageSet.h>
#import <CkoEmailBundle.h>
#import <CkoEmail.h>
#import <NSString.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.someMailServer.com"];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

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

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

// We can choose to fetch UIDs or sequence numbers.
BOOL fetchUids = YES;

// Fetch messages from the mailbox using a search criteria.
// This example finds NEW emails: these are emails that have the RECENT flag set, but not the SEEN flag:
CkoMessageSet *messageSet = [[CkoMessageSet alloc] init];
success = [imap QueryMbx: @"NEW" bUid: fetchUids msgSet: messageSet];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// This example will download headers, and then download
// the full email for those emails sent from a contact
// in our database.

// When downloading headers, each email object contains
// (obviously) the headers, but the body will be missing.
// Also, attachments will not be included.  However, it is
// possible to get information about the attachments
// as well as the complete size of the email.
CkoEmailBundle *bundle = [[CkoEmailBundle alloc] init];
BOOL headersOnly = YES;
success = [imap FetchMsgSet: headersOnly msgSet: messageSet bundle: bundle];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Loop over the email objects...
CkoEmail *emailHeader = [[CkoEmail alloc] init];
CkoEmail *fullEmail = [[CkoEmail alloc] init];
int i = 0;
int numEmails = [bundle.MessageCount intValue];
while (i < numEmails) {
    [bundle EmailAt: [NSNumber numberWithInt: i] email: emailHeader];

    // The sender's email address and name are available
    // in the From, FromAddress, and FromName properties.
    // If the sender is "Chilkat Support <support@chilkatsoft.com",
    // then the From property will hold the entire string.
    // the FromName property contains"Chilkat Support",
    // and the FromAddress property contains "support@chilkatsoft.com"
    NSLog(@"%@",emailHeader.From);
    NSLog(@"%@",emailHeader.FromAddress);
    NSLog(@"%@",emailHeader.FromName);

    // Assume at this point your code checks to see if the sender
    // is one in your contacts database.  If so, this is
    // the code you would write to download the entire
    // email and save it to a file.

    // The ckx-imap-uid header field is added when
    // headers are downloaded.  This makes it possible
    // to get the UID from the email object.
    NSString *uidStr = [emailHeader GetHeaderField: @"ckx-imap-uid"];
    int uid = [uidStr intValue];

    success = [imap FetchEmail: NO msgId: uid bUid: YES email: fullEmail];
    if (success == NO) {
        NSLog(@"%@",imap.LastErrorText);
        return;
    }

    // You can use the GenerateFilename method to
    // generate a unique filename...
    NSString *filename = [fullEmail GenerateFilename];

    // SaveEml saves the entire email, including attachments.
    success = [fullEmail SaveEml: filename];

    NSLog(@"%@",@"--");

    i = i + 1;
}

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