(Objective-C) Scan for Emails with Attachments and Save Attachments to Files

Scan for emails with attachments and save attachments.

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 requires 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: @"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;

// Get the message IDs of all the emails in the mailbox
CkoMessageSet *messageSet = [[CkoMessageSet alloc] init];
success = [imap QueryMbx: @"ALL" bUid: fetchUids msgSet: messageSet];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Fetch the email headers into a bundle object:
CkoEmailBundle *bundle = [[CkoEmailBundle alloc] init];
BOOL headersOnly = YES;
success = [imap FetchMsgSet: headersOnly msgSet: messageSet bundle: bundle];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

// Scan for emails with attachments, and save the attachments
// to a sub-directory.
CkoEmail *fullEmail = [[CkoEmail alloc] init];
CkoEmail *emailHeader = [[CkoEmail alloc] init];
int i = 0;
while (i < [bundle.MessageCount intValue]) {
    // The bundle contains email headers..
    [bundle EmailAt: [NSNumber numberWithInt: i] email: emailHeader];

    // Does this email have attachments?
    // Use GetMailNumAttach because the attachments
    // are not actually in the email object because
    // we only downloaded headers.
    int numAttach = [[imap GetMailNumAttach: emailHeader] intValue];

    if (numAttach > 0) {
        // Download the entire email and save the
        // attachments. (Remember, we 
        // need to download the entire email because
        // only the headers were previously downloaded.

        // 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;
        }

        success = [fullEmail SaveAllAttachments: @"attachmentsDir"];

        int j;
        for (j = 0; j <= numAttach - 1; j++) {
            NSString *filename = [imap GetMailAttachFilename: emailHeader attachIndex: [NSNumber numberWithInt: j]];
            NSLog(@"%@",filename);
        }

    }

    i = i + 1;
}

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