(Objective-C) Process Large POP3 Mailbox

Demonstrates how to read email from a mailbox that may contain a large number of emails.

Chilkat Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

#import <CkoMailMan.h>
#import <CkoStringArray.h>
#import <NSString.h>
#import <CkoEmailBundle.h>

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

CkoMailMan *mailman = [[CkoMailMan alloc] init];

mailman.MailHost = @"pop.example.com";

mailman.PopUsername = @"myLogin";
mailman.PopPassword = @"myPassword";

mailman.MailPort = [NSNumber numberWithInt:995];
mailman.PopSsl = YES;

// Get the list of UIDLs for all emails in the mailbox.
CkoStringArray *sa = [mailman GetUidls];
if (mailman.LastMethodSuccess == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

int i;
int numEmails = [sa.Count intValue];
if (numEmails == 0) {
    NSLog(@"%@",@"Mailbox is empty");
    return;
}

int chunkSize = 6;

// Download the emails in chunks of 6 emails each.
int chunkBeginIdx = 0;
int chunkEndIdx = chunkSize - 1;
if (chunkEndIdx >= numEmails) {
    chunkEndIdx = numEmails - 1;
}

CkoStringArray *saChunk = [[CkoStringArray alloc] init];
while ((chunkBeginIdx < numEmails)) {

    NSLog(@"%d%@%d",chunkBeginIdx,@" to ",chunkEndIdx);

    // Build a chunk of UIDLs.
    [saChunk Clear];
    for (i = chunkBeginIdx; i <= chunkEndIdx; i++) {
        [saChunk Append: [sa GetString: [NSNumber numberWithInt: i]]];
    }

    // Log the UIDLs in this chunk...
    NSString *chunkStr = [saChunk SaveToText];
    NSLog(@"%@",chunkStr);

    // Download this chunk of email from the POP3 server.
    CkoEmailBundle *bundle = [mailman FetchMultiple: saChunk];
    if (mailman.LastMethodSuccess == NO) {
        NSLog(@"%@",mailman.LastErrorText);
        return;
    }

    NSLog(@"%@%d%@",@"Downloaded ",[bundle.MessageCount intValue],@" emails.");
    NSLog(@"%@",@"----");

    // Process the bundle...
    // (your application's processing code goes here...)

    // Get the next chunk...
    chunkBeginIdx = chunkBeginIdx + chunkSize;
    chunkEndIdx = chunkEndIdx + chunkSize;
    if (chunkEndIdx >= numEmails) {
        chunkEndIdx = numEmails - 1;
    }

}