(C++) Process Large POP3 Mailbox

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

Chilkat C/C++ Library Downloads
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#include <CkMailMan.h>
#include <CkStringArray.h>
#include <CkEmailBundle.h>

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

    CkMailMan mailman;

    mailman.put_MailHost("pop.example.com");

    mailman.put_PopUsername("myLogin");
    mailman.put_PopPassword("myPassword");

    mailman.put_MailPort(995);
    mailman.put_PopSsl(true);

    // Get the list of UIDLs for all emails in the mailbox.
    CkStringArray *sa = mailman.GetUidls();
    if (mailman.get_LastMethodSuccess() == false) {
        std::cout << mailman.lastErrorText() << "\r\n";
        return;
    }

    int i;
    int numEmails = sa->get_Count();
    if (numEmails == 0) {
        std::cout << "Mailbox is empty" << "\r\n";
        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;
    }

    CkStringArray saChunk;
    while ((chunkBeginIdx < numEmails)) {

        std::cout << chunkBeginIdx << " to " << chunkEndIdx << "\r\n";

        // Build a chunk of UIDLs.
        saChunk.Clear();
        for (i = chunkBeginIdx; i <= chunkEndIdx; i++) {
            saChunk.Append(sa->getString(i));
        }

        // Log the UIDLs in this chunk...
        const char *chunkStr = saChunk.saveToText();
        std::cout << chunkStr << "\r\n";

        // Download this chunk of email from the POP3 server.
        CkEmailBundle *bundle = mailman.FetchMultiple(saChunk);
        if (mailman.get_LastMethodSuccess() == false) {
            std::cout << mailman.lastErrorText() << "\r\n";
            return;
        }

        std::cout << "Downloaded " << bundle->get_MessageCount() << " emails." << "\r\n";
        std::cout << "----" << "\r\n";

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

        delete bundle;

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

    }

    delete sa;
    }