(Unicode 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 <CkMailManW.h>
#include <CkStringArrayW.h>
#include <CkEmailBundleW.h>

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

    CkMailManW mailman;

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

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

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

    // Get the list of UIDLs for all emails in the mailbox.
    CkStringArrayW *sa = mailman.GetUidls();
    if (mailman.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",mailman.lastErrorText());
        return;
    }

    int i;
    int numEmails = sa->get_Count();
    if (numEmails == 0) {
        wprintf(L"Mailbox is empty\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;
    }

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

        wprintf(L"%d to %d\n",chunkBeginIdx,chunkEndIdx);

        // 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 wchar_t *chunkStr = saChunk.saveToText();
        wprintf(L"%s\n",chunkStr);

        // Download this chunk of email from the POP3 server.
        CkEmailBundleW *bundle = mailman.FetchMultiple(saChunk);
        if (mailman.get_LastMethodSuccess() == false) {
            wprintf(L"%s\n",mailman.lastErrorText());
            return;
        }

        wprintf(L"Downloaded %d emails.\n",bundle->get_MessageCount());
        wprintf(L"----\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;
    }