(Unicode C) Process Large POP3 Mailbox

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

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#include <C_CkMailManW.h>
#include <C_CkStringArrayW.h>
#include <C_CkEmailBundleW.h>

void ChilkatSample(void)
    {
    HCkMailManW mailman;
    HCkStringArrayW sa;
    int i;
    int numEmails;
    int chunkSize;
    int chunkBeginIdx;
    int chunkEndIdx;
    HCkStringArrayW saChunk;
    const wchar_t *chunkStr;
    HCkEmailBundleW bundle;

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

    mailman = CkMailManW_Create();

    CkMailManW_putMailHost(mailman,L"pop.example.com");

    CkMailManW_putPopUsername(mailman,L"myLogin");
    CkMailManW_putPopPassword(mailman,L"myPassword");

    CkMailManW_putMailPort(mailman,995);
    CkMailManW_putPopSsl(mailman,TRUE);

    // Get the list of UIDLs for all emails in the mailbox.
    sa = CkMailManW_GetUidls(mailman);
    if (CkMailManW_getLastMethodSuccess(mailman) == FALSE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        return;
    }

    numEmails = CkStringArrayW_getCount(sa);
    if (numEmails == 0) {
        wprintf(L"Mailbox is empty\n");
        CkMailManW_Dispose(mailman);
        return;
    }

    chunkSize = 6;

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

    saChunk = CkStringArrayW_Create();
    while ((chunkBeginIdx < numEmails)) {

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

        // Build a chunk of UIDLs.
        CkStringArrayW_Clear(saChunk);
        for (i = chunkBeginIdx; i <= chunkEndIdx; i++) {
            CkStringArrayW_Append(saChunk,CkStringArrayW_getString(sa,i));
        }

        // Log the UIDLs in this chunk...
        chunkStr = CkStringArrayW_saveToText(saChunk);
        wprintf(L"%s\n",chunkStr);

        // Download this chunk of email from the POP3 server.
        bundle = CkMailManW_FetchMultiple(mailman,saChunk);
        if (CkMailManW_getLastMethodSuccess(mailman) == FALSE) {
            wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
            CkMailManW_Dispose(mailman);
            CkStringArrayW_Dispose(saChunk);
            return;
        }

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

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

        CkEmailBundleW_Dispose(bundle);

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

    }

    CkStringArrayW_Dispose(sa);


    CkMailManW_Dispose(mailman);
    CkStringArrayW_Dispose(saChunk);

    }