(Unicode C++) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

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#include <CkImapW.h>
#include <CkMessageSetW.h>
#include <CkEmailW.h>

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

    CkImapW imap;

    // Connect using TLS.
    imap.put_Ssl(true);
    imap.put_Port(993);
    bool success = imap.Connect(L"imap.example.com");
    if (success != true) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }

    // Authenticate
    success = imap.Login(L"email_account_login",L"email_account_password");
    if (success != true) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }

    // Select an IMAP mailbox
    success = imap.SelectMailbox(L"Inbox");
    if (success != true) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }

    // Search for messages and return a set of matching messages.
    // (This example will simply search for ALL messages.)
    bool fetchUids = true;
    CkMessageSetW *messageSet = imap.Search(L"ALL",fetchUids);
    if (imap.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }

    wprintf(L"Number of messages = %d\n",messageSet->get_Count());

    int i = 0;
    while (i < messageSet->get_Count()) {
        CkEmailW *email = imap.FetchSingle(messageSet->GetId(i),fetchUids);
        if (imap.get_LastMethodSuccess() != true) {
            wprintf(L"%s\n",imap.lastErrorText());
            delete messageSet;
            return;
        }

        wprintf(L"%s; %s\n",email->ck_from(),email->subject());
        delete email;

        i = i + 1;
    }

    delete messageSet;

    wprintf(L"OK\n");
    }