(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.

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <CkImap.h>
#include <CkMessageSet.h>
#include <CkEmail.h>

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

    CkImap imap;

    // Connect using TLS.
    imap.put_Ssl(true);
    imap.put_Port(993);
    bool success = imap.Connect("imap.example.com");
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // Authenticate
    success = imap.Login("email_account_login","email_account_password");
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // Search for messages and return a set of matching messages.
    // (This example will simply search for ALL messages.)
    bool fetchUids = true;
    CkMessageSet *messageSet = imap.Search("ALL",fetchUids);
    if (imap.get_LastMethodSuccess() != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Number of messages = " << messageSet->get_Count() << "\r\n";

    int i = 0;
    while (i < messageSet->get_Count()) {
        CkEmail *email = imap.FetchSingle(messageSet->GetId(i),fetchUids);
        if (imap.get_LastMethodSuccess() != true) {
            std::cout << imap.lastErrorText() << "\r\n";
            delete messageSet;
            return;
        }

        std::cout << email->ck_from() << "; " << email->subject() << "\r\n";
        delete email;

        i = i + 1;
    }

    delete messageSet;

    std::cout << "OK" << "\r\n";
    }