(C++) Determine the Number of Unseen Email Messages

Demonstrates how to determine how many unseen messages exist in an email account on an IMAP server.

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#include <CkImap.h>
#include <CkMessageSet.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 to an IMAP server.
    // Use TLS
    imap.put_Ssl(true);
    imap.put_Port(993);
    bool success = imap.Connect("imap.someMailServer.com");
    if (success != true) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    // Login
    success = imap.Login("***","***");
    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;
    }

    // After selecting the mailbox. the total number of emails
    // is immediately available:
    int totalNum = imap.get_NumMessages();
    std::cout << "Num messages = " << totalNum << "\r\n";

    // To determine the number of unseen messages, a call
    // to Search is required, which returns the set of UIDs
    // of all unseen messages.

    // We can choose to fetch UIDs or sequence numbers.
    bool fetchUids = true;

    CkMessageSet *messageSet = imap.Search("UNSEEN",fetchUids);
    if (imap.get_LastMethodSuccess() == false) {
        std::cout << imap.lastErrorText() << "\r\n";
        return;
    }

    unsigned long numUnseen = messageSet->get_Count();
    std::cout << numUnseen << "\r\n";

    std::cout << "UIDs ----" << "\r\n";

    // Display the UIDs
    int i = 0;
    while (i < messageSet->get_Count()) {
        std::cout << messageSet->GetId(i) << "\r\n";
        i = i + 1;
    }

    // Disconnect from the IMAP server.
    success = imap.Disconnect();

    delete messageSet;
    }