Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

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// Needs #include <CkImap.h>
// Needs #include <CkMessageSet.h>
// Needs #include <CkEmailBundle.h>
// Needs #include <CkEmail.h>

    CkString strOut;

    CkImap imap;

    bool success;

    //  Anything unlocks the component and begins a fully-functional 30-day trial.
    success = imap.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Connect to an IMAP server.
    success = imap.Connect("mail.chilkatsoft.com");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Login
    success = imap.Login("****","****");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkMessageSet *messageSet = 0;
    //  We can choose to fetch UIDs or sequence numbers.
    bool fetchUids;
    fetchUids = true;
    //  Get the message IDs of all the emails in the mailbox
    messageSet = imap.Search("ALL",fetchUids);
    if (messageSet == 0 ) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  When downloading headers, each email object contains
    //  (obviously) the headers, but the body will be missing.
    //  Also, attachments will not be included.  However, it is
    //  possible to get information about the attachments
    //  as well as the complete size of the email.
    CkEmailBundle *bundle = 0;
    bundle = imap.FetchHeaders(*messageSet);
    if (bundle == 0 ) {
        delete messageSet;
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Loop over the email objects and display information
    //  about each:
    long i;
    for (i = 0; i <= bundle->get_MessageCount() - 1; i++) {
        CkEmail *email = 0;
        email = bundle->GetEmail(i);

        //  Display the From and Subject
        strOut.append(email->ck_from());
        strOut.append("\r\n");
        strOut.append(email->subject());
        strOut.append("\r\n");

        //  Display the recipients:
        long j;
        const char * name;
        const char * addr;
        for (j = 0; j <= email->get_NumTo() - 1; j++) {
            name = email->getToName(j);
            addr = email->getToAddr(j);
            strOut.append(name);
            strOut.append(", ");
            strOut.append(addr);
            strOut.append("\r\n");
        }

        for (j = 0; j <= email->get_NumCC() - 1; j++) {
            name = email->getCcName(j);
            addr = email->getCcAddr(j);
            strOut.append(name);
            strOut.append(", ");
            strOut.append(addr);
            strOut.append("\r\n");
        }

        //  Show the total size of the email, including body and attachments:
        strOut.appendInt(email->get_Size());
        strOut.append("\r\n");

        //  When a full email is downloaded, we would use the
        //  email.NumAttachments property in conjunction with the
        //  email.GetMailAttach* methods.
        //  However, when an email object contains only the header,
        //  we need to access the attachment info differently:
        long numAttach;
        numAttach = imap.GetMailNumAttach(*email);
        for (j = 0; j <= numAttach - 1; j++) {
            strOut.append(imap.getMailAttachFilename(*email,j));
            strOut.append("\r\n");
            long attachSize;
            attachSize = imap.GetMailAttachSize(*email,j);
            strOut.append("    size = ");
            strOut.appendInt(attachSize);
            strOut.append(" bytes");
            strOut.append("\r\n");
        }

        strOut.append("--");
        strOut.append("\r\n");
        delete email;
    }

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

    delete messageSet;
    delete bundle;

    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());