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 <C_CkImap.h>
#include <C_CkMessageSet.h>

void ChilkatSample(void)
    {
    HCkImap imap;
    BOOL success;
    long totalNum;
    HCkMessageSet messageSet;
    BOOL fetchUids;
    long numUnseen;
    long i;
    long msgId;

    imap = CkImap_Create();

    //  Anything unlocks the component and begins a fully-functional 30-day trial.
    success = CkImap_UnlockComponent(imap,"Anything for 30-day trial");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        return;
    }

    //  Connect to an IMAP server.
    success = CkImap_Connect(imap,"mail.chilkatsoft.com");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        return;
    }

    //  Login
    success = CkImap_Login(imap,"***","***");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        return;
    }

    //  Select an IMAP mailbox
    success = CkImap_SelectMailbox(imap,"Inbox");
    if (success != TRUE) {
        printf("%s\n",CkImap_lastErrorText(imap));
        return;
    }

    //  After selecting the mailbox. the total number of emails
    //  is immediately available:

    totalNum = CkImap_getNumMessages(imap);
    printf("%d\n",totalNum);

    //  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.

    fetchUids = TRUE;

    messageSet = CkImap_Search(imap,"UNSEEN",fetchUids);
    if (messageSet == 0 ) {
        printf("%s\n",CkImap_lastErrorText(imap));
        return;
    }

    numUnseen = CkMessageSet_getCount(messageSet);
    printf("%d\n",numUnseen);

    printf("UIDs ----\n");

    //  Display the UIDs

    for (i = 0; i <= CkMessageSet_getCount(messageSet) - 1; i++) {
        msgId = CkMessageSet_GetId(messageSet,i);
        printf("%d\n",msgId);
    }

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

    CkMessageSet_Dispose(messageSet);

    CkImap_Dispose(imap);

    }