(Unicode C) Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here.

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#include <C_CkImapW.h>
#include <C_CkMessageSetW.h>
#include <C_CkEmailW.h>
#include <C_CkEmailBundleW.h>

void ChilkatSample(void)
    {
    HCkImapW imap;
    BOOL success;
    HCkMessageSetW messageSet;
    BOOL fetchUids;
    int numFound;
    int upperBound;
    int i;
    BOOL bUid;
    HCkEmailW email;
    HCkMessageSetW firstTen;
    HCkEmailBundleW bundle;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    imap = CkImapW_Create();

    // Connect to an IMAP server.
    // Use TLS
    CkImapW_putSsl(imap,TRUE);
    CkImapW_putPort(imap,993);
    success = CkImapW_Connect(imap,L"imap.someMailServer.com");
    if (success != TRUE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // Login
    success = CkImapW_Login(imap,L"****",L"****");
    if (success != TRUE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // Select an IMAP mailbox
    success = CkImapW_SelectMailbox(imap,L"Inbox");
    if (success != TRUE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    // We can choose to fetch UIDs or sequence numbers.
    fetchUids = TRUE;
    // Get the message IDs of all the emails in the mailbox
    messageSet = CkImapW_Search(imap,L"ALL",fetchUids);
    if (CkImapW_getLastMethodSuccess(imap) == FALSE) {
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        return;
    }

    numFound = CkMessageSetW_getCount(messageSet);
    if (numFound == 0) {
        wprintf(L"No messages found.\n");
        CkMessageSetW_Dispose(messageSet);
        CkImapW_Dispose(imap);
        return;
    }

    // Get the 1st 10 messages in messageSet.
    upperBound = 10;
    if (numFound < upperBound) {
        upperBound = numFound;
    }

    i = 0;
    bUid = CkMessageSetW_getHasUids(messageSet);
    while (i < upperBound) {

        email = CkImapW_FetchSingleHeader(imap,CkMessageSetW_GetId(messageSet,i),bUid);
        if (CkImapW_getLastMethodSuccess(imap) == FALSE) {
            wprintf(L"%s\n",CkImapW_lastErrorText(imap));
            CkMessageSetW_Dispose(messageSet);
            CkImapW_Dispose(imap);
            return;

        }
        else {
            // Do whatever is needed with the email.. 
            // ....

            CkEmailW_Dispose(email);
        }

        i = i + 1;
    }

    // Alternatively, create a new message set containing the 1st 10 message id's (UID's) 
    // from the search results message set:
    firstTen = CkMessageSetW_Create();

    for (i = 0; i <= upperBound - 1; i++) {
        CkMessageSetW_InsertId(firstTen,CkMessageSetW_GetId(messageSet,i));
    }

    CkMessageSetW_Dispose(messageSet);

    // Download the 1st ten headers:

    bundle = CkImapW_FetchHeaders(imap,firstTen);
    if (CkImapW_getLastMethodSuccess(imap) == FALSE) {
        CkMessageSetW_Dispose(firstTen);
        wprintf(L"%s\n",CkImapW_lastErrorText(imap));
        CkImapW_Dispose(imap);
        CkMessageSetW_Dispose(firstTen);
        return;
    }

    // Other examples show how to iterate over the emails contained within the bundle...

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

    CkMessageSetW_Dispose(firstTen);
    CkEmailBundleW_Dispose(bundle);


    CkImapW_Dispose(imap);
    CkMessageSetW_Dispose(firstTen);

    }