Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

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

void ChilkatSample(void)
    {
    HCkImap imap;
    BOOL success;
    HCkMessageSet messageSet;
    BOOL fetchUids;
    HCkEmailBundle bundle;
    long i;
    HCkEmail email;
    long j;
    const char * name;
    const char * addr;
    long numAttach;
    long attachSize;

    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;
    }

    //  We can choose to fetch UIDs or sequence numbers.

    fetchUids = TRUE;
    //  Get the message IDs of all the emails in the mailbox
    messageSet = CkImap_Search(imap,"ALL",fetchUids);
    if (messageSet == 0 ) {
        printf("%s\n",CkImap_lastErrorText(imap));
        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.

    bundle = CkImap_FetchHeaders(imap,messageSet);
    if (bundle == 0 ) {
        CkMessageSet_Dispose(messageSet);
        printf("%s\n",CkImap_lastErrorText(imap));
        return;
    }

    //  Loop over the email objects and display information
    //  about each:

    for (i = 0; i <= CkEmailBundle_getMessageCount(bundle) - 1; i++) {

        email = CkEmailBundle_GetEmail(bundle,i);

        //  Display the From and Subject
        printf("%s\n",CkEmail_ck_from(email));
        printf("%s\n",CkEmail_subject(email));

        //  Display the recipients:

        for (j = 0; j <= CkEmail_getNumTo(email) - 1; j++) {
            name = CkEmail_getToName(email,j);
            addr = CkEmail_getToAddr(email,j);
            printf("%s, %s\n",name,addr);
        }

        for (j = 0; j <= CkEmail_getNumCC(email) - 1; j++) {
            name = CkEmail_getCcName(email,j);
            addr = CkEmail_getCcAddr(email,j);
            printf("%s, %s\n",name,addr);
        }

        //  Show the total size of the email, including body and attachments:
        printf("%d\n",CkEmail_getSize(email));

        //  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:

        numAttach = CkImap_GetMailNumAttach(imap,email);
        for (j = 0; j <= numAttach - 1; j++) {
            printf("%s\n",CkImap_getMailAttachFilename(imap,email,j));

            attachSize = CkImap_GetMailAttachSize(imap,email,j);
            printf("    size = %d bytes\n",attachSize);
        }

        printf("--\n");
        CkEmail_Dispose(email);
    }

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

    CkMessageSet_Dispose(messageSet);
    CkEmailBundle_Dispose(bundle);

    CkImap_Dispose(imap);

    }