Count the Messages in a multipart/digest Email

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Demonstrates the read-only Chilkat Email.NumDigests property, which is the number of message/rfc822 parts contained within a multipart/digest enclosure. If no such enclosure exists, the value is 0. Digest indexes are zero-based; use GetDigestEmail to retrieve an individual bundled message as its own Email object. This example loads a digest email and lists each message's subject.

Background: A multipart/digest is a way to package many separate emails inside one carrier message — historically used by mailing lists to send a single daily "digest" containing all of that day's posts. Each bundled item is a complete message/rfc822 email with its own headers and body. This differs from NumAttachedMessages, which counts nested messages attached to an ordinary email rather than the members of a digest enclosure.

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#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkEmail email;
    int n;
    HCkEmail digestEmail;
    int i;

    success = FALSE;

    //  Demonstrates the read-only Email.NumDigests property, which is the number of
    //  message/rfc822 parts contained within a multipart/digest enclosure.  If there is no
    //  multipart/digest enclosure, the value is 0.  Digest indexes are zero-based.

    email = CkEmail_Create();

    //  Load a multipart/digest email (a single email that bundles many messages).
    success = CkEmail_LoadEml(email,"qa_data/eml/digest.eml");
    if (success == FALSE) {
        printf("%s\n",CkEmail_lastErrorText(email));
        CkEmail_Dispose(email);
        return;
    }

    n = CkEmail_getNumDigests(email);
    printf("NumDigests = %d\n",n);

    //  Retrieve each bundled message as its own Email object.
    digestEmail = CkEmail_Create();

    for (i = 0; i <= n - 1; i++) {
        success = CkEmail_GetDigestEmail(email,i,digestEmail);
        printf("Digest %d subject: %s\n",i,CkEmail_subject(digestEmail));
    }

    //  Note: Paths such as "qa_data/..." are relative local filesystem paths,
    //  relative to the current working directory of the running application.


    CkEmail_Dispose(email);
    CkEmail_Dispose(digestEmail);

    }