(Unicode C++) Load .eml and Examine the Structure, Attachments, and Related Items

Demonstrates how to load examine the MIME structure of a .eml, and also examine the attachment and related item filenames, attached messages, and multipart/report and DSN information.

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#include <CkMimeW.h>
#include <CkEmailW.h>
#include <CkStringArrayW.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const wchar_t *emlPath = L"C:/AAWorkarea/beatrix/roesner.eml";

    CkMimeW mime;

    bool success = mime.LoadMimeFile(emlPath);
    if (success != true) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    wprintf(L"---- MIME structure ----\n");
    wprintf(L"%s\n",mime.getStructure(L"text"));
    wprintf(L"------------------------\n");

    CkEmailW email;
    success = email.LoadEml(emlPath);

    // Was this a signed and/or encrypted email?
    // If so, then loading the .eml automatically unwraps
    // (i.e. verifies signatures and decrypts) and the resultant
    // email is what existed prior to signing/encrypting.
    wprintf(L"Email was Signed: %d\n",email.get_ReceivedSigned());
    wprintf(L"Email was Encrypted: %d\n",email.get_ReceivedEncrypted());
    if (email.get_ReceivedSigned() == true) {
        wprintf(L"Signature(s) valid = %d\n",email.get_SignaturesValid());
    }

    if (email.get_ReceivedEncrypted() == true) {
        wprintf(L"Decrypted successfully = %d\n",email.get_Decrypted());
    }

    int i = 0;
    int numAttach = email.get_NumAttachments();
    wprintf(L"Number of attachments = %d\n",numAttach);

    while (i < numAttach) {
        wprintf(L"---- Attachment %d\n",i);

        // Examine the filename (if any)
        wprintf(L"filename: %s\n",email.getAttachmentFilename(i));
        // Examine the content-ID (if any)
        wprintf(L"Content-ID: %s\n",email.getAttachmentContentID(i));
        // Examine the content-type
        wprintf(L"Content-Type: %s\n",email.getAttachmentContentType(i));
        // Examine the content-disposition
        wprintf(L"Content-Disposition%s\n",email.getAttachmentHeader(i,L"content-disposition"));
        // Examine the attachment size:
        wprintf(L"Size (in bytes) of the attachment: %d\n",email.GetAttachmentSize(i));

        i = i + 1;
    }

    wprintf(L"--\n");

    // Now for the related items.

    // Note: A MIME sub-part can potentially be both a related item AND an attachment.
    // The typical case is when the item is contained under the multipart/related enclosure and 
    // the item also has a "Content-Disposition" header indicating "attachment".
    // The location within multipart/related makes it a "related item", yet the Content-Disposition can also make it semantically an attachment.
    // Related items and attachments are not necessarily mutually exclusive.

    int numRelated = email.get_NumRelatedItems();
    wprintf(L"Number of related items = %d\n",numRelated);
    i = 0;
    while (i < numRelated) {
        wprintf(L"---- Related Item %d\n",i);

        // Examine the filename (if any)
        wprintf(L"filename: %s\n",email.getRelatedFilename(i));
        // Examine the content-ID (if any)
        wprintf(L"Content-ID: %s\n",email.getRelatedContentID(i));
        // Examine the content-type
        wprintf(L"Content-Type: %s\n",email.getRelatedContentType(i));
        // Examine the content-location (if any)
        wprintf(L"Content-Location%s\n",email.getRelatedContentLocation(i));

        i = i + 1;
    }

    // The email could also have attached messages.
    // An attached message is another email that was attached to this email.
    int numAttachedMessages = email.get_NumAttachedMessages();
    wprintf(L"Number of attached messages = %d\n",numAttachedMessages);
    i = 0;
    while (i < numAttachedMessages) {
        wprintf(L"---- Attached message %d\n",i);

        // Examine the attached email
        CkEmailW *em = email.GetAttachedMessage(i);
        wprintf(L"from: %s\n",em->ck_from());
        wprintf(L"subject: %s\n",em->subject());
        delete em;
        i = i + 1;
    }

    // An email could also be a multipart/report email. 
    // This is a DSN (Delivery Status Notification)
    // The NumReports property indicates how many "reports" exist.
    int numReports = email.get_NumReports();
    i = 0;
    wprintf(L"Number of reports = %d\n",numReports);
    i = 0;
    while (i < numReports) {
        wprintf(L"---- Report %d\n",i);
        // Get the raw report data...
        wprintf(L"%s\n",email.getReport(i));
        i = i + 1;
    }

    // If the email is a multipart/report, then the information
    // from the message/delivery-status part of the email can be retrieved:
    if (email.IsMultipartReport() == true) {

        wprintf(L"--- Delivery Status Information:\n");
        wprintf(L"Status: %s\n",email.getDeliveryStatusInfo(L"Status"));
        wprintf(L"Action: %s\n",email.getDeliveryStatusInfo(L"Action"));
        wprintf(L"Reporting-MTA: %s\n",email.getDeliveryStatusInfo(L"Reporting-MTA"));

        CkStringArrayW *sa = email.GetDsnFinalRecipients();
        int numFinalRecipients = sa->get_Count();
        i = 0;
        while (i < numFinalRecipients) {
            wprintf(L"final recipient: %s\n",sa->getString(i));
            i = i + 1;
        }

        delete sa;
    }
    }