(C++) Iterate MIME Parts of an Email

Demonstrates how to iterate over the MIME sub-parts of an email, and retrieve the content of each MIME sub-part body.

Note: This example requires some new features added to Chilkat v9.5.0.95.

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#include <CkEmail.h>
#include <CkStringBuilder.h>
#include <CkBinData.h>

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

    // See the following Chilkat post to Quickly Understand Email MIME

    CkEmail email;

    bool success = email.LoadEml("qa_data/eml/sample.eml");
    if (success == false) {
        std::cout << "Failed to load .eml" << "\r\n";
        return;
    }

    CkStringBuilder sbContentType;
    bool caseSensitive = false;

    // Get the total number of non-multipart MIME sub-parts.
    // (This is a simple way of iterating over all the MIME leaf parts regardless of the MIME tree structure)
    bool inlineOnly = false;
    bool excludeAttachments = false;
    const char *searchSpec = "*/*";

    int numParts = email.GetNumPartsOfType(searchSpec,inlineOnly,excludeAttachments);
    int i = 0;
    while (i < numParts) {
        // What is the Content-Type of this MIME part?
        sbContentType.Append(email.getNthContentType(i,searchSpec,inlineOnly,excludeAttachments));
        if (sbContentType.StartsWith("text/",caseSensitive) == true) {
            // Get the text body of this MIME part.
            const char *textBody = email.getNthTextPartOfType(i,searchSpec,inlineOnly,excludeAttachments);
            std::cout << "Got text body for " << sbContentType.getAsString() << "\r\n";
        }
        else {
            if (sbContentType.ContentsEqual("message/rfc822",caseSensitive) == true) {
                // If the Content-Type is message/rfc822, then the MIME body for this part contains a full embedded MIME messages.
                // Your application could load it into a Chilkat email object and recursively process...
                CkEmail attachedEmail;
                CkBinData bdMime;
                email.GetNthBinaryPartOfTypeBd(i,searchSpec,inlineOnly,excludeAttachments,bdMime);
                attachedEmail.SetFromMimeBd(bdMime);
                // Now your app can recursively process the attachedEmail...
            }
            else {
                // Get the bytes of this MIME body part.
                CkBinData bd;
                email.GetNthBinaryPartOfTypeBd(i,searchSpec,inlineOnly,excludeAttachments,bd);
                std::cout << "Got binary body for " << sbContentType.getAsString() << " numBytes = " << bd.get_NumBytes() << "\r\n";
            }

        }

        sbContentType.Clear();
        i = i + 1;
    }
    }