(Unicode 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 <C_CkEmailW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    HCkEmailW email;
    BOOL success;
    HCkStringBuilderW sbContentType;
    BOOL caseSensitive;
    BOOL inlineOnly;
    BOOL excludeAttachments;
    const wchar_t *searchSpec;
    int numParts;
    int i;
    const wchar_t *textBody;
    HCkEmailW attachedEmail;
    HCkBinDataW bdMime;
    HCkBinDataW bd;

    // 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

    email = CkEmailW_Create();

    success = CkEmailW_LoadEml(email,L"qa_data/eml/sample.eml");
    if (success == FALSE) {
        wprintf(L"Failed to load .eml\n");
        CkEmailW_Dispose(email);
        return;
    }

    sbContentType = CkStringBuilderW_Create();
    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)
    inlineOnly = FALSE;
    excludeAttachments = FALSE;
    searchSpec = L"*/*";

    numParts = CkEmailW_GetNumPartsOfType(email,searchSpec,inlineOnly,excludeAttachments);
    i = 0;
    while (i < numParts) {
        // What is the Content-Type of this MIME part?
        CkStringBuilderW_Append(sbContentType,CkEmailW_getNthContentType(email,i,searchSpec,inlineOnly,excludeAttachments));
        if (CkStringBuilderW_StartsWith(sbContentType,L"text/",caseSensitive) == TRUE) {
            // Get the text body of this MIME part.
            textBody = CkEmailW_getNthTextPartOfType(email,i,searchSpec,inlineOnly,excludeAttachments);
            wprintf(L"Got text body for %s\n",CkStringBuilderW_getAsString(sbContentType));
        }
        else {
            if (CkStringBuilderW_ContentsEqual(sbContentType,L"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...
                attachedEmail = CkEmailW_Create();
                bdMime = CkBinDataW_Create();
                CkEmailW_GetNthBinaryPartOfTypeBd(email,i,searchSpec,inlineOnly,excludeAttachments,bdMime);
                CkEmailW_SetFromMimeBd(attachedEmail,bdMime);
                // Now your app can recursively process the attachedEmail...
            }
            else {
                // Get the bytes of this MIME body part.
                bd = CkBinDataW_Create();
                CkEmailW_GetNthBinaryPartOfTypeBd(email,i,searchSpec,inlineOnly,excludeAttachments,bd);
                wprintf(L"Got binary body for %s numBytes = %d\n",CkStringBuilderW_getAsString(sbContentType),CkBinDataW_getNumBytes(bd));
            }

        }

        CkStringBuilderW_Clear(sbContentType);
        i = i + 1;
    }



    CkEmailW_Dispose(email);
    CkStringBuilderW_Dispose(sbContentType);
    CkEmailW_Dispose(attachedEmail);
    CkBinDataW_Dispose(bdMime);
    CkBinDataW_Dispose(bd);

    }