Convert 8-bit MIME Parts to Base64

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Demonstrates the Chilkat Mime.Convert8Bit method, which recursively converts every part whose Content-Transfer-Encoding is 8bit or binary to base64. It takes no arguments and is a void method.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: The original SMTP standard only guaranteed 7-bit transport, and some legacy servers still reject or mangle raw 8-bit and binary content. Converting those parts to base64 — a 7-bit-safe encoding — makes the whole message safe to relay through such systems without loss. It walks the entire tree, so a multipart message with several offending parts is fixed in one call.

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#include <C_CkMime.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkMime mime;
    const char *mimeText;

    success = FALSE;

    mime = CkMime_Create();
    success = CkMime_LoadMimeFile(mime,"qa_data/message.eml");
    if (success == FALSE) {
        printf("%s\n",CkMime_lastErrorText(mime));
        CkMime_Dispose(mime);
        return;
    }

    //  Recursively convert every part whose Content-Transfer-Encoding is 8bit or binary to base64.
    //  This makes the MIME safe to transmit over channels that only support 7-bit text (such as some
    //  legacy SMTP servers).
    CkMime_Convert8Bit(mime);

    printf("8bit/binary parts converted to base64.\n");
    mimeText = CkMime_getMime(mime);
    if (CkMime_getLastMethodSuccess(mime) == FALSE) {
        printf("%s\n",CkMime_lastErrorText(mime));
        CkMime_Dispose(mime);
        return;
    }

    printf("%s\n",mimeText);


    CkMime_Dispose(mime);

    }