Unicode C++

Convert 8-bit MIME Parts to Base64

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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Unicode C++

#include <CkMimeW.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkMimeW mime;
    success = mime.LoadMimeFile(L"qa_data/message.eml");
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        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).
    mime.Convert8Bit();

    wprintf(L"8bit/binary parts converted to base64.\n");
    const wchar_t *mimeText = mime.getMime();
    if (mime.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    wprintf(L"%s\n",mimeText);
    }