QMimeSource: How to determine "Content-Transfer-Encoding" SMTP

[Till Oliver Knoll]

Hi,

I want to extend the Smtp Qt example with attachements of generic MIME 
type (images, text...).

I found the class QMimeSource quite useful, it provides me with the MIME 
type and encodes the data for me (at least I think so) with 
QMimeSource::encodeData(). It looks a bit like this so far:

    QString attachment;  // path to file to attach
    ...

    QMimeSourceFactory *mimeSourceFactory =
        QMimeSourceFactory::defaultFactory();

    QMimeSource *mimeSource;

    // setup the MIME source
    mimeSourceFactory->setFilePath (attachment);
    mimeSource = mimeSourceFactory->data (attachment);

    QString multiPart =  <text MIME part> +
        // attachment
        QString::fromLatin1 ("\n\n--%1").arg (mimeBoundary) +
        QString::fromLatin1 ("\nContent-Type: %1").arg
            (mimeSource->format()) +
        // (1) how to determine the Encoding here? Must be e.g. 8bit
        // for XML, BASE64 for binary data...
        QString::fromLatin1 ("\nContent-Transfer-Encoding: BASE64") +
        QString::fromLatin1 ("\nContent-Disposition: attachment; 
filename=%1\n\n").arg (fileInfo.fileName()) +
        // (2) does encodedData() e.g. for images really produce BASE64
        //     encoding?
        QString (mimeSource->encodedData (mimeSource->format()));
    ...
    <construct the SMTP message which contains the 'multiPart'>


Unclear to me are (1): is there a way to find out whether the MIME 
source contains binary data or text data? And (2): the code as it is 
fails e.g. for a JPEG image, I don't get the expected BASE64 encoding 
(viewable in the qDebug output). Does encodeData() really produce BASE64 
encoding for JPEG images (and other binary data)? Or did i misunderstand 
the concept of QMimeSource here?

Thanks, Oliver

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