Extracts/decodes a message section from the supplied filename.
The contents of the section will be decoded according to their transfer encoding - base64, quoted-printable and uuencoded text are supported.
MIME resource, created with
Can be a file name or a valid stream resource.
If set, this must be either a valid callback that will be passed the
extracted section, or
NULL to make this function return the
If not specified, the contents will be sent to "stdout".
If callbackfunc is not
If callbackfunc is set to
NULL, returns the
extracted section as a string.
FALSE on error.