how to detect empty attachments?

[Oleg Sukhodolsky-4]

Hi,

from time to time I receive mails with empty attachments, i.e. the
message contains a part which marked as attachment but has
zero length.  I would like to filter out such attachments
without reading and it looks like the condition
"part.getInputStream().available() == 0" can be used for this purpose,
but it is not documented, that this method must return non-zero for non-empty
streams, so I decided to check here if I can use check or I must read
the stream to find out that the stream is empty.

Thanks in advance, Oleg.

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[Bill Shannon]

Oleg Sukhodolsky wrote:

> Hi,
>
> from time to time I receive mails with empty attachments, i.e. the
> message contains a part which marked as attachment but has
> zero length.  I would like to filter out such attachments
> without reading and it looks like the condition
> "part.getInputStream().available() == 0" can be used for this purpose,
> but it is not documented, that this method must return non-zero for non-empty
> streams, so I decided to check here if I can use check or I must read
> the stream to find out that the stream is empty.

You need to read the stream.

You might want to try Part.getSize first.  If it returns a non-negative
number, it should be correct.

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[Oleg Sukhodolsky-4]

On Thu, Dec 4, 2008 at 9:51 PM, Bill Shannon <bill.shannon@...> wrote:

> Oleg Sukhodolsky wrote:
>>
>> Hi,
>>
>> from time to time I receive mails with empty attachments, i.e. the
>> message contains a part which marked as attachment but has
>> zero length.  I would like to filter out such attachments
>> without reading and it looks like the condition
>> "part.getInputStream().available() == 0" can be used for this purpose,
>> but it is not documented, that this method must return non-zero for
>> non-empty
>> streams, so I decided to check here if I can use check or I must read
>> the stream to find out that the stream is empty.
>
> You need to read the stream.
>
> You might want to try Part.getSize first.  If it returns a non-negative
> number, it should be correct.
>

Thanks for suggestion.I will try it.

Oleg.

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