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bbottema / outlook-message-parser

A Java parser for Outlook messages (.msg files)
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Can I obtain a nested Outlook message attachment as .msg file? #72

Closed shilibi closed 7 months ago

shilibi commented 7 months ago

Hi, I use outlook-message-parser, I can get inputstream of OutlookFileAttachment， but I can not get inputstream of OutlookMsgAttachment, how to get ?

bbottema commented 7 months ago

Neither classes exposes data as an input stream. How did you get an inputstream from OutlookFileAttachment as you said?

shilibi commented 7 months ago

I got the inputStream by this:

OutlookFileAttachment outlookFileAttachment = (OutlookFileAttachment)outlookAttachment; byte[] data = outlookFileAttachment.getData(); InputStream stream = new ByteArrayInputStream(data);

But I cannot got the inputStream by this:

if (outlookAttachment instanceof OutlookMsgAttachment) { msg = ((OutlookMsgAttachment) outlookAttachment).getOutlookMessage(); }

Does the inputStream can get by this way ? if (outlookAttachment instanceof OutlookMsgAttachment) { msg = ((OutlookMsgAttachment) outlookAttachment).getOutlookMessage(); msg.getPropertyValue(SOME_CODE？); } This problem has been bothering me for a long time = =、

shilibi commented 7 months ago

Maybe I didn’t describe it clearly 😃, I wanna download the msg attachment in a msg file. I only can get the outlookMessage object for outlookMsgAttachment

bbottema commented 7 months ago

I see! Well, I'm sorry to disappoint you, but that's not possible with this library. Under the hood, Apache POI is being used to decode the Outlook message structure, and when it encounters another Outlook message attachment, it is not available as data; it too is a parsed structure that we get back from Apache POI. There's nothing I can do about that, unfortunately.

shilibi commented 7 months ago

Thank you very much for your reply. Does this mean that as long as you use the dependency of Apache POI, you cannot get inline attachments ？ Do you know of other dependencies that can be used to obtain a nested Outlook message attachment ？

bbottema commented 7 months ago

Not quite, the CID's are preserved, so inline (embedded) attachments are available. Just not Outlook messages in particular, as they are parsed internally right away by Apache POI.

As far as I know, there is nothing else in Java that is able to parse .msg files. Apache POI and the very few that are based on it - outlook-message-parser being the only real open source option I'm aware of - are the only ones capable of that.