[REBOL] Re: need advice on parsing image data
From: brett:codeconscious at: 28-Apr-2001 15:02
Hi Ryan,
I got the post-data file from the url of your earlier message.
I'm no expert but here's my thinking.
1) The data returned from the post should initially be treated as binary -
because you have image data that is binary and has not been encoded. So what
I did was use read/binary to get your post-data file. I don't know for sure,
but it is possible some clients may upload the file data in a different
encoding like Base 64 rather than straight binary. So you may need to handle
the case where a content-transfer-encoding header is given.
2) Though you data is binary doesn't mean you can't parse it like a string.
Just remember to use /all refinement of parse.
I already had some mime type handling stuff for emails. So I changed around
a little bit to handle your file as well. It is very possible I still
haven't handled the RFCs properly but it seems to work at the moment.
Using Rebo/View Try this script - The view part is just to show that I
succesfully got your image data.
do http://www.codeconscious.com/rebol-library/message-tools.r
post-data: read/binary http://www.fargonews.com/post-data
r: decode-mime-parts mime-parts? post-data
---------------------------7d1a92c9014c
write/binary %tf.jpg r/7/content
view layout [image %tf.jpg]
BTW I'd like to know how to display the image without having to write the
file first - anyone - please?
Hope it helps you.
Brett Handley
----- Original Message -----
From: <[ryan--christiansen--intellisol--com]>
To: <[rebol-list--rebol--com]>
Sent: Saturday, April 28, 2001 6:28 AM
Subject: [REBOL] need advice on parsing image data
When I post a form entry and a file using multipart/form-data encoding, I
get the following....
-----------------------------7d1a92c9014c
Content-Disposition: form-data; name="content"
content
-----------------------------7d1a92c9014c
Content-Disposition: form-data; name="file"; filename="D:
\fgonews\ad_graphic_01.jpg"
Content-Type: image/pjpeg
ÿØÿà (plus a whole bunch more characters that I am unable to
copy-and-paste)
-----------------------------7d1a92c9014c--
This is an easy parse. However, REBOL will not parse the image data. It
gets stuck when it reaches an unknown character, which shows up in Notepad
as a square. As you can see, I'm not even able to copy-and-paste the actual
image data from the text file into this e-mail. Does anyone have any advice
on how to parse this image data?
Ryan C. Christiansen
Web Developer
Intellisol International
4733 Amber Valley Parkway
Fargo, ND 58104
701-235-3390 ext. 6671
FAX: 701-235-9940
http://www.intellisol.com
Global Leader in People Performance Software
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