----- Original Message -----
From: "Cédric Bosdonnat" <[email protected]>
To: "Zachary Mitchell" <[email protected]>
Sent: Wednesday, September 22, 2010 10:37 PM
Subject: Re: Unicode Byte terminator for PicturesTable and HWPFDocument.
Hi Zachary,
On Wed, 2010-09-22 at 21:40 +0930, Zachary Mitchell wrote:
I have learned the following -
"Word picture structures are concatenated one after the other in the data
stream if the document contains pictures. Data stream is easily reachable
via HWPFDocument._dataStream property. A picture is represented in the
document text stream as a special character, an Unicode whose
CharacterRun.isSpecial() returns true. The file location of the picture
in the Word binary file is accessed via CharacterRun.getPicOffset(). The
CharacterRun.getPicOffset() is a byte offset into the data stream.
Beginning at the position recorded in picOffset, a header data structure,
will be stored. "
If I wish to insert one or more Picture(s),
[org.apache.poi.pwpf.usermodel.Picture] picture files, from a
Java.io.File object of an available OS file,
(using
byte [] content = Picture.getRawContent();
)
-What is the unicode/byte(s) I am looking for in my HWPFDocument data
stream where I place Picture Data?
IIRC you just need to append the picture and it's description structure
to the data stream. You'll end up with a succession of PICF structures.
(p181 in the PDF specs). Have a look at PICF.cbHeader as it gives the
length of the structure (from what I remember of it).
-How do I terminate the new place in the Word HWPFDocument where Picture
data in the stream ends?
-May I perform the same process, ad infinitum, for as many Picture(s)
desired, in a HWPFDocument?
-How do I specify in the datastream what the image type is,
by sending the bytes of the java.io.File image object to the appropriate
fields in the Picture Object
created from this stream
[Picture.BMP/Picture.GIF/Picture.JPG/Picture.WMF1/Picture.WMF2]
before callying getRawContent();
From what I saw in the PicturesTable source code, there is currently
nothing to write images to an HPWFDocument, but they can be read. You
could improve that and submit a patch if you wish.
If you want to directly write to the Data stream, then don't forget that
images are refered by a 0x01 character in the text content and you need
to define some character properties like picOffset.
Regards,
--
Cédric Bosdonnat
Go-oo hacker
http://go-oo.org
OOo Eclipse Integration developer
http://cedric.bosdonnat.free.fr
What I wish to know is how, for example, a written and completed
HWPFDocument with inserted, embedded images,
how the images bytes for one image start and end, for however many images
there are
in the HWPFDocument.getDataStream();
So that I may write (insert )image(s) data to
HWPFDocument.getDataStream()
which have been taken from a java.io.File, to a
org.apache.poi.hwpf.userModel.Picture
object (appropriate byte field for Image type), and finally from
Picture.getRawContent();
How do I correctly alter the HWPFDocument._dataStream
by inserting bytes to insert Pictures,
and/ or past one Picture, as many Pictures as one may want?
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