--On 11. Dezember 2007 18:33:14 +0100 Josef Meile <[EMAIL PROTECTED]>
wrote:
I've been looking around for this, but can't seem to find anything. I'm
assuming that it is just not possible, but thought I'd ask just in case.
For File objects, I see that manage_edit() has the parameters: title,
content_type, precondition, filedata & REQUEST. Setting something in
the filedata parameter will replace the file's current data with that.
This implies (to me at least) that the only way one can edit a file is a
complete rewrite. Does there exist a way to simply append data to the
end
of the file? For instance, if one wanted to write to a file line by
line,
is that possible in Zope?
out-of-the-box: NO
Appending data would require the manipulation of the linked list of Pdata
elements. There is no API for this available...so basically forget it.
What about the python pickle/cpickle and marshal modules? If I'm not
wrong zope uses cpickle to append data to the Data.fs, or am I wrong?
I haven't read the module documetation deeply, but as I understand,
pickle/cpickle is used for serializing python objects, while marshal is
for binary data.
http://docs.python.org/lib/module-pickle.html
http://docs.python.org/lib/module-marshal.html
Anyway, you still need to load the whole file into a temporal memory.
Completely unrelated at this point. You can only update a file as a whole
with the existing functionality. You are of course free to write your own
file implementation.
-aj
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