Sean DiZazzo wrote:
On Jul 9, 5:34 pm, keith <[EMAIL PROTECTED]> wrote:
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Ethan Furman wrote:
writeson wrote:
Guys,
Thanks for your replies, they are helpful. I should have included in
my initial question that I don't have as much control over the program
that writes (pgm-W) as I'd like. Otherwise, the write to a different
filename and then rename solution would work great. There's no way to
tell from the os.stat() methods to tell when the file is finished
being copied? I ran some test programs, one of which continously
copies big files from one directory to another, and another that
continously does a glob.glob("*.pdf") on those files and looks at the
st_atime and st_mtime parts of the return value of os.stat(filename).
From that experiment it looks like st_atime and st_mtime equal each
other until the file has finished being copied. Nothing in the
documentation about st_atime or st_mtime leads me to think this is
true, it's just my observations about the two test programs I've
described.
Any thoughts? Thanks!
Doug
The solution my team has used is to monitor the file size. If the file
has stopped growing for x amount of time (we use 45 seconds) the file is
done copying. Not elegant, but it works.
--
Ethan
Also I think that matching the md5sums may work. Just set up so that it
checks the copy's md5sum every couple of seconds (or whatever time
interval you want) and matches against the original's. When they match
copying's done. I haven't actually tried this but think it may work.
Any more experienced programmers out there let me know if this is
unworkable please.
K
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I use a combination of both the os.stat() on filesize, and md5.
Checking md5s works, but it can take a long time on big files. To fix
that, I wrote a simple sparse md5 sum generator. It takes a small
number bytes from various areas of the file, and creates an md5 by
combining all the sections. This is, in fact, the only solution I have
come up with for watching a folder for windows copys.
The filesize solution doesn't work when a user copies into the watch
folder using drag and drop on Windows because it allocates all the
attributes of the file before any data is written. The filesize will
always show the full size of the file.
~Sean
Good info, Sean, thanks. One more option may be to attempt to rename
the file -- if it's still open for copying, that will fail; success
indicates the copy is done. Of course, as Larry Bates pointed out, this
could fail if the copy is followed by a re-open and appending.
Hopefully that's not an issue for the OP.
--
Ethan
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