Could you share a code snippet? If you cat the file to hd does it read correctly even with the zero filesize?
On Wed, Aug 29, 2012 at 1:19 AM, Tom Kuiper <kui...@jpl.nasa.gov> wrote: > ** > On 08/28/2012 04:11 PM, Adam Barta wrote: > > is it possible that ipython is not actually closing the file but keeping > the file descriptor open behind your back, if so then seeking to 0 might > solve it? > > Clever idea! but, alas, Python is cleverer than that. I put a seek(0) > after (re)opening the file and before reading. Still get 0 bytes back. > > I'm not having much luck in finding a way to change the file size. There > is a 'truncate' method that will do it but Linux will zero fill an extended > file. > > Cheers > > Tom > > > > > On Wed, Aug 29, 2012 at 1:00 AM, Tom Kuiper <kui...@jpl.nasa.gov> wrote: > >> On 08/28/2012 03:54 PM, David MacMahon wrote: >> >>> On Aug 28, 2012, at 3:39 PM, Tom Kuiper wrote: >>> >>> >>>> I don't know how to get Python to read more than teh nominal file size >>>> if it is supposed to look like a file. >>>> >>>> >>> If you want to read the register value a second time, you need to seek >>> to the beginning of the file first, then read four bytes. You should be >>> able to repeat the seek/read pattern as many times as you want. >>> >>> >> I close the file after I write to it and open it again for the read. >> After I write to the file, "ls -l" gives a size of zero instead of 4. >> >> If that's not what's confusing you, can you please clarify what is? >>> >> I am not trying to mix reads and writes on an open file. I know about >> seek and tell if that were what I wanted to do. >> >> Tom >> >> > > > -- > *Adam Barta* > c: +27 72 105 8611 > e: a...@ska.ac.za > w: www.ska.ac.za > > > > > -- > I or me? http://www.oxforddictionaries.com/page/145 > > -- *Adam Barta* c: +27 72 105 8611 e: a...@ska.ac.za w: www.ska.ac.za
