Dear Werner:
Unfortunately I don't have the source of the writing program. It
could be anything actually; labview, C, C++, etc... . I'm working on
a collaborative program for collecting data, and my software is
supposed to upload the data to the main storage server for backup
and data analysis. Everyone is free to use any tools they want for
data acquisition.
Is there any solution to my problem that doesn't involve me having
authority on the writing program? Currently I'm using a method that
I invented, where I measure the size of the file multiple times, and
if the size doesn't change for some time, then that decide that the
file isn't being written... that's the only way I could come up
with, but this has nothing to do with HDF5.
All the best,
Samer
On 19.07.2015 12:23, Werner Benger
wrote:
Hi Samer,
do you have full source code access to both programs, the one
writing the file and the one uploading it?
If so, would adding some file locking mechanism ( https://en.wikipedia.org/wiki/File_locking
) help your case?
Cheers,
Werner
On 19.07.2015 02:50, Samer Afach
wrote:
Dear Werner:
Thank you for your response and your time.
I tried modifying the source code of h5check, but it's very
complicated and returns strings instead of error codes. Besides,
I tried to compile it by including the three files in the main c
file and it gave errors that don't seem to be easily trackable.
It'll take me lots of time to prepare something reliable out of
it with full testing. I wonder why the hdf group didn't
implement such a functionality in low language, I thought it
exists and I can't find it. :(
About my second question, apparently I wasn't clear on what I
really need and I was misunderstood. What I need is to check
whether the file I want to read is being accessed by some other
program. My problem is that the file I wanna deal with is being
written by some other program, and I want to initiate an upload
after it's done writing. So I would like to check whether the
other program is finished writing and closed it before I send it
to my upload queue.
All the best,
Samer
On 18.07.2015 23:11, Werner Benger
wrote:
Hi Samer,
On 18.07.2015 16:23, Samer Afach
wrote:
Dear pros:
I have two similar issues I would like to ask about, and I'd
be grateful if you could help me:
1- How can I check HDF5 file integrity in C/C++ (I prefer
low level C)? I know there's a software called h5check, but
I need a function to do that, not a software. In my
application, it's not an option to execute h5check from my
system.
Is there any objection against you taking the source code of
h5check, rename the main function to h5check_main() and then
call it as C function from your code?
2- How can I do a quick check in C/C++ to see whether the
file is being written/modified/open for write? I looked in
this link which discusses metadata, but there doesn't
seem to be a clear way through the C/C++ interface for me a
to read the first two bits that give me that information.
Could you please help with that with a simple example?
This sounds as if you want to know what the HDF5 library is
currently doing with a file? Well what you could do is to
modify the virtual file driver that you want to use, and let
it keep track of that happens with the file. It's the VFD that
does the actual writing of a file content, so you can trace
its write() call to keep track what exactly happens when. It's
some effort of course.
Cheers,
Werner
All the best,
Samer
_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org
Twitter: https://twitter.com/hdf5
--
___________________________________________________________________________
Dr. Werner Benger Visualization Research
Center for Computation & Technology at Louisiana State University (CCT/LSU)
2019 Digital Media Center, Baton Rouge, Louisiana 70803
Tel.: +1 225 578 4809 Fax.: +1 225 578-5362
_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org
Twitter: https://twitter.com/hdf5
_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org
Twitter: https://twitter.com/hdf5
--
___________________________________________________________________________
Dr. Werner Benger Visualization Research
Center for Computation & Technology at Louisiana State University (CCT/LSU)
2019 Digital Media Center, Baton Rouge, Louisiana 70803
Tel.: +1 225 578 4809 Fax.: +1 225 578-5362
_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org
Twitter: https://twitter.com/hdf5
|
