Re: [Discuss-gnuradio] filename using time-stamp in GRC

[ematlis]

--- On Thu, 1/20/11, Alexandru Csete <address@hidden> wrote:

> From: Alexandru Csete <address@hidden>
> Subject: Re: [Discuss-gnuradio] filename using time-stamp in GRC
> To: address@hidden
> Date: Thursday, January 20, 2011, 11:41 AM
> On Thu, Jan 20, 2011 at 5:41
> PM,  <address@hidden>
> wrote:
> >
> ...
> > Following up on this, I found this site that had some
> useful suggestions:http://www.oz9aec.net/index.php/gnu-radio/grc-examples
> >
> > A grc example is provided that implements a dynamic
> time stamp, but NOT a button to control it.  So I am trying
> to use a Variable Chooser to select between "/dev/null" and
> the filename that is based on the time-stamp.  However,
> nothing is generated.  In particular, I have:
> >
> > A file sink with File: recfile
> > A Variable with ID prefix with Value "./"
> > A Variable Chooser with ID: recfile, Default Value:
> "/dev/null" and
> > Choices of "/dev/null" or "prefix +
> datetime.now().strftime("%Y.%m.%d.%H.%M.%S") + ".bin"
> >
> > I was hoping this would dynamically create a file with
> the current time stamp for the name, but no files are
> actually being generated.  Could this be and issue related
> to a bug that is described in the link below?
> >
> > http://lists.gnu.org/archive/html/discuss-gnuradio/2011-01/msg00080.html
> >
> > If so, will this approach work if I upgrade via git?
> >
> 
> Hi Eric,
> 
> The problem with this simple example is that the variable
> containing
> 
> "prefix + datetime.now().strftime("%Y.%m.%d.%H.%M.%S") +
> ".bin"
> 
> is evaluated when you start the script, so it will only
> work for a
> single file per execution. I believe it is for the same
> reason that
> you see no file with your modification: The file sink is
> initialized
> with /dev/null as filename and it can not change the file
> name during
> runtime because the required code for "close file, set new
> file name,
> open new file" is not generated by GRC - I am not exactly
> sure about
> this but it should be obvious if you look in the generated
> code. I
> would try to do as Josh said in the other mail, implement
> the required
> code yourself and embed it as a custom block.
> 
> Alex
> 
Thank you all.

Eric

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