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


From: ematlis
Subject: Re: [Discuss-gnuradio] filename using time-stamp in GRC
Date: Thu, 20 Jan 2011 08:41:07 -0800 (PST)


--- On Wed, 1/19/11, address@hidden <address@hidden> wrote:

> From: address@hidden <address@hidden>
> Subject: [Discuss-gnuradio] filename using time-stamp in GRC
> To: address@hidden
> Date: Wednesday, January 19, 2011, 12:47 PM
> He all-
> 
> is there a way to implement a button controlling a
> record-to-file function where the filename is generated
> instantly from the current time stamp?  I can do this
> manually in python as follows (taken from a previously
> existing gnuradio code):
> 
>         #
>         # Recording file, in case we
> ever need to record baseband data
>         #
>         self.recording =
> gr.file_sink(gr.sizeof_float, "/dev/null")
>         self.recording_state = False
>         # Filename prefix for recording
> file
>         self.prefix = options.prefix
> 
>         # We come up with recording
> turned off, but the user may
>         #  request recording later
> on
>         self.recording.close()
> 
> .
> .
> .
> 
>     self.connect (self.source,
> self.recording)
> 
> .
> .
> .
> 
>         # Data recording control
>         buttonbox =
> wx.BoxSizer(wx.HORIZONTAL)
>         self.record_control =
> form.button_with_callback(self.panel,
>              
> label="Recording Data: Off         
>                
>                
>                
>          ",
>              
> callback=self.toggle_recording)
> 
>        
> buttonbox.Add(self.record_control, 0, wx.CENTER)
> 
> .
> .
> .
> 
>     #
>     # Turn recording on/off
>     # Called-back by "Recording" button
>     #
>     def toggle_recording(self):
>         # Pick up localtime, for
> generating filenames
>         timestamp = time.localtime()
> 
>         # Generate filenames for both
> data and header file
>         filename =
> "%04d_%02d_%02d_%02d:%02d:%02d.dat" % (timestamp.tm_year,
> timestamp.tm_mon,
>         timestamp.tm_mday,
> timestamp.tm_hour, timestamp.tm_min,timestamp.tm_sec)
> 
>         # Current recording?  Flip
> state
>         if (self.recording_state ==
> True):
>           self.recording_state =
> False
>          
> self.record_control.SetLabel("Recording Data: Off 
>                
>                
>                
>   ")
>           self.recording.close()
>         # Not recording?
>         else:
>           self.recording_state =
> True
>          
> self.record_control.SetLabel("Recording Data to:
> "+filename)
> 
>           # Cause gr_file_sink
> object to accept new filename
>           #   note
> use of self.prefix--filename prefix from
>          
> #   command line (defaults to ./)
>           #
>           self.recording.open
> (self.prefix+filename)
> 
> 
> Thanks!
> eric
> 
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?

Thanks!
eric
> 
> 
>       
> 
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