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

From: ematlis
Subject: [Discuss-gnuradio] filename using time-stamp in GRC
Date: Wed, 19 Jan 2011 10:47:04 -0800 (PST)

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.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                                        

        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_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                     
        # Not recording?
          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)



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