Exception running GNU module "op25_grc.py" : AttributeError: 'gr_hier_block2_sptr' object has no attribute 'set_callback'

matt.doolittle33 at gmail.com matt.doolittle33 at gmail.com
Fri Feb 15 20:00:40 CET 2013


I am using using ubuntu 12.10 i am trying to run a python block, namely OP25, in GNU Radio Companion v3.6.3-35-g4435082f, which uses python version 2.7.3 for some reason although python3.2 is in the lib folder. I run the following trace command in terminal:

~$ python -m trace --count -C . op25_grc.py

Here is the output with an error:

Imported legacy fsk4
 Using Volk machine: ssse3_32
 Traceback (most recent call last):
 File "/usr/lib/python2.7/runpy.py", line 162, in run_module_as_main
 "_main__", fname, loader, pkg_name)
 File "/usr/lib/python2.7/runpy.py", line 72, in run_code
 exec code in run_globals
 File "/usr/lib/python2.7/trace.py", line 819, in
 main()
 File "/usr/lib/python2.7/trace.py", line 807, in main
 t.runctx(code, globs, globs)
 File "/usr/lib/python2.7/trace.py", line 513, in runctx
 exec cmd in globals, locals
 File "op25_grc.py", line 493, in
 tb = op25_grc()
 File "op25_grc.py", line 231, in __init_
 self.wxgui_fftsink2_0_0.set_callback(wxgui_fftsink2_0_0_callback)
 File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/hier_block2.py", line 54, in getattr
 return getattr(self._hb, name)
 AttributeError: 'gr_hier_block2_sptr' object has no attribute 'set_callback'

The code for "op25_grc.py":

#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: Op25 Grc
# Generated: Wed Feb 13 19:37:41 2013
##################################################

from baz import message_callback
from baz import op25
from gnuradio import audio
from gnuradio import blks2
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import window
from gnuradio.eng_option import eng_option
from gnuradio.gr import firdes
from gnuradio.wxgui import fftsink2
from gnuradio.wxgui import forms
from gnuradio.wxgui import scopesink2
from gnuradio.wxgui import waterfallsink2
from grc_gnuradio import wxgui as grc_wxgui
from optparse import OptionParser
import ConfigParser
import math
import wx

class op25_grc(grc_wxgui.top_block_gui):

	def __init__(self):
		grc_wxgui.top_block_gui.__init__(self, title="Op25 Grc")
		_icon_path = "/usr/share/icons/hicolor/32x32/apps/gnuradio-grc.png"
		self.SetIcon(wx.Icon(_icon_path, wx.BITMAP_TYPE_ANY))

		##################################################
		# Variables
		##################################################
		self._config_freq_config = ConfigParser.ConfigParser()
		self._config_freq_config.read(".grc_op25")
		try: config_freq = self._config_freq_config.getfloat("main", "freq")
		except: config_freq = 434075000
		self.config_freq = config_freq
		self.freq = freq = config_freq
		self._config_xlate_offset_config = ConfigParser.ConfigParser()
		self._config_xlate_offset_config.read(".grc_op25")
		try: config_xlate_offset = self._config_xlate_offset_config.getfloat("main", "xlate_offset")
		except: config_xlate_offset = 0
		self.config_xlate_offset = config_xlate_offset
		self.click_freq = click_freq = freq-config_xlate_offset
		self.xlate_offset_fine = xlate_offset_fine = 0
		self.xlate_offset = xlate_offset = freq-click_freq
		self.samp_rate = samp_rate = 48000
		self.samp_per_sym = samp_per_sym = 5+1
		self.decim = decim = 20
		self._config_xlate_bandwidth_config = ConfigParser.ConfigParser()
		self._config_xlate_bandwidth_config.read(".grc_rtl")
		try: config_xlate_bandwidth = self._config_xlate_bandwidth_config.getfloat("main", "xlate_bandwidth")
		except: config_xlate_bandwidth = 24000
		self.config_xlate_bandwidth = config_xlate_bandwidth
		self.auto_tune_offset = auto_tune_offset = 0
		self.xlate_bandwidth = xlate_bandwidth = config_xlate_bandwidth
		self.variable_static_text_0 = variable_static_text_0 = freq+xlate_offset+xlate_offset_fine+auto_tune_offset
		self.pre_channel_rate = pre_channel_rate = samp_rate/decim
		self.gain = gain = 20
		self.fine_click_freq = fine_click_freq = 0
		self.channel_rate = channel_rate = op25.SYMBOL_RATE*samp_per_sym
		self.auto_tune_offset_freq = auto_tune_offset_freq = auto_tune_offset*op25.SYMBOL_DEVIATION
		self.audio_mul = audio_mul = 2

		##################################################
		# Message Queues
		##################################################
		op25_decoder_0_msgq_out = baz_message_callback_0_msgq_in = gr.msg_queue(2)

		##################################################
		# Blocks
		##################################################
		_xlate_offset_fine_sizer = wx.BoxSizer(wx.VERTICAL)
		self._xlate_offset_fine_text_box = forms.text_box(
			parent=self.GetWin(),
			sizer=_xlate_offset_fine_sizer,
			value=self.xlate_offset_fine,
			callback=self.set_xlate_offset_fine,
			label="Fine Offset",
			converter=forms.float_converter(),
			proportion=0,
		)
		self._xlate_offset_fine_slider = forms.slider(
			parent=self.GetWin(),
			sizer=_xlate_offset_fine_sizer,
			value=self.xlate_offset_fine,
			callback=self.set_xlate_offset_fine,
			minimum=-10000,
			maximum=10000,
			num_steps=1000,
			style=wx.SL_HORIZONTAL,
			cast=float,
			proportion=1,
		)
		self.Add(_xlate_offset_fine_sizer)
		self._xlate_offset_text_box = forms.text_box(
			parent=self.GetWin(),
			value=self.xlate_offset,
			callback=self.set_xlate_offset,
			label="Xlate Offset",
			converter=forms.float_converter(),
		)
		self.Add(self._xlate_offset_text_box)
		_xlate_bandwidth_sizer = wx.BoxSizer(wx.VERTICAL)
		self._xlate_bandwidth_text_box = forms.text_box(
			parent=self.GetWin(),
			sizer=_xlate_bandwidth_sizer,
			value=self.xlate_bandwidth,
			callback=self.set_xlate_bandwidth,
			label="Xlate BW",
			converter=forms.float_converter(),
			proportion=0,
		)
		self._xlate_bandwidth_slider = forms.slider(
			parent=self.GetWin(),
			sizer=_xlate_bandwidth_sizer,
			value=self.xlate_bandwidth,
			callback=self.set_xlate_bandwidth,
			minimum=5000,
			maximum=50000,
			num_steps=1000,
			style=wx.SL_HORIZONTAL,
			cast=float,
			proportion=1,
		)
		self.Add(_xlate_bandwidth_sizer)
		self.nb = self.nb = wx.Notebook(self.GetWin(), style=wx.NB_TOP)
		self.nb.AddPage(grc_wxgui.Panel(self.nb), "BB-1")
		self.nb.AddPage(grc_wxgui.Panel(self.nb), "BB-2")
		self.nb.AddPage(grc_wxgui.Panel(self.nb), "Xlate-1")
		self.nb.AddPage(grc_wxgui.Panel(self.nb), "Xlate-2")
		self.nb.AddPage(grc_wxgui.Panel(self.nb), "4FSK")
		self.nb.AddPage(grc_wxgui.Panel(self.nb), "Dibits")
		self.Add(self.nb)
		self._auto_tune_offset_freq_static_text = forms.static_text(
			parent=self.GetWin(),
			value=self.auto_tune_offset_freq,
			callback=self.set_auto_tune_offset_freq,
			label="Auto tune",
			converter=forms.float_converter(),
		)
		self.Add(self._auto_tune_offset_freq_static_text)
		_audio_mul_sizer = wx.BoxSizer(wx.VERTICAL)
		self._audio_mul_text_box = forms.text_box(
			parent=self.GetWin(),
			sizer=_audio_mul_sizer,
			value=self.audio_mul,
			callback=self.set_audio_mul,
			label="Audio mul",
			converter=forms.float_converter(),
			proportion=0,
		)
		self._audio_mul_slider = forms.slider(
			parent=self.GetWin(),
			sizer=_audio_mul_sizer,
			value=self.audio_mul,
			callback=self.set_audio_mul,
			minimum=0,
			maximum=10,
			num_steps=100,
			style=wx.SL_HORIZONTAL,
			cast=float,
			proportion=1,
		)
		self.Add(_audio_mul_sizer)
		self.wxgui_waterfallsink2_0_0 = waterfallsink2.waterfall_sink_c(
			self.nb.GetPage(3).GetWin(),
			baseband_freq=0,
			dynamic_range=100,
			ref_level=50,
			ref_scale=2.0,
			sample_rate=channel_rate,
			fft_size=512,
			fft_rate=15,
			average=False,
			avg_alpha=None,
			title="Waterfall Plot",
		)
		self.nb.GetPage(3).Add(self.wxgui_waterfallsink2_0_0.win)
		self.wxgui_scopesink2_1 = scopesink2.scope_sink_f(
			self.nb.GetPage(4).GetWin(),
			title="Scope Plot",
			sample_rate=channel_rate,
			v_scale=1.5,
			v_offset=0,
			t_scale=0.05,
			ac_couple=False,
			xy_mode=False,
			num_inputs=1,
			trig_mode=gr.gr_TRIG_MODE_AUTO,
			y_axis_label="Counts",
		)
		self.nb.GetPage(4).Add(self.wxgui_scopesink2_1.win)
		self.wxgui_scopesink2_0 = scopesink2.scope_sink_f(
			self.nb.GetPage(5).GetWin(),
			title="Scope Plot",
			sample_rate=op25.SYMBOL_RATE,
			v_scale=1,
			v_offset=0,
			t_scale=0.05,
			ac_couple=False,
			xy_mode=False,
			num_inputs=1,
			trig_mode=gr.gr_TRIG_MODE_AUTO,
			y_axis_label="Counts",
		)
		self.nb.GetPage(5).Add(self.wxgui_scopesink2_0.win)
		self.wxgui_fftsink2_0_0 = fftsink2.fft_sink_c(
			self.nb.GetPage(2).GetWin(),
			baseband_freq=fine_click_freq,
			y_per_div=10,
			y_divs=10,
			ref_level=0,
			ref_scale=2.0,
			sample_rate=channel_rate,
			fft_size=1024,
			fft_rate=30,
			average=True,
			avg_alpha=None,
			title="FFT Plot",
			peak_hold=False,
		)
		self.nb.GetPage(2).Add(self.wxgui_fftsink2_0_0.win)
		def wxgui_fftsink2_0_0_callback(x, y):
			self.set_fine_click_freq(x)
		
		self.wxgui_fftsink2_0_0.set_callback(wxgui_fftsink2_0_0_callback)
		self._variable_static_text_0_static_text = forms.static_text(
			parent=self.GetWin(),
			value=self.variable_static_text_0,
			callback=self.set_variable_static_text_0,
			label="Final freq",
			converter=forms.float_converter(),
		)
		self.Add(self._variable_static_text_0_static_text)
		self.op25_decoder_0 = op25.op25_decoder(channel_rate=channel_rate, defer_creation=True, output_dibits=True, key="")
		self.op25_decoder_0.auto_tune_msgq = op25_decoder_0_msgq_out
		self.op25_decoder_0.create()
		self.gr_quadrature_demod_cf_0 = gr.quadrature_demod_cf((channel_rate/(2.0 * math.pi * op25.SYMBOL_DEVIATION)))
		self.gr_multiply_const_vxx_0 = gr.multiply_const_vff((audio_mul, ))
		self.gr_freq_xlating_fir_filter_xxx_0 = gr.freq_xlating_fir_filter_fcf(decim, (firdes.low_pass(1, samp_rate, xlate_bandwidth/2, 1000)), xlate_offset+xlate_offset_fine-fine_click_freq-auto_tune_offset_freq, samp_rate)
		self.gr_fir_filter_xxx_0 = gr.fir_filter_fff(1, ((1.0/samp_per_sym,)*samp_per_sym))
		_gain_sizer = wx.BoxSizer(wx.VERTICAL)
		self._gain_text_box = forms.text_box(
			parent=self.GetWin(),
			sizer=_gain_sizer,
			value=self.gain,
			callback=self.set_gain,
			label="Gain",
			converter=forms.float_converter(),
			proportion=0,
		)
		self._gain_slider = forms.slider(
			parent=self.GetWin(),
			sizer=_gain_sizer,
			value=self.gain,
			callback=self.set_gain,
			minimum=0,
			maximum=50,
			num_steps=100,
			style=wx.SL_HORIZONTAL,
			cast=float,
			proportion=1,
		)
		self.Add(_gain_sizer)
		self._freq_text_box = forms.text_box(
			parent=self.GetWin(),
			value=self.freq,
			callback=self.set_freq,
			label="Frequency",
			converter=forms.float_converter(),
		)
		self.Add(self._freq_text_box)
		self.blks2_rational_resampler_xxx_1 = blks2.rational_resampler_ccc(
			interpolation=channel_rate,
			decimation=pre_channel_rate,
			taps=None,
			fractional_bw=None,
		)
		self.blks2_rational_resampler_xxx_0 = blks2.rational_resampler_fff(
			interpolation=44100,
			decimation=8000,
			taps=None,
			fractional_bw=None,
		)
		self.baz_message_callback_0 = message_callback.message_callback(msgq=baz_message_callback_0_msgq_in,  callback=auto_tune_offset
			, msg_part="arg1", custom_parts="", dummy=False)
			
		self.audio_source_0 = audio.source(samp_rate, "plughw:0,0", True)
		self.audio_sink_0 = audio.sink(44100, "", True)

		##################################################
		# Connections
		##################################################
		self.connect((self.gr_freq_xlating_fir_filter_xxx_0, 0), (self.blks2_rational_resampler_xxx_1, 0))
		self.connect((self.blks2_rational_resampler_xxx_1, 0), (self.wxgui_fftsink2_0_0, 0))
		self.connect((self.blks2_rational_resampler_xxx_1, 0), (self.wxgui_waterfallsink2_0_0, 0))
		self.connect((self.blks2_rational_resampler_xxx_1, 0), (self.gr_quadrature_demod_cf_0, 0))
		self.connect((self.gr_quadrature_demod_cf_0, 0), (self.gr_fir_filter_xxx_0, 0))
		self.connect((self.gr_fir_filter_xxx_0, 0), (self.op25_decoder_0, 0))
		self.connect((self.blks2_rational_resampler_xxx_0, 0), (self.gr_multiply_const_vxx_0, 0))
		self.connect((self.gr_multiply_const_vxx_0, 0), (self.audio_sink_0, 0))
		self.connect((self.op25_decoder_0, 1), (self.wxgui_scopesink2_0, 0))
		self.connect((self.gr_fir_filter_xxx_0, 0), (self.wxgui_scopesink2_1, 0))
		self.connect((self.op25_decoder_0, 0), (self.blks2_rational_resampler_xxx_0, 0))
		self.connect((self.audio_source_0, 0), (self.gr_freq_xlating_fir_filter_xxx_0, 0))


	def get_config_freq(self):
		return self.config_freq

	def set_config_freq(self, config_freq):
		self.config_freq = config_freq
		self.set_freq(self.config_freq)

	def get_freq(self):
		return self.freq

	def set_freq(self, freq):
		self.freq = freq
		self._config_freq_config = ConfigParser.ConfigParser()
		self._config_freq_config.read(".grc_op25")
		if not self._config_freq_config.has_section("main"):
			self._config_freq_config.add_section("main")
		self._config_freq_config.set("main", "freq", str(self.freq))
		self._config_freq_config.write(open(".grc_op25", 'w'))
		self.set_variable_static_text_0(self.freq+self.xlate_offset+self.xlate_offset_fine+self.auto_tune_offset)
		self._freq_text_box.set_value(self.freq)
		self.set_xlate_offset(self.freq-self.click_freq)
		self.set_click_freq(self.freq-self.config_xlate_offset)

	def get_config_xlate_offset(self):
		return self.config_xlate_offset

	def set_config_xlate_offset(self, config_xlate_offset):
		self.config_xlate_offset = config_xlate_offset
		self.set_click_freq(self.freq-self.config_xlate_offset)

	def get_click_freq(self):
		return self.click_freq

	def set_click_freq(self, click_freq):
		self.click_freq = click_freq
		self.set_xlate_offset(self.freq-self.click_freq)

	def get_xlate_offset_fine(self):
		return self.xlate_offset_fine

	def set_xlate_offset_fine(self, xlate_offset_fine):
		self.xlate_offset_fine = xlate_offset_fine
		self._config_xlate_offset_config = ConfigParser.ConfigParser()
		self._config_xlate_offset_config.read(".grc_op25")
		if not self._config_xlate_offset_config.has_section("main"):
			self._config_xlate_offset_config.add_section("main")
		self._config_xlate_offset_config.set("main", "xlate_offset", str(self.xlate_offset+self.xlate_offset_fine))
		self._config_xlate_offset_config.write(open(".grc_op25", 'w'))
		self.set_variable_static_text_0(self.freq+self.xlate_offset+self.xlate_offset_fine+self.auto_tune_offset)
		self._xlate_offset_fine_slider.set_value(self.xlate_offset_fine)
		self._xlate_offset_fine_text_box.set_value(self.xlate_offset_fine)
		self.gr_freq_xlating_fir_filter_xxx_0.set_center_freq(self.xlate_offset+self.xlate_offset_fine-self.fine_click_freq-self.auto_tune_offset_freq)

	def get_xlate_offset(self):
		return self.xlate_offset

	def set_xlate_offset(self, xlate_offset):
		self.xlate_offset = xlate_offset
		self._config_xlate_offset_config = ConfigParser.ConfigParser()
		self._config_xlate_offset_config.read(".grc_op25")
		if not self._config_xlate_offset_config.has_section("main"):
			self._config_xlate_offset_config.add_section("main")
		self._config_xlate_offset_config.set("main", "xlate_offset", str(self.xlate_offset+self.xlate_offset_fine))
		self._config_xlate_offset_config.write(open(".grc_op25", 'w'))
		self.set_variable_static_text_0(self.freq+self.xlate_offset+self.xlate_offset_fine+self.auto_tune_offset)
		self._xlate_offset_text_box.set_value(self.xlate_offset)
		self.gr_freq_xlating_fir_filter_xxx_0.set_center_freq(self.xlate_offset+self.xlate_offset_fine-self.fine_click_freq-self.auto_tune_offset_freq)

	def get_samp_rate(self):
		return self.samp_rate

	def set_samp_rate(self, samp_rate):
		self.samp_rate = samp_rate
		self.set_pre_channel_rate(self.samp_rate/self.decim)
		self.gr_freq_xlating_fir_filter_xxx_0.set_taps((firdes.low_pass(1, self.samp_rate, self.xlate_bandwidth/2, 1000)))

	def get_samp_per_sym(self):
		return self.samp_per_sym

	def set_samp_per_sym(self, samp_per_sym):
		self.samp_per_sym = samp_per_sym
		self.set_channel_rate(op25.SYMBOL_RATE*self.samp_per_sym)
		self.gr_fir_filter_xxx_0.set_taps(((1.0/self.samp_per_sym,)*self.samp_per_sym))

	def get_decim(self):
		return self.decim

	def set_decim(self, decim):
		self.decim = decim
		self.set_pre_channel_rate(self.samp_rate/self.decim)

	def get_config_xlate_bandwidth(self):
		return self.config_xlate_bandwidth

	def set_config_xlate_bandwidth(self, config_xlate_bandwidth):
		self.config_xlate_bandwidth = config_xlate_bandwidth
		self.set_xlate_bandwidth(self.config_xlate_bandwidth)

	def get_auto_tune_offset(self):
		return self.auto_tune_offset

	def set_auto_tune_offset(self, auto_tune_offset):
		self.auto_tune_offset = auto_tune_offset
		self.set_variable_static_text_0(self.freq+self.xlate_offset+self.xlate_offset_fine+self.auto_tune_offset)
		self.set_auto_tune_offset_freq(self.auto_tune_offset*op25.SYMBOL_DEVIATION)

	def get_xlate_bandwidth(self):
		return self.xlate_bandwidth

	def set_xlate_bandwidth(self, xlate_bandwidth):
		self.xlate_bandwidth = xlate_bandwidth
		self._config_xlate_bandwidth_config = ConfigParser.ConfigParser()
		self._config_xlate_bandwidth_config.read(".grc_rtl")
		if not self._config_xlate_bandwidth_config.has_section("main"):
			self._config_xlate_bandwidth_config.add_section("main")
		self._config_xlate_bandwidth_config.set("main", "xlate_bandwidth", str(self.xlate_bandwidth))
		self._config_xlate_bandwidth_config.write(open(".grc_rtl", 'w'))
		self._xlate_bandwidth_slider.set_value(self.xlate_bandwidth)
		self._xlate_bandwidth_text_box.set_value(self.xlate_bandwidth)
		self.gr_freq_xlating_fir_filter_xxx_0.set_taps((firdes.low_pass(1, self.samp_rate, self.xlate_bandwidth/2, 1000)))

	def get_variable_static_text_0(self):
		return self.variable_static_text_0

	def set_variable_static_text_0(self, variable_static_text_0):
		self.variable_static_text_0 = variable_static_text_0
		self._variable_static_text_0_static_text.set_value(self.variable_static_text_0)

	def get_pre_channel_rate(self):
		return self.pre_channel_rate

	def set_pre_channel_rate(self, pre_channel_rate):
		self.pre_channel_rate = pre_channel_rate

	def get_gain(self):
		return self.gain

	def set_gain(self, gain):
		self.gain = gain
		self._gain_slider.set_value(self.gain)
		self._gain_text_box.set_value(self.gain)

	def get_fine_click_freq(self):
		return self.fine_click_freq

	def set_fine_click_freq(self, fine_click_freq):
		self.fine_click_freq = fine_click_freq
		self.wxgui_fftsink2_0_0.set_baseband_freq(self.fine_click_freq)
		self.gr_freq_xlating_fir_filter_xxx_0.set_center_freq(self.xlate_offset+self.xlate_offset_fine-self.fine_click_freq-self.auto_tune_offset_freq)

	def get_channel_rate(self):
		return self.channel_rate

	def set_channel_rate(self, channel_rate):
		self.channel_rate = channel_rate
		self.wxgui_scopesink2_1.set_sample_rate(self.channel_rate)
		self.gr_quadrature_demod_cf_0.set_gain((self.channel_rate/(2.0 * math.pi * op25.SYMBOL_DEVIATION)))
		self.wxgui_fftsink2_0_0.set_sample_rate(self.channel_rate)
		self.wxgui_waterfallsink2_0_0.set_sample_rate(self.channel_rate)

	def get_auto_tune_offset_freq(self):
		return self.auto_tune_offset_freq

	def set_auto_tune_offset_freq(self, auto_tune_offset_freq):
		self.auto_tune_offset_freq = auto_tune_offset_freq
		self._auto_tune_offset_freq_static_text.set_value(self.auto_tune_offset_freq)
		self.gr_freq_xlating_fir_filter_xxx_0.set_center_freq(self.xlate_offset+self.xlate_offset_fine-self.fine_click_freq-self.auto_tune_offset_freq)

	def get_audio_mul(self):
		return self.audio_mul

	def set_audio_mul(self, audio_mul):
		self.audio_mul = audio_mul
		self._audio_mul_slider.set_value(self.audio_mul)
		self._audio_mul_text_box.set_value(self.audio_mul)
		self.gr_multiply_const_vxx_0.set_k((self.audio_mul, ))

if __name__ == '__main__':
	parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
	(options, args) = parser.parse_args()
	tb = op25_grc()
	tb.Run(True)


and the code from "hier_block2_.py":

#
# Copyright 2006,2007 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING.  If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#

from gnuradio_core import hier_block2_swig
try:
    import pmt
except ImportError:
    from gruel import pmt

#
# This hack forces a 'has-a' relationship to look like an 'is-a' one.
#
# It allows Python classes to subclass this one, while passing through
# method calls to the C++ class shared pointer from SWIG.
#
# It also allows us to intercept method calls if needed
#
class hier_block2(object):
    """
    Python wrapper around the C++ hierarchical block implementation.
    Provides convenience functions and allows proper Python subclassing.
    """

    def __init__(self, name, input_signature, output_signature):
        """
        Create a hierarchical block with a given name and I/O signatures.
        """
	self._hb = hier_block2_swig(name, input_signature, output_signature)

    def __getattr__(self, name):
        """
        Pass-through member requests to the C++ object.
        """
        if not hasattr(self, "_hb"):
            raise RuntimeError("hier_block2: invalid state--did you forget to call gr.hier_block2.__init__ in a derived class?")
	return getattr(self._hb, name)

    def connect(self, *points):
        """
        Connect two or more block endpoints.  An endpoint is either a (block, port)
        tuple or a block instance.  In the latter case, the port number is assumed
        to be zero.

        To connect the hierarchical block external inputs or outputs to internal block
        inputs or outputs, use 'self' in the connect call.

        If multiple arguments are provided, connect will attempt to wire them in series,
        interpreting the endpoints as inputs or outputs as appropriate.
        """

        if len (points) < 1:
            raise ValueError, ("connect requires at least one endpoint; %d provided." % (len (points),))
	else:
	    if len(points) == 1:
		self._hb.primitive_connect(points[0].to_basic_block())
	    else:
		for i in range (1, len (points)):
        	    self._connect(points[i-1], points[i])

    def _connect(self, src, dst):
        (src_block, src_port) = self._coerce_endpoint(src)
        (dst_block, dst_port) = self._coerce_endpoint(dst)
        self._hb.primitive_connect(src_block.to_basic_block(), src_port,
                                   dst_block.to_basic_block(), dst_port)

    def _coerce_endpoint(self, endp):
        if hasattr(endp, 'to_basic_block'):
            return (endp, 0)
        else:
            if hasattr(endp, "__getitem__") and len(endp) == 2:
                return endp # Assume user put (block, port)
            else:
                raise ValueError("unable to coerce endpoint")

    def disconnect(self, *points):
        """
        Disconnect two endpoints in the flowgraph.

        To disconnect the hierarchical block external inputs or outputs to internal block
        inputs or outputs, use 'self' in the connect call.

        If more than two arguments are provided, they are disconnected successively.
        """

        if len (points) < 1:
            raise ValueError, ("disconnect requires at least one endpoint; %d provided." % (len (points),))
        else:
            if len (points) == 1:
                self._hb.primitive_disconnect(points[0].to_basic_block())
            else:
                for i in range (1, len (points)):
                    self._disconnect(points[i-1], points[i])

    def _disconnect(self, src, dst):
        (src_block, src_port) = self._coerce_endpoint(src)
        (dst_block, dst_port) = self._coerce_endpoint(dst)
        self._hb.primitive_disconnect(src_block.to_basic_block(), src_port,
                                      dst_block.to_basic_block(), dst_port)

    def msg_connect(self, src, srcport, dst, dstport):
        self.primitive_msg_connect(src.to_basic_block(), srcport, dst.to_basic_block(), dstport);

    def msg_disconnect(self, src, srcport, dst, dstport):
        self.primitive_msg_disconnect(src.to_basic_block(), srcport, dst.to_basic_block(), dstport);

    def message_port_register_hier_in(self, portname):
        self.primitive_message_port_register_hier_in(pmt.pmt_intern(portname));

    def message_port_register_hier_out(self, portname):
        self.primitive_message_port_register_hier_out(pmt.pmt_intern(portname));


My goal is to fix the error: AttributeError: "'gr_hier_block2_sptr' object has no attribute 'set_callback'" so that the block "op25_grc.py" will run in GNU radio companion.  

i have been unable to find any sort of solution to this problem anywhere.  some have said its a version problem with GNUradio but as i posted above i have the latest version.

Any help will be greatly appreciated.  Thank you very much!



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