Re: [Discuss-gnuradio] Implementing callbacks in custom blocks

[Johannes Demel]

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hey,

I'm not entirely sure if it still holds true, but that might be an
error related to SWIG. For some reason virtual header files don't get
swig'ed again unless explicitly triggered. Just do a 'make clean' and
'make' again. That should rebuild your module from scratch and also
swig your headers.

happy hacking
Johannes

On 20.07.2014 07:58, jsam45 wrote:
> Using gr_modtool, I am trying to make a simple Gain block (called
> var_gain) which multiplies the input with a constant. I have a
> private variable called d_gain in the var_gain_impl class and a
> public function set_gain(float gain) which sets the value of d_gain
> to the argument. I modified the xml file by adding the line 
> <callback>set_gain($gain)</callback> after the <make> line.
> 
> During execution, gain value does not change even after changing it
> through a WX Slider. If I run it from terminal, I am getting the
> following error - Traceback (most recent call last): File 
> "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/forms/forms.py",
> line 180, in _handle def _handle(self, event): self[INT_KEY] =
> self._slider.GetValue() File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/pubsub.py",
> line 52, in __setitem__ sub(val) File 
> "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/forms/forms.py",
> line 138, in _translate_internal_to_external if self._callback:
> self._callback(self[EXT_KEY]) File "top_block.py", line 102, in
> set_gg self.fsk_var_gain_0.set_gain(self.gg) AttributeError:
> 'var_gain_sptr' object has no attribute 'set_gain'
> 
> I tried looking at some in-built blocks to see how callback is
> implemented. Then I saw that the in-built blocks have pure virtual
> functions in the include/module_name/var_gain.h header file. I
> tried implementing that but the result is still the same. What am I
> missing here?
> 
> 
> 
> -- View this message in context:
> http://gnuradio.4.n7.nabble.com/Implementing-callbacks-in-custom-blocks-tp49462.html
>
> 
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> 
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