Re: [Discuss-gnuradio] Printing gr_vector_sink_f data

[Josh Blum]

On 09/22/2010 12:01 PM, sirjanselot wrote:
> Hello,
>
> I tried to print what data gr_vector_sink_f contains in the following code:
>
> #!/usr/bin/env python
>
> import howto
> from gnuradio import gr, gru
> from gnuradio.gr import firdes
> from optparse import OptionParser
> from gnuradio import blks2
>
> class howto_square (gr.top_block):
>         def __init__(self):
>                 gr.top_block.__init__(self)
>                 src_data = (-3, 4, -5.5, 2, 3)
>                 expected_result = (9, 16, 30.25, 4, 9)
>                 src = gr.vector_source_f (src_data)
>                 sqr = howto.square_ff ()
>                 dst = gr.vector_sink_f ()
>                 self.connect (src, sqr)
>                 self.connect (sqr, dst)
>                 self.result_data = dst.data()

right here, you collect the data before running the flow graph

-josh

>                                 
>         def print_data(self):
>                 print self.result_data
>
> if __name__ == '__main__':
>         #parser = OptionParser(option_class=eng_option, usage="%prog: 
> [options]")
>         #(options, args) = parser.parse_args()
>         hw = howto_square()
>         hw.run()
>         hw.print_data()
>
> But it is always empty.
>
> Any thoughts?
>
> Thanks