Re: [Discuss-gnuradio] Problem writing custom null sync block

[Martin Braun (CEL)]

On Fri, Feb 22, 2013 at 09:09:19AM -0500, Tom Rondeau wrote:
> > ####
> > class file_writer(gr.sync_block):
> >         ## CTOR
> >         #
> >         def __init__(self, filename, vec_size):
> >                 gr.sync_block.__init__(
> >                                 self,
> >                                 "file name block",
> >                                 in_sig = [np.dtype((np.float32, vec_size))],
> >                                 out_sig = None
> >                                 )
> >
> >                 self._fd = open(filename, 'w')
> >                 self._filename = filename
> >
> >
> >         def work(self, input_items, output_items):
> >                 in0 = input_items[0]
> >
> >                 print "###### ",  len(in0)
> >                 print in0
> >
> >                 return len(output_items)
> 
> What is the length of output_items? Because you don't have an output
> buffer attached to this block, I'd be concerned that len(output_items)
> == 0, so you're telling the scheduler that you aren't consuming any
> data. Maybe just replace that last line with 'return
> len(input_items)'?

It's probably 'len(in0)', as len(input_items) would return the number of
input ports. 'len(output_items[0])' would probably also work.

MB

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Communications Engineering Lab (CEL)

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