Re: [Discuss-gnuradio] AttributeError: No constructor defined for tagged_stream_block (Python)

[Sebastian Sahlin]

Hmm ok, I feel like perhaps I've misunderstood some fundamental mechanic of GNURadio.. is it within my power to define the exact number of samples that should be available on the next call to the work function of e.g. a sync block?

Den tis 28 maj 2019 kl 16:28 skrev Müller, Marcus (CEL) <address@hidden>:

But you're free to do that in any block you desire, so you can write a
normal sync block and just always consume all input :)
On Tue, 2019-05-28 at 16:26 +0200, Sebastian Sahlin wrote:
> Hi,
>
> I suppose not - I just figured that using a tagged stream block would be useful since then I'd be able to iterate over the entire packet in one work function call.
>
> Den tis 28 maj 2019 kl 16:22 skrev Müller, Marcus (CEL) <address@hidden>:
> > But that block doesn't have to be a Tagged Stream Block itself, right?
> > On Tue, 2019-05-28 at 16:14 +0200, Sebastian Sahlin wrote:
> > > Hi Marcus,
> > >
> > > Aha, that explains it.. bummer! Perhaps you could advise me on an alternative solution to my problem. What I am trying to achieve with the tagged stream block is to apply tags at an interval on a packet; the values are taken from an array that I want to iterate over. However, since the work function has no "memory" I am unsure how to solve iterating over the array.     
> > >
> > > Den tis 28 maj 2019 kl 16:04 skrev Müller, Marcus (CEL) <address@hidden>:
> > > > Hi Sebastian,
> > > >
> > > > I must admit that I don't remember whether the TSB block base was
> > > > correctly wrapped for Python (darn it, first I write something, and
> > > > then you find a glaring counterexample); in fact, there's not a single
> > > > test case for that in the main GNU Radio tree, which probably means
> > > > "no".
> > > >
> > > > Best regards,
> > > > Marcus
> > > >
> > > > On Tue, 2019-05-28 at 14:41 +0200, Sebastian Sahlin wrote:
> > > > > Hi,
> > > > >
> > > > > I'm attempting to create a tagged stream block in Python using the following constructor:
> > > > >
> > > > > class test_tagged_stream(gr.tagged_stream_block):
> > > > >     def __init__(self, test_param):
> > > > >         gr.tagged_stream_block.__init__(self,
> > > > >             name="test_tagged_stream",
> > > > >             in_sig=[numpy.complex64],
> > > > >             out_sig=[numpy.complex64],
> > > > >             length_tag_key="test_tag")
> > > > >
> > > > > However Python is throwing "AttributeError: No constructor defined" at me. Is there some glaringly obvious error in the above code? I am using the input argument list as defined at https://www.gnuradio.org/doc/doxygen/classgr_1_1tagged__stream__block.html#a601cd4073e9c3e6317b5ecc5e2e5871b
> > > > >
> > > > > Regards
> > > > >
> > > > >
> > > > >
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