Re: [Discuss-gnuradio] Using io_signatures in Python Sync Blocks

[Martin Braun]

hier_block should be fine, since it maps directly to the C++ API.

-- M


On 01/26/2017 02:11 PM, Richard Mcallister wrote:
> Thanks! I was kinda assuming at this point it wasn't supported, because
> of a lack of examples, but I wanted to check since the documentation
> didn't say one way or the other. I never thought to check the gateway.
> 
> I'm assuming this means it wouldn't work with a hier_block either?
> 
> On Thu, Jan 26, 2017 at 5:44 AM, Martin Braun <address@hidden
> <mailto:address@hidden>> wrote:
> 
>     Richard,
> 
>     looks like the Python gateway assumes a fixed list of ports:
> 
>     
> https://github.com/gnuradio/gnuradio/blob/6225e5d4d1edd67c896c6c43bdc584a078480a8d/gnuradio-runtime/python/gnuradio/gr/gateway.py#L98-L103
>     
> <https://github.com/gnuradio/gnuradio/blob/6225e5d4d1edd67c896c6c43bdc584a078480a8d/gnuradio-runtime/python/gnuradio/gr/gateway.py#L98-L103>
> 
>     Seems what you're trying is not supported :/
> 
>     -- M
> 
>     On 01/24/2017 07:33 PM, Richard Mcallister wrote:
>     > So I've done the tutorials in the past and have created my own OOT
>     > modules before. I know that for the standard sync, decim, and interp
>     > blocks you simply declare the input and output ports in
>     > gr.sync/block.//init/_ such as for this:
>     >
>     > gr.sync/block.//init/_(self,name='example', in_sig=[...], out_sig=[])
>     >
>     > My question is how do you do you deal with blocks with a variable amount
>     > of ports? When coding in a C++, you can just use
>     > gr_signature(<Min>,<Max>, size) in the code. Is it possible to pass
>     > arguments to the gr_signature from the Python, or if I wanted this,
>     > would I have to code this in C++. the only examples I've seen that call
>     > gr_signature in Python are for hier_blocks, but since I'm using custom
>     > blocks, wouldn't I end up back at square one? (Since the block I'm
>     > updating has a fixed number of ports, even if the hier block did not,
>     > the block inside would crash with too many inputs).
>     >
>     > Also, the block itself I want has no max number of ports, so for the
>     > io_signature, I believe I put -1 as the argument for max?
>     >
>     >
>     > -Richard McAllister
>     >
>     >
>     >
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