Re: [Discuss-gnuradio] Cannot get Socket-to-blob and blob-to-Socket to work with float values

[Josh Blum]

On 07/10/2012 09:34 AM, Tommy Tracy wrote:
> Hello everyone,
> 
>     I'm doing some work with Josh Blum's extras. Basically, I made the
> easiest possible message-passing program I could think of.
> 

Floats have a size of 4 bytes.
You should set the item size parameter to 4.

-josh

> Signal Source [sample:44.1k, freq:1k]  ----(float)----> Extras: Blob
> to Socket[UDP, 127.0.0.1, 12345]
> 
> Extras: Socket to Blob[UDP, 127.0.0.1, 12345] -----(float)------>Audio
> Sink[sample:44.1k]
> 
> When I attempt to run this, I get the following error message:
> 
>   File "/home/ttracy/Documents/GNURADIO/examples/companion/top_block.py",
> line 41, in __init__
>     self.connect((self.gr_sig_source_x_0, 0), (self.extras_blob_to_socket_0, 
> 0))
>   File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py",
> line 124, in connect
>     self._connect(points[i-1], points[i])
>   File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py",
> line 130, in _connect
>     dst_block.to_basic_block(), dst_port)
>   File 
> "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gnuradio_core_runtime.py",
> line 1836, in primitive_connect
> Traceback (most recent call last):
>   File "/home/ttracy/Documents/GNURADIO/examples/companion/top_block.py",
> line 54, in <module>
>     return _gnuradio_core_runtime.gr_top_block_sptr_primitive_connect(self,
> *args)
> ValueError: itemsize mismatch: sig_source_f(1):0 using 4, blob_to_udp
> wrapper(6):0 using 1
> 
> Unfortunately, I have no idea what this stack trace is telling me. Can
> it not handle Floats as an input?
> 
> Thanks for the help!
>