Re: [Discuss-gnuradio] Adding functionality to a GRC-generated flowgraph

[Josh Blum]

Not entirely sure what you talking about, but you can add a custom block 
wrapper for basically anything. It doesnt have to be a real gr block. 
Make a custom block wrapper without any inputs or outputs, and put your 
special code in the <make>blah</make> that instantiates your object.

A good example is the xmlrpc server: 
http://gnuradio.org/trac/browser/gnuradio/trunk/grc/data/platforms/python/blocks/xmlrpc_server.xml
Its not a signal processing block, but it will start an xmlrpc server 
and a thread inside your flow graph.

If your code is more complicated than that, you can encapsulate anything 
into a python module, install it into the python path, and instantiate 
it using the block wrapper <make>.

-josh

Marcus D. Leech wrote:
> Josh, etc al:
>
> What is the best way to "tack on" functionality to a GRC-generated
> flowgraph--that is, things that are outside of
>   the Gnu Radio "environment" but still important to your application.
>
> I'd like to add things like a timeout function that "does things" from
> time to time, as well as other important tasks, initializations,
>   etc.