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Re: [Discuss-gnuradio] Topology error


From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Topology error
Date: Wed, 30 Jul 2003 00:00:28 -0700
User-agent: Mutt/1.4i

On Tue, Jul 29, 2003 at 09:38:01PM +0100, Matthew Burnham wrote:
> Having bitten the bullet and upgraded to gcc-3.3 and debian testing, I'm 
> now getting somewhere...
> 
> I've got a relatively simple bit of code copied from one of the 
> examples (see below). This compiles fine, but I get the following error: 
> "Topology cannot be changed after inital setup." I'm assuing this is 
> something to do with the way the different Source, Sink and SigProcs are 
> connected together. Do I need to create the various source, sink and 
> SigProcs in a particular order?
> 
> How can I solve this for this simple set-up?
> 
>   VrMultiTask *m = new VrMultiTask ();
>   m->add (scope_sink);
>   m->add (sqr);
>   m->add (scope_sink2);
>   m->start();
> 

You only "add" the sinks.
I think that if you remove the m->add (sqr)  you'll be on your way.

Note however that GrSimpleScopeSink's display is kind of screwed. 
We're fixing this stuff all in python.  Look for a new release
sometime in the next week or two.

Eric






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