Re: [Discuss-gnuradio] How to add code to a gnuradio_companion variable setter

[Marcus Müller]

Hi kai,

short version:

1. make an out-of-tree module
2. add new block – python or cpp, doesn't matter, should be of type 
"noblock" if you really just want to do anything.
3. modify the XML file describing that block for the GNU Radio 
Companion, so that it has a parameter with a 
<callback>methodname($parametername)</callback> field.
4. do what you want in yourblock.methodname(parameter)
5. build and install that module

You'll find an intro on how to use gr_modtool to generate out-of-tree 
modules in the "Guided Tutorials" on http://tutorials.gnuradio.org .

BUT: I **Really** would discourage trying to do what you're doing. Use 
message passing instead. What is it that you want to build? I'm almost 
certain what you're trying to achieve can be done in different, less 
"complicated" manners.

Best regards,
Marcus

PS: we say "GRC" or "GNU Radio companion", because it's the "graphical 
companion to GNU Radio"; "gnu radio_companion" just seems wrong :)


On 08/14/2017 10:07 PM, Kai Garrels wrote:
> Hi,
>
> I would like to add some code to a variable setter, whenever set_var... is 
> called, that code shall be executed after setting the variable
>
> How could I achieve this in gnu radio_companion?
>
> Best regards,
> kai
>
>
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