Re: [Discuss-gnuradio] Suppressing UHD prints

[Koslowski, Sebastian (CEL)]

On 07/01/2015 10:19 AM, Piotr Krysik wrote:

Hi all,

UHD host library generates prints on the stdout. For example on each
retune I get something like:

-- Tune Request: 959.000000 MHz
--   The RF LO does not support the requested frequency:
--     Requested LO Frequency: 959.000000 MHz
--     RF LO Result: 958.998779 MHz
--   Attempted to use the DSP to reach the requested frequency:
--     Desired DSP Frequency: -0.001221 MHz
--     DSP Result: -0.001221 MHz
--   Successfully tuned to 959.000000 MHz

These prints are sometimes cluttering the console - especially when
someone wants to use console to print other useful information.

There is possibility to disable them in UHD from the level of C++:
http://files.ettus.com/manual/page_general.html
("Disabling or redirecting prints to stdout")

Is it possible to disable the prints from GNU Radio?

I had looked into that some time ago. In the current form it is not possible.

Even if ' uhd::msg::register_handler' would be exposed to python, you still can't drop-in your own null-handler. Swig doesn't support callbacks in the target language (python). However, you can add custom handlers like a null_handler in C++ and then use that. Try the attached patch. Works for me.  Only output left is that standard version_string.

Sebastian

0001-uhd-add-null-msg-handler-and-expose-to-python.patch
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