Re: Are there firls and kaiser filter methods for C++ OOT?

[Marcin Puchlik]

Hi Vasil,

You are right, it helped thank you. 

One more question, do you know why the command: g++ main.cpp -lgnuradio-filter works correctly but in different order: g++ -lgnuradio-filter main.cpp crashes? 

wt., 22 lut 2022 o 14:19 Vasil Velichkov <vvvelichkov@gmail.com> napisał(a):

Hi Marcin,

On 22/02/2022 14.32, Marcin Puchlik wrote:
> But I am not creating the OOT module, I want to get filter taps using
> *low_pass()*  function in simple C++ program (Hello World).

It does not really matter what you are building, if you want to use this function then you need to link this library.
> I even ran this from cmd with the command: *g++
> -I/usr/include/gnuradio/filter -L/usr/lib/x86_64-linux-gnu/ main.cpp *

You need to add -lgnuradio-filter parameter

  g++ -I/usr/include/gnuradio/filter -L/usr/lib/x86_64-linux-gnu/ -lgnuradio-filter main.cpp

Cheers,
Vasil


> and the error is:
>
>
>
> */bin/ld: /tmp/ccTlKCri.o: in function `main':main.cpp:(.text+0xc7):
> undefined reference to `gr::filter::firdes::low_pass_2(double, double,
> double, double, double, gr::fft::window::win_type, double)'collect2: error:
> ld returned 1 exit status*
>
>
>
> wt., 22 lut 2022 o 13:22 Vasil Velichkov <vvvelichkov@gmail.com> napisał(a):
>
>> Hi Marcin,
>>
>> On 22/02/2022 13.09, Marcin Puchlik via GNU Radio, the Free & Open-Source
>> Toolkit for Software Radio wrote:
>>> I also tried to use *low_pass() *function in my C++ program but with no
>>> luck. My linker shouts that there is undefined reference to this function
>>> but headers where recognized.
>>
>> You need to link your OOT module to gnuradio-filter library - in
>> lib/CMakeLists.txt in target_link_libraries() add gnuradio-filter.
>>
>>     target_link_libraries(gnuradio-test gnuradio::gnuradio-runtime
>> gnuradio-filter)
>>
>> Regards,
>> Vasil
>>
>