Understanding c++ code

GNU Radio
1

I installed GNU RADIO from this link
http://blogs.bu.edu/mhirsch/2012/07/installing-gnu-radio-in-ubuntu-12-04-x64/comment-page-1/
I want to test some blocks & see their output to understand them more
and
more.
for example I opened additive_scrambler_bb c++ codes in terminal to
understand but I want to see how some parameters change in code when
running it .
how to output these parameters in terminal ? Can I write in code “cout”
like any c++code?
And do I have to build gnuradio again even if I will erase all my
modifications in code (I don’t want these modifications permanently I
want
only to output all parameters to understand the block)

I did the following:
editing it using vim ./additive_scrambler_bb_impl.cc
running it to see the output on terminal using
./additive_scrambler_bb_impl.cc

but when I ran it in terminal I got this message:
bash: ./additive_scrambler_bb_impl.cc: Permission denied

Thanks

2

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Hi Sara,

C++ is a compiled language; you can not execute a source code file.
You have to recompile the file by rebuilding GNU Radio.
additive_scrambler_bb_impl.cc contains the implementation of the
additive_scrambler_bb block, it is not itself executable.
You need to have a flowgraph containing that block to test your
modified version.

I think you should start with a basic C++ tutorial before you try to
understand and modify GNU Radio’s C++ codebase – these are very basic
concepts you are missing.

Greetings,
Marcus

On 12.04.2014 16:18, Sara C. wrote:

I installed GNU RADIO from this link

http://blogs.bu.edu/mhirsch/2012/07/installing-gnu-radio-in-ubuntu-12-04-x64/comment-page-1/

I want to test some blocks & see their output to understand them more
and

terminal using ./additive_scrambler_bb_impl.cc
Discuss-gnuradio Info Page

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3

How to rebuild gnuradio after I changed in c++ codes ?
Note:
I installed GNU RADIO from this link
http://blogs.bu.edu/mhirsch/2012/07/installing-gnu-radio-in-ubuntu-12-04-x64/comment-page-1/

2014-04-12 17:17 GMT+02:00 Marcus M. [email protected]:

4

how I can re-build digital library only after making changes in c++ code
of
a block… not re-building the whole gnuradio

I installed GNU RADIO from this link
http://blogs.bu.edu/mhirsch/2012/07/installing-gnu-radio-in-ubuntu-12-04-x64/comment-page-1/

2014-04-13 0:55 GMT+02:00 Sara C. [email protected]:

5

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Hi Sara,

You have to have a full source tree lying around, where you modify the
code.
Then you follow the official wiki’s guide on how to build from source:
http://gnuradio.org/redmine/projects/gnuradio/wiki/BuildGuide

Greetings,
Marcus

PS: I’ve mentioned that already, but let me say this once again:
gnuradio.org is the only source of information that’s not likely to
outdate.

On 13.04.2014 01:02, Sara C. wrote:

How to rebuild gnuradio after I changed in c++ codes ? Note: I
installed GNU RADIO from this link

http://blogs.bu.edu/mhirsch/2012/07/installing-gnu-radio-in-ubuntu-12-04-x64/comment-page-1/

2014-04-12 17:17 GMT+02:00 Marcus M. [email protected]:

You need to have a flowgraph containing that block to test

http://blogs.bu.edu/mhirsch/2012/07/installing-gnu-radio-in-ubuntu-12-04-x64/comment-page-1/

I want to test some blocks & see their output to understand them more
and

./additive_scrambler_bb_impl.cc running it to see the output
on terminal using ./additive_scrambler_bb_impl.cc

but when I ran it in terminal I got this message: bash:
./additive_scrambler_bb_impl.cc: Permission denied

Thanks
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