Hi:
Thank you so much.
For example,I write a simple c++ program which can use the
"gnuradio/fft/fft.h".But i also want to use
<gnuradio/digital/ofdm_cyclic_prefixer.h>.
But the ofdm_cyclic_prefixer is a block.It has work function.
I attached my document.
#include <fstream>
#include <vector>
#include <gnuradio/gr_complex.h>
#include <gnuradio/fft/fft.h>
#include <gnuradio/digital/ofdm_cyclic_prefixer.h>
std::vector<std::complex<float> *> buff1(64);//read data
std::vector<std::complex<float> *> buff2(64);//write data
std::ifstream infile("a.dat",std::ifstream::binary);
std::ofstream outfile("b.dat",std::ofstream::binary);
int main(){
while(not infile.eof())
{
infile.read((char*)&buff1.front(),buff1.size()*sizeof(std::complex<float>));
gr::fft::fft_complex *buff=new gr::fft::fft_complex(64,0);
gr_complex *bu=buff->get_inbuf();
memcpy(bu,&buff1.front(),buff1.size()*sizeof(std::complex<float>));
buff->execute();
gr_complex *out=buff->get_outbuf();
memcpy(&buff2.front(),out,buff2.size()*sizeof(std::complex<float>));
outfile.write((char*)&buff2.front(),buff2.size()*sizeof(std::complex<float>));
}
infile.close();
outfile.close();
}
Can you help me?
Thanks
Best regards,
xianda
At 2014-05-31 05:56:29, "Marcus Müller" <marcus.muel...@ettus.com> wrote:
Hi Xianda,
I know every block should have it's work or general_work function.And
i know it's used by scheduler.
Right!
Now I want to write my c++ code just call work function.Is right to do
it?
I hope I understand you correctly:
You want to write a C++ program that calls your work function?
As usual, it would be quite helpful if you explained *why* you would want to do
this!
Short Answer:
*Usually* you don't do that, so it's not right to do.
Long Answer:
You can not generally do this because a block can only exist within GNU Radio,
and relies on GNU Radio scheduler mechanisms.
If you however, wrote a work() that only uses the the input_items, output_items
buffers and only relies on noutput_items as runtime information,
than that's technically possible. I would *not* recommend that, though. Better
write a new function, e.g. "signal_processing(in,out, howmany)" in a non-block
class
and call that from your work() as well as from your new C++ program.
If ok,can someone explain how to call work function?
It's a C++ method, and the function signature is
int work (int noutput_items, gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
(from the official documentation,
http://gnuradio.org/doc/doxygen/classgr_1_1sync__block.html)
You could call it like you would call every other method. Since I assume you
already know how input_ and output_items should look like from writing a work()
function,
I don't understand where the "how to call question" comes from.
Best Regards,
Marcus Müller
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