Forum: GNU Radio saving a complex data into a file

Hi Community,

I'm trying to save complex data from a block into a file, in order to
process the information later on. My code is very simple, as shown 
bellow:

//Definition of values
std::vector<float> complex_values(4);

complex_values[0]=(-0.707,-0.707);
complex_values[1]=(0.707,-0.707);
complex_values[2]=(-0.707,0.707);
omplex_values[3]=(0.707,0.707);

myfile.open ("/home/usrpvm/Desktop/examples/binary_complex");

myfile <<(char*)&complex_values[0];
myfile <<(char*)&complex_values[1];
myfile <<(char*)&complex_values[2];
myfile <<(char*)&complex_values[3];

When I finish, I check my values with hexdump command:

hexdump binary_complex -v -e ' 2/4 "%10f "' -e '"\n"'
 -0.707000  -0.707000
  0.707000   0.707000
 -0.707000   0.707000
  0.707000   0.707000
  0.707000   0.707000

As you can see, there are more values that I'm saving and there are some
values missing. I think I am doing something wrong when I save the 
values.

Anyone can point me to the right direction?

Thanks for your time,

Jose.

On 10/30/2012 03:24 AM, Jose Torres Diaz wrote:
> complex_values[2]=(-0.707,0.707);
> omplex_values[3]=(0.707,0.707);
>
> myfile.open ("/home/usrpvm/Desktop/examples/binary_complex");
>
> myfile <<(char*)&complex_values[0];
> myfile <<(char*)&complex_values[1];
> myfile <<(char*)&complex_values[2];
> myfile <<(char*)&complex_values[3];

You are casting it into a char * that isnt null terminated.

> As you can see, there are more values that I'm saving and there are some
> values missing. I think I am doing something wrong when I save the values.
>
> Anyone can point me to the right direction?
>
> Thanks for your time,
>
> Jose.


take a look at uhd/host/examples/rx_samples_to_file.cpp
http://code.ettus.com/redmine/ettus/projects/uhd/r...

-josh

Hi Josh,

Thanks for your answer, I followed the provided example and it's working 
correctly.

Cheers,

Sent from my iPhone