Re: [Discuss-gnuradio] question about set_output_multiple

[Marcus Müller]

Hello David,

Problem 1:

your "error: expected..." looks like there's something small wrong with
your C++ syntax; would you mind sharing the code of your constructor (or
at least the signature and the lines containing set_output_multiple)?
Generally, "int tamano" declares the variable tamano as integere -- I
think you might be fine if you just delete the "int".

Problem 2:
SWIG can be hard. But usually, if you created the stub for your block
using "gr_modtool add", then everything will be alright, and all the
methods defined in include/your_block_name.h will be available to
python, as long as they are easily wrappable (this mostly means that you
used basic parameter types only).

Best regards,
Marcus

On 06/15/2015 04:51 AM, dcardona wrote:
> Hello
>
> I'm trying to create a block whose number of outputs is the number of
> inputs, which i'm setting as a parameter of the block(named tamano),+ n,
> being n a parameter of the block too.
> For example, if i use a vector sources block of size 16 as the input of my
> block, and n = 3, the output should be of size 19.
> According to what i have read, i should use the set_output_multiple() to
> achieve this.
>
> Problem 1:
> But i don't know what is the correct way to do this, or where to set it.
> I was doing it by writing: set_output_multiple(int tamano + n) at the
> constructor, but i'm having an error: error: expected primary-expression
> before ‘int’.
>
> Problem 2:
> I am trying to create this block with a c++ code and i don't know how to use
> SWIG, i don't know if i should convert the c++ code into a python code using
> SWIG and then copy it into the .cpp file generated, or if i copy the c++
> code into it and then SWIG converts it to a python code using some commands
> in the terminal.
>
> Could the problem 1 has something to do with the fact that I am trying to
> create this block with a c++ code?
>
> Thank you very much.
>
> David.
>
>
>
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