Re: [Discuss-gnuradio] Question about inputs and outputs of a block

[address@hidden]

>----Messaggio originale----
>Da: address@hidden
>Data: 25-feb-2010 15.57
>A: "address@hidden"<address@hidden>
>Cc: <address@hidden>
>Ogg: Re: [Discuss-gnuradio] Question about inputs and outputs of a block
>
>On Thu, Feb 25, 2010 at 9:26 AM, address@hidden
><address@hidden> wrote:
>> Hi all,
>>
>> I'd like to know if it's possible to create a block with two inputs (or two
>> outputs) having different sizes.
>> For example, a block that takes a vector of N numbers on one of its two 
inputs
>> and a stream (a vector which has only one element) on the other input.
>> I already tried to create a block with these characteristics, but I failed.
>> Please tell me if this is possible.
>>
>> Best Regards,
>>
>> Elettra.
>
>Yes, this is possible (in C++ blocks). You will make the IO signature
>using "gr_make_io_signature2", which takes the standard (min inputs,
>max inputs) as the first two arguments and the next two arguments are
>the item sizes for the different inputs/outputs. You can also use
>"gr_make_io_signature3" or "gr_make_io_signaturev", which takes a
>vector for the signature to have different stream sizes for any number
>of ports.
>
>We used this extensively in the OFDM code. For example, in
>gr_ofdm_sampler, on the input, we take in a stream of complex values
>on input 0 and a stream of characters (that act as flags) on input 1.
>The IO signature looks like:
>
>gr_make_io_signature2 (2, 2, sizeof (gr_complex), sizeof(char))
>
>
>Tom
>

Thank you Tom, but probably I have not expressed correctly. 
I'd like to create a block that takes as first input  a vector of N float and 
as second input  only one float.
Is it possible?

Elettra