Re: [Discuss-gnuradio] Question about the "ninput_items"

Hi Zswx,

ninput_items[0] is really the number of items that you can consume in a work call (on input stream 0). It's usually > 1.

Best regards,
Marcus

On 07/09/2015 03:29 PM, zs wrote:

Hi,

    Thank you in advance.I have a question about the "ninput_items".I find the meaning of it is "vector of items available on all input buffers".

    When I read the source code of "crc32_bb_impl.cc",I see the code below,

"

int

 65     crc32_bb_impl::work (int noutput_items,

 66                        gr_vector_int &ninput_items,

 67                        gr_vector_const_void_star &input_items,

 68                        gr_vector_void_star &output_items)

 69     {

 70       const unsigned char *in = (const unsigned char *) input_items[0];

 71       unsigned char *out = (unsigned char *) output_items[0];

 72       long packet_length = ninput_items[0];

"

I think the ninput_items[0]=1,because the item input is 1 every times.But when I write the code "std::cout<<ninput_items[0]<<std::endl;",It display the packet_length.I think the ninput_items[0]=1 no matter what pack_length is.Why I'm wrong?

Thank you.

Best regards,

zswx

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