Your line is actually getting the size of the pointer to the data, not the size
of the data. That will always be 4 bytes (in your case) as that’s how big a
pointer is. On a 64 bit system it will always be 8 bytes.
sizeof void* is what your size calculation line is doing. (zmq_msg_data()
returns a void*)
On Sep 16, 2014, at 10:19 AM, Riskybiz <riskybizl...@live.com> wrote:
> Apologies, I should have included the line I had used to determine the size
> of the identity:
>
> "size_t id_size = (sizeof zmq_msg_data(&messageIn));//size in bytes"
>
> I think this is the size of the data payload of the zmq_msg_t object, but
> perhaps it is the size of the pointer returned from
> zmq_msg_data(&messageIn)?
>
> Whereas your line is:
>
> "printf("identity frame size: %ld bytes\n", zmq_msg_size(&messageIn));"
>
> When run on my system I concur that your line gives output of "5 bytes".
>
> router: Preparing
> router: Ready to receive
> identity frame size: 5 bytes
> --------------------------- Message Received ---------------------------
> Originator Identity: 32768 Identity Message Data Payload: 4bytes or 32bits
> Frame Vector Index: 0 Frame Data: Frame1
> Frame Vector Index: 1 Frame Data: Frame2
> Frame Vector Index: 2 Frame Data: Frame3
> Frame Vector Index: 3 Frame Data: Frame4
> Frame Vector Index: 4 Frame Data: Frame5
> ------------------------------------------------------------------------
> MultiPartMessage: Sending to connection identity: 32768 Size of identity:
> 4bytes
> or: 32bits
> router: Ready to receive
>
> Though I'm not sure how to use this information to make the example function
> as intended.
>
> I also tried added a blank message frame after the identity frame as
> suggested by Rodrigo Mosconi, but that did not fix the problem. I was
> working under the impression that any sequence of zmq_msg_t objects could be
> sent via a ROUTER socket so long as the identity of the destination was the
> first frame? Also that the 'blank' frame was necessary for certain socket
> types only e.g. REQ-REP?
>
> Thanks,
>
> Riskybiz.
>
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