[zeromq-dev] Dipping into zmq_recv from czmq

Brian Sellden brian_ls2 at comcast.net
Wed May 3 21:29:00 CEST 2017

Hi Aaron – This worked perfectly.  Thank you.


From: zeromq-dev [mailto:zeromq-dev-bounces at lists.zeromq.org] On Behalf Of Aaron Sokoloski
Sent: Wednesday, May 03, 2017 12:06 PM
To: ZeroMQ development list
Subject: Re: [zeromq-dev] Dipping into zmq_recv from czmq


Hi Brian,

I'm far from an expert on this, but it looks like the zsock_resolve method will return the underlying zmq_socket, and then you can do what you want with it.

Someone else may be able to chip in with a more idiomatic solution to your problem, though.





On 3 May 2017 at 10:53, Brian Sellden <brian_ls2 at comcast.net> wrote:



I’m using czmq to transfer serialized objects in char arrays.  The serialized data may contain nulls, so processing with c-string oriented functions Is a problem.  So using zstr_recv(void*) doesn’t work for me as it returns a char* with no way to identify the length of the array.


I thought I might dip into the zmq calls directly so I can use zmq_recv(void* source, void* buf, size_t len, int flags), as it returns the number of bytes copied into the buffer.  But my sockets are created with zsock_new(…), so I’m not sure about the compatibility of these calls.  Am I on the right track with this, and can someone offer some advice on how to proceed?  I did try just putting my zsock_t* into the zmq_recv call, but it just returns -1 even though zpoller_t reports that there is data available on the socket.


Thanks –



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