I have looked at the self test and did not see an example where frames were
being written and a picture received. Here is what happens when I run the code
below. As you can see, only the string comes through when sending frames to a
picture.
Testing picture to picture send/receive:
Sending 5, topic, 3
Received 5, topic, 3
Testing frame to picture send/receive:
Received 0, topic, 0
#include "czmq.h"
#include <iostream>
int main(void) {
// Create two PAIR sockets and connect over inproc
zsock_t *output = zsock_new_pair("@inproc://zsock.test");
assert (output);
zsock_t *input = zsock_new_pair(">inproc://zsock.test");
assert (input);
// picture to picture test
std::cout << "Testing picture to picture send/receive:\n";
int num1 = 5;
uint32_t num2 = 3;
std::cout << "Sending " << num1 << ", topic, " << num2 << std::endl;
zsock_send(output, "is4", num1, "topic", num2);
int rnum1;
char *rstr;
uint32_t rnum2;
int rc = zsock_recv(input, "is4", &rnum1, &rstr, &num2);
assert(rc == 0);
std::cout << "Received " << rnum1 << ", " << rstr << ", " << num2 <<
std::endl;
freen(rstr);
// frames to picture test
std::cout << "Testing frame to picture send/receive:\n";
zmsg_t *msg = zmsg_new();
assert(msg);
rc = zmsg_addmem(msg, &num1, sizeof(num1));
assert(rc == 0);
rc = zmsg_addmem(msg, "topic", 5);
assert(rc == 0);
rc = zmsg_addmem(msg, &num2, sizeof(num2));
assert(rc == 0);
rc = zmsg_send(&msg, output);
assert(rc == 0);
rnum1 = 0;
rnum2 = 0;
rc = zsock_recv(input, "is4", &rnum1, &rstr, &num2);
assert(rc == 0);
std::cout << "Received " << rnum1 << ", " << rstr << ", " << num2 <<
std::endl;
freen(rstr);
zsock_destroy(&input);
zsock_destroy(&output);
}
Thanks,
Joe
Message: 13
Date: Sat, 24 Mar 2018 10:11:02 +0000
From: Luca Boccassi <[email protected]>
To: ZeroMQ development list <[email protected]>
Subject: Re: [zeromq-dev] zframe compatible w/zsock picture?
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
On Fri, 2018-03-23 at 22:25 +0000, Georger, Joseph wrote:
> Just a quick question, I was starting to write send & receive using
> zframes, but came across the ?picture? concept in zsock. I was
> sending three zframes, using addmem to construct the zmsg: char *
> topic, uint32_t length in bytes, char * for msg.
>
> I wrote the receiver using pictures,
> zsock_receive(socket, ?s4s?, &sz, &topic, &payload)
>
> topic came through, but sz was 0. Should this in theory work, can I
> receive a frame containing a uint32_t with the picture paradigm? Can
> I intermix a zmsg/zframe sender with a picture receiver (and vice
> versa)? The docs imply yes: ?The picture is a string that defines the
> type of each frame.?
>
> Thanks,
> Joe
Yes, see selftest for an example:
https://github.com/zeromq/czmq#zsock---high-level-socket-api-that-hides-libzmq-contexts-and-sockets
--
Kind regards,
Luca Boccassi
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