C使用zeromq完成有意义的通讯

本文尝试使用zeromq完成一项简单的网络传送任务。

（小白使用开源共享库（C使用zeromq）该篇已经完成了一个简单的可运行的基本程序，本篇基于此改造而来）

main.c修改后的内容如下：

#include "zhelpers.h"

int main (void)
{
    void *context = zmq_init (1);

   //  Socket to talk to clients
    void *responder = zmq_socket (context, ZMQ_REP);
    zmq_bind(responder, "tcp://*:5559");

    while (1) {
        //  Wait for next request from client
        char *string = s_recv (responder);
        printf ("Received request: [%s]\n", string);
        free (string);

        //  Do some 'work'
        sleep (1);

        //  Send reply back to client
        s_send (responder, "World");
    }
    //  We never get here but clean up anyhow
    zmq_close(responder);
    zmq_term(context);
    return 0;
}

当然我们还需要一个client.c来充当客户端，main.c同级目录下新建client.c。相同的道理，把client的编译信息也加进Makefile

//
//  Hello World client
//  Connects REQ socket to tcp://localhost:5559
//  Sends "Hello" to server, expects "World" back
//
#include "zhelpers.h"

int main (void)
{
    void *context = zmq_init (1);

    //  Socket to talk to server
    void *requester = zmq_socket (context, ZMQ_REQ);
    zmq_connect (requester, "tcp://localhost:5559");

    int request_nbr;
    for (request_nbr = 0; request_nbr != 10; request_nbr++) {
        s_send (requester, "Hello");
        char *string = s_recv (requester);
        printf ("Received reply %d [%s]\n", request_nbr, string);
        free (string);
    }
    zmq_close (requester);
    zmq_term (context);
    return 0;
}