ZeroMQ初步学习

今天先来编译一下ZeroMQ的示例程序。

首先要先安装zeromq，使用默认的选项./configure, make, make install。

然后是zeromq的server的示例代码

 #include <zmq.hpp>
 #include <string>
 #include <iostream>
 #include <unistd.h>

 int main () {
     // Prepare our context and socket
     zmq::context_t context (1);
     zmq::socket_t socket (context, ZMQ_REP);
     socket.bind ("tcp://*:5555");

     while (true) {
         zmq::message_t request;

         // Wait for next request from client
         socket.recv (&request);
         std::cout << "Received Hello" << std::endl;

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

         // Send reply back to client
         zmq::message_t reply (5);
         memcpy ((void *) reply.data (), "World", 5);
         socket.send (reply);
     }
     return 0;
 }

编译：

 g++ -g -Wall -fPIC -I../../include -I../../utils -shared -c server.cpp -o server.o
 cc -L../../lib -g -lstdc++ -lzmq -o server server.o

在编译的时候，如果找不到zmq库，别忘了把安装路径加入到/etc/ld.so.conf中，并执行ldconfig。

下面是client的示例程序

 //
 // Hello World client
 // Connects REQ socket to tcp://localhost:5555
 // Sends "Hello" to server, expects "World" back
 //
 #include <zmq.h>
 #include <string.h>
 #include <stdio.h>
 #include <unistd.h>

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

     // Socket to talk to server
     printf ("Connecting to hello world server…\n");
     void *requester = zmq_socket (context, ZMQ_REQ);
     zmq_connect (requester, "tcp://localhost:5555");

     int request_nbr;
     for (request_nbr = 0; request_nbr != 10; request_nbr++) {
         zmq_msg_t request;
         zmq_msg_init_size (&request, 5);
         memcpy (zmq_msg_data (&request), "Hello", 5);
         printf ("Sending Hello %d…\n", request_nbr);
         zmq_send (requester, &request, 0);
         zmq_msg_close (&request);

         zmq_msg_t reply;
         zmq_msg_init (&reply);
         zmq_recv (requester, &reply, 0);
         printf ("Received World %d\n", request_nbr);
         zmq_msg_close (&reply);
     }
     zmq_close (requester);
     zmq_term (context);
     return 0;
 }

编译：

 g++ -g -Wall -fPIC -I../../include -I../../utils -shared -c client.cpp -o client.o
 cc -L../../lib -g -lstdc++ -lzmq -o client client.o

下面运行一下：

 [xxx@xxx-vm-fc13 client]$ ./client
 Connecting to hello world server…
 Sending Hello 0…
 Received World 0
 Sending Hello 1…
 Received World 1
 Sending Hello 2…
 Received World 2
 Sending Hello 3…
 Received World 3
 Sending Hello 4…
 Received World 4
 Sending Hello 5…
 ^C
 [xxx@xxx-vm-fc13 client]$

 [xxx@xxx-vm-fc13 server]$ ./server
 Received Hello
 Received Hello
 Received Hello
 Received Hello
 Received Hello
 Received Hello
 ^C
 [xxx@xxx-vm-fc13 server]$

虽然使用的是示例程序，但是从代码上看，使用zeromq确实比直接使用socket要简单方便的多。更何况据说还高效。

今天只是简单的试用zeromq，以后就慢慢开始深入了。

参考： http://zguide.zeromq.org/page:all