ZeroMq的编译及使用

ZeroMq是一个开源的消息队列网络框架，支持进程内和进程间的通信。
源码地址：https://github.com/zeromq/libzmq

windows下的编译：
打开build/msvc，打开工程，编译报错，解决方案如下：
1、添加宏
ZMQ_IOTHREAD_POLLER_USE_SELECT
ZMQ_POLL_BASED_ON_SELECT
2、编译成功，链接出错
将src下的文件全部添加到工程src目录下
编译完成。

编程示例：

//1、publish、subscribe模式
void zmq_publish_server()
{
    printf("server start\n");
    zmq_msg_t msg;
    zmq_msg_init(&msg);
    void* context = zmq_ctx_new();
    void* publisher = zmq_socket(context, ZMQ_PUB);
    int rc = zmq_bind(publisher, "tcp://*:8888");
    if (rc != 0)
    {
        printf("bind fail");
        return;
    }
    while (true)
    {
        int zipcode, temperature, relhumidity;
        zipcode = rand() % (100000);
        temperature = rand() % (215) - 80;
        relhumidity = rand() % (50) + 10;
        //  Send message to all subscribers
        char update[65];
        snprintf(update, 64, "%05d %d %d", zipcode, temperature, relhumidity);
        memcpy(zmq_msg_data(&msg), update, strlen(update));
        //int size = zmq_sendmsg(publisher, &msg, 0);
        int size = zmq_send(publisher, update, sizeof(update),0);
        Sleep(2000);
    }
    zmq_close(publisher);
    zmq_ctx_destroy(context);
}

void zmq_subscribe_client()
{
    printf("zmq_client start.\n");
    zmq_msg_t msg;
    zmq_msg_init(&msg);
    void* context = zmq_ctx_new();
    void* subscriber = zmq_socket(context, ZMQ_SUB);
    int rc = zmq_connect(subscriber, "tcp://localhost:8888");
    /*
    ZMQ_SUBSCRIBE：创建消息过滤标志
    ZMQ_SUBSCRIBE属性将会在ZMQ_SUB类型的socekt上创建一个新的消息过滤标志。
    新建立的ZMQ_SUB类型socket会对进入socket的所有消息进行过滤，这样你就可以使用这个属性来建立最初的消息过滤项。
    一个option_value的长度是0的过滤属性会订阅所有的广播消息。一个非空的option_value值会只订阅所有以option_value的值为前缀的消息。
    一个ZMQ_SUB类型的socket可以附加多个过滤条件，只要一个消息符合过滤条件中的任何一个就会被接受。
    */
    zmq_setsockopt(subscriber, ZMQ_SUBSCRIBE, "666", 3);// 只接收消息开头为“666”的消息，必须添加该语句对消息滤波，否则接受不到消息
    while (true)
    {
        int size = zmq_recvmsg(subscriber, &msg, 0);
        if (size == -1)
            continue;
        printf("recv:%s\n", (char*)zmq_msg_data(&msg));
    }
}

//2、push pull模式
void zmq_push_server()
{
    printf("server start\n");
    zmq_msg_t msg;
    zmq_msg_init(&msg);
    void* context = zmq_ctx_new();
    void* publisher = zmq_socket(context, ZMQ_PUSH);
    int rc = zmq_bind(publisher, "tcp://*:8888");
    if (rc != 0)
    {
        printf("bind fail");
        return;
    }
    while (true)
    {
        int zipcode, temperature, relhumidity;
        zipcode = rand() % (100000);
        temperature = rand() % (215) - 80;
        relhumidity = rand() % (50) + 10;
        //  Send message to all subscribers
        char update[65];
        snprintf(update, 64, "%05d %d %d", zipcode, temperature, relhumidity);
        memcpy(zmq_msg_data(&msg), update, strlen(update));
        //int size = zmq_sendmsg(publisher, &msg, 0);
        int size = zmq_send(publisher, update, sizeof(update), 0);
        Sleep(2000);
    }
    zmq_close(publisher);
    zmq_ctx_destroy(context);
}

void zmq_pull_client()
{
    printf("zmq_client start.\n");
    zmq_msg_t msg;
    zmq_msg_init(&msg);
    void* context = zmq_ctx_new();
    void* subscriber = zmq_socket(context, ZMQ_PULL);
    int rc = zmq_connect(subscriber, "tcp://localhost:8888");

    while (true)
    {
        int size = zmq_recvmsg(subscriber, &msg, 0);
        if (size == -1)
            continue;
        printf("recv:%s\n", (char*)zmq_msg_data(&msg));
    }
}

//3、req reply模式
void zmq_reply_server()
{
    printf("server start\n");
    zmq_msg_t msg;
    zmq_msg_init(&msg);
    void* context = zmq_ctx_new();
    void* publisher = zmq_socket(context, ZMQ_REP);
    int rc = zmq_bind(publisher, "tcp://*:8888");
    if (rc != 0)
    {
        printf("bind fail");
        return;
    }
    while (true)
    {
        char buf[255];
        zmq_recv(publisher, buf, 255, 0);
        printf("server recv:%s\n", buf);

        int zipcode, temperature, relhumidity;
        zipcode = rand() % (100000);
        temperature = rand() % (215) - 80;
        relhumidity = rand() % (50) + 10;
        //  Send message to all subscribers
        char update[65];
        snprintf(update, 64, "%05d %d %d", zipcode, temperature, relhumidity);
        memcpy(zmq_msg_data(&msg), update, strlen(update));
        //int size = zmq_sendmsg(publisher, &msg, 0);
        int size = zmq_send(publisher, update, sizeof(update), 0);
        Sleep(2000);
    }
    zmq_close(publisher);
    zmq_ctx_destroy(context);
}

void zmq_req_client()
{
    printf("zmq_client start.\n");
    zmq_msg_t msg;
    zmq_msg_init(&msg);
    void* context = zmq_ctx_new();
    void* subscriber = zmq_socket(context, ZMQ_REQ);
    int rc = zmq_connect(subscriber, "tcp://localhost:8888");

    while (true)
    {
        char buf[255] = "hello server";
        zmq_send(subscriber, buf, strlen(buf) + 1, 0);

        int size = zmq_recvmsg(subscriber, &msg, 0);
        if (size == -1)
            continue;
        printf("client recv:%s\n", (char*)zmq_msg_data(&msg));
    }
}