zeromq学习记录(七)订阅发布消息封装

之前也有提到 使用订阅发布 pub sub模式必须要显示定义ZMQ_SUBSCRIBE

只有以此模式定义的过滤字节开头的消息才会被订阅者收到

如果想收到所有信息

可定义subscriber.setsockopt(ZMQ_SUBSCRIBE, "", 0); 此类过滤器

示例很简单 我将示例代码发布者与订阅者整合到一个工程中 开启两个线程演示

上代码

// psenvpubsub.cpp : 定义控制台应用程序的入口点。
//
 
#include "stdafx.h"
#include "zhelpers.hpp"
#include <thread>
 
void PubFunc()
{
    zmq::context_t context();
    zmq::socket_t publisher(context, ZMQ_PUB);
    publisher.bind("tcp://*:5563");
 
    while () {
        //  Write two messages, each with an envelope and content
        s_sendmore(publisher, "A");
        s_send(publisher, "We don't want to see this");
        s_sendmore(publisher, "B");
        s_send(publisher, "We would like to see this");
        Sleep();
    }
    return;
}
 
void SubFunc()
{
    zmq::context_t context();
    zmq::socket_t subscriber(context, ZMQ_SUB);
    subscriber.connect("tcp://localhost:5563");
    subscriber.setsockopt(ZMQ_SUBSCRIBE, "B", );
 
    while () {
 
        //  Read envelope with address
        std::string address = s_recv(subscriber);
        //  Read message contents
        std::string contents = s_recv(subscriber);
 
        std::cout << "[" << address << "] " << contents << std::endl;
    }
}
 
int main()
{
    //开启两个线程  一个发 一个收
    // 用于演示发布者的封包发送及订阅者的过滤使用
 
    std::thread threadPub = std::thread(PubFunc);
    std::thread threadSub = std::thread(SubFunc);
 
    threadPub.join();
    threadSub.join();
 
    return ;
}