使用 ZMQ 和 protobuf 时接收 0 大小的消息 [英] Receiving 0 size messages while using ZMQ and protobuf

问题描述

我正在尝试使用 ZMQ 在客户端和服务器之间建立一个基本的通信系统.我使用 protobuf 作为消息格式.我的问题是当我从客户端发送消息时，消息大小为 34，但服务器上收到的消息大小为 0.

I am trying to set up a basic communication system between client and server using ZMQ. I am using protobuf for the message format. My problem is when I send the message from client the message size is 34 but the message size received on the server is 0.

以下是我的代码；

客户端.cpp

tutorial::Person person;
person.set_id(1234);
person.set_name("john");
person.set_email("[e-mail]");
person.set_phonenumber("12345678");


zmq::context_t context (1); //  Prepare our context and socket
zmq::socket_t socket (context, ZMQ_PAIR);

std::cout << "Connecting to server…" << std::endl;
int linger = 0;// ms
socket.setsockopt(ZMQ_LINGER, &linger, sizeof(linger));
socket.connect ("tcp://127.0.0.1:20000");

std::string msg_str;
person.SerializeToString(&msg_str);
std::cout << "Size of message string is "<< msg_str.size()<<std::endl;
zmq::message_t request (msg_str.size());
memcpy ((void *) request.data (), msg_str.c_str(), msg_str.size());
std::cout << "Sending Person data ..." << std::endl;
socket.send (request);

socket.close();

google::protobuf::ShutdownProtobufLibrary();
return 0;

服务器.cpp:

zmq::context_t context(1); //  Prepare our context and socket
zmq::socket_t socket(context, ZMQ_PAIR);
int linger = 0; // ms
socket.setsockopt(ZMQ_LINGER, &linger, sizeof(linger));
socket.bind("tcp://127.0.0.1:20000");
while (true)
 {
    zmq::message_t request;
    int recieved = socket.recv(&request);
    std::string msg(static_cast<char*>(request.data()),request.size());
    std::cout<<"Size of message recieved is "<<  msg.size()<<std::endl;
    tutorial::Person person;
    person.ParseFromString(msg);
    std::string text_str1;
    google::protobuf::TextFormat::PrintToString(person, &text_str1);
}
socket.close();

客户端的输出是:

Size of message string is 34

服务器的输出是:

Size of message received is 0

我也尝试过切换到 ParseToArray，但没有帮助.任何形式的帮助表示赞赏.

I have tried tried switching to ParseToArray also but it did not help. Any kind of help is appreciated.

推荐答案

我已经用另一种方式解决了.其实之前我安装了 libzmq lib ，但后来当我切换到 libzmq3-dev 时，它对我有用.

I have solved it with another way. Actually earlier I installed libzmq lib , but later when I switched to libzmq3-dev it worked for me.

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