AMQP-CPP > 处理程序中的错误文件描述符

Question

I am trying to use AMQP-CPP library for messaging, however I can not make it work. I want to use already built classes from the library for channel, connection, handler. I started with their examples but every time running the code I get Bad file descriptor error and process ends. My code looks like this

#include <amqpcpp.h>
#include <amqpcpp/libboostasio.h>
#include <boost/asio/io_service.hpp>
#include <boost/asio/strand.hpp>
#include <boost/asio/deadline_timer.hpp>

class MyHandler : public AMQP::LibBoostAsioHandler
{
public:
    MyHandler(boost::asio::io_service& service)
        : AMQP::LibBoostAsioHandler(service)
    {
    }

    virtual void onError(AMQP::TcpConnection *connection, const char *message) override
    {
        std::cout << "MyHandler::onError " << message << std::endl;
    }
};

int main()
{
    // access to the event loop
    boost::asio::io_service service(2);

    // handler for libevent
    MyHandler handler(service);

    // make a connection
    AMQP::TcpConnection connection(&handler, AMQP::Address("amqp://localhost/"));

    // we need a channel too
    AMQP::TcpChannel channel(&connection);

    channel.onError([](const char *message) {
        // report error
        std::cout << "channel error: " << message << std::endl;
    });
    channel.onReady([]() {
        // send the first instructions (like publishing messages)
        std::cout << "channel onReady: " << std::endl;
    });

    // create a temporary queue
    channel.declareQueue("aaa").onSuccess([&connection](const std::string& name, uint32_t messagecount, uint32_t consumercount) {

        // report the name of the temporary queue
        std::cout << "declared queue " << name << std::endl;

        // now we can close the connection
        connection.close();
    });  

    auto startCb = [](const std::string &consumertag) {
        std::cout << "consume operation started" << std::endl;
    };

    // callback function that is called when the consume operation failed
    auto errorCb = [](const char *message) {
        std::cout << "consume operation failed" << std::endl;
    };

    // callback operation when a message was received
    auto messageCb = [&channel](const AMQP::Message &message, uint64_t deliveryTag, bool redelivered) {
        std::cout << "message received" << std::endl;
        // acknowledge the message
        channel.ack(deliveryTag);
    };

    channel.consume("aaa").onReceived(messageCb)
    .onSuccess(startCb)
    .onError(errorCb);

    // run the loop
    service.run();

    return 0;
}

Output:

MyHandler::onError Bad file descriptor

Also, error occurs on the line service.run();

I have also tried a similar thing with libevent .

What's wrong here and how to fix? Any ideas?

Answer 1

Actually it turned out that there are two issues.

Firstly, libev should be used, because that's the oficial supported one. Secondly, make sure that your RabbitMQ server is running. More detailed information you can find here .