Question

我正在尝试使用AMQP-CPP库进行消息传递，但是无法使其正常工作。我想将库中已构建的类用于通道，连接，处理程序。我从他们的示例开始，但是每次运行代码时，我都会遇到Bad file descriptor错误，并且过程结束。我的代码看起来像这样

#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;
}

输出：

MyHandler :: onError错误的文件描述符

此外，在行service.run();上发生错误

我也尝试过使用libevent做类似的事情。

这里出了什么问题以及如何解决？有什么想法吗？

Answer 1

实际上，有两个问题。

首先，应使用libev，因为这是官方支持的版本。其次，确保您的RabbitMQ服务器正在运行。您可以找到here的更多详细信息。

AMQP-CPP>处理程序中的错误文件描述符

1 个答案: