问题描述

我正在用 boost TCP 编写一个客户端/服务器程序，其中我想每 2 秒向客户端发送一次 HEARTBEAT 消息，我正在尝试创建一个新线程，通过它我可以轻松地发送它但无法解决它.我正在使用 boost::thread t(hearbeatSender,sock); 创建线程.但给出了很多错误.我也使用 bind 将函数名与套接字绑定，但没有解决错误.

I am writing a client/server program in boost TCP in which I want to send a HEARTBEAT message to the client every 2 seconds for which I am trying to create a new thread by which I can send it easily but unable to solve it. I am creating thread using boost::thread t(hearbeatSender,sock); this. but giving lots of errors. I also use bind to bind function name with the socket but not resolved the error.

void process(boost::asio::ip::tcp::socket & sock);
std::string read_data(boost::asio::ip::tcp::socket & sock);
void write_data(boost::asio::ip::tcp::socket & sock,std::string);
void hearbeatSender(boost::asio::ip::tcp::socket & sock);
int main()
{

    unsigned short port_num = 3333;
    boost::asio::ip::tcp::endpoint ep(boost::asio::ip::address_v4::any(), port_num);
    boost::asio::io_service io;
    try
    {
        boost::asio::ip::tcp::acceptor acceptor(io, ep.protocol());
        acceptor.bind(ep);
        acceptor.listen();
        boost::asio::ip::tcp::socket sock(io);
        acceptor.accept(sock);
        boost::thread t(hearbeatSender,sock); 
        process(sock);
        t.join();

    }
    catch (boost::system::system_error &e)
    {
        std::cout << "Error occured! Error code = " << e.code()
        << ". Message: " << e.what();

        return e.code().value();
    }
  return 0;

}
void process(boost::asio::ip::tcp::socket & sock)
{
    while(1){
    std::string data = read_data(sock);
    std::cout<<"Client's request is: "<<data<<std::endl;
    write_data(sock,data);
    }
}
std::string read_data(boost::asio::ip::tcp::socket & sock)
{
    boost::asio::streambuf buf;
    boost::asio::read_until(sock, buf, "
");
    std::string data = boost::asio::buffer_cast<const char*>(buf.data());
    return data;
}
void write_data(boost::asio::ip::tcp::socket & sock,std::string data)
{
    boost::system::error_code error;
    std::string msg;
    int ch = data[0]-'0';
    switch(ch)
    {
        case 1: msg = "Case 1
"; break;
        case 2: msg = "Case 2
"; break;
        case 3: msg = "Case 3
"; break;
        case 4: msg = "Case 4
"; break;
        default: msg  = "Case default
"; break;
    }
    boost::asio::write( sock, boost::asio::buffer(msg+ "
"), error );
     if( !error ) {
        std::cout << "Server sent hello message!" << std::endl;
     }
     else {
        std::cout << "send failed: " << error.message() << std::endl;
     }
}
void hearbeatSender(boost::asio::ip::tcp::socket & sock)
{
    boost::system::error_code error;
    std::string msg = "HEARTBEAT";
    while(1)
    {
        sleep(2);
        std::cout<<msg<<std::endl;
        boost::asio::write( sock, boost::asio::buffer(msg+ "
"), error );
        if( !error ) {
        std::cout << "Server sent HEARTBEAT message!" << std::endl;
        }
        else {
            std::cout << "send failed: " << error.message() << std::endl;
        }
    }
}

这是一个服务端代码，用于响应客户端的消息并向客户端发送心跳.这是一个同步 TCP 服务器.

This is a server-side code for responding to the message of the client and sending heartbeat to the client. This is a synchronous TCP server.

推荐答案

代替这个:

try
    {
        boost::asio::ip::tcp::acceptor acceptor(io, ep.protocol());
        acceptor.bind(ep);
        acceptor.listen();
        auto sock = acceptor.accept();
        std::thread t([&sock]() {
            hearbeatSender(sock);
        });
        process(sock);
        t.join();

    }

使用它:

try{
        boost::asio::ip::tcp::acceptor acceptor(io, ep.protocol());
        acceptor.bind(ep);
        acceptor.listen();
        boost::asio::ip::tcp::socket sock(io);
        acceptor.accept(sock);

        std::thread t([&sock]() {
            hearbeatSender(sock);
        });
        process(sock);
        t.join();
}

还包括头文件:

#include <thread>
#include <chrono>

(可选)你也可以使用 this_thread::sleep_for 而不是 sleep()std::this_thread::sleep_for(std::chrono::seconds(10));

(Optional) you can also use this_thread::sleep_for instead of sleep() std::this_thread::sleep_for(std::chrono::seconds(10));

把socket传递给线程的问题解决了.

The problem of passing a socket to the thread is solved.

现在，用于在客户端和服务器之间进行 HEARTBEAT 对话.可以从这里检查完整的代码:

Now, for conversing a HEARTBEAT between a client and a server. Complete code can be checked from here:

客户端代码 HEARTBEAT 每 5 次传输秒

服务器代码，用于响应客户

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