問題描述

我正在用 boost TCP 編寫一個客戶端/服務器程序，其中我想每 2 秒向客戶端發送一次 HEARTBEAT 消息，我正在嘗試創建一個新線程，通過它我可以輕松地發送它但無法解決它.我正在使用 boost::thread t(hearbeatSender,sock); 創建線程.但給出了很多錯誤.我也使用 bind 將函數名與套接字綁定，但沒有解決錯誤.

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;
        }
    }
}

這是一個服務端代碼，用于響應客戶端的消息并向客戶端發送心跳.這是一個同步 TCP 服務器.

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.

推薦答案

代替這個:

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();
}

還包括頭文件:

#include <thread>
#include <chrono>

(可選)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傳遞給線程的問題解決了.

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

現在，用于在客戶端和服務器之間進行 HEARTBEAT 對話.可以從這里檢查完整的代碼:

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

客戶端代碼 HEARTBEAT 每 5 次傳輸秒

服務器代碼，用于響應客戶

這篇關于如何將 boost asio tcp 套接字傳遞給線程以將心跳發送到客戶端或服務器的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！