# if 0#include 
     
       #include 
      
        #include 
       
         void handler1(const boost::system::error_code &ec) {     std::cout << "5 s." << std::endl; } void handler2(const boost::system::error_code &ec) {     std::cout << "5 s." << std::endl; } boost::asio::io_service io_service; void run() {     io_service.run(); } /*两个线程调用run运行同一个服务，当第一服务在阻塞时，可以再第二个线程里面执行但这样会使得使用std::cout混乱，开线程要注意，开过多的线程是没有意义的*/int main() {     boost::asio::deadline_timer timer1(io_service, boost::posix_time::seconds(5));     timer1.async_wait(handler1);     boost::asio::deadline_timer timer2(io_service, boost::posix_time::seconds(5));     timer2.async_wait(handler2);     boost::thread thread1(run);     boost::thread thread2(run);     thread1.join();     thread2.join(); } #endif#if 0#include 
        
          #include 
         
           #include 
          
            void handler1(const boost::system::error_code &ec) { std::cout << "5 s." << std::endl; } void handler2(const boost::system::error_code &ec) { std::cout << "5 s." << std::endl; } boost::asio::io_service io_service1; boost::asio::io_service io_service2; void run1() { io_service1.run(); } void run2() { io_service2.run(); } /*第二种方法不是多个线程运行同一个服务，而是创建多个服务，每个服务用同一个线程，如果线程数与内核数相同，在一个核上面不回出现竞争现象*/int main() { boost::asio::deadline_timer timer1(io_service1, boost::posix_time::seconds(5)); timer1.async_wait(handler1); boost::asio::deadline_timer timer2(io_service2, boost::posix_time::seconds(5)); timer2.async_wait(handler2); boost::thread thread1(run1); boost::thread thread2(run2); thread1.join(); thread2.join(); } #endif//简单客户端请求#if 0#include 
           
            #include 
            
             #include 
             
              #include 
              
               boost::asio::io_service io_service;boost::asio::ip::tcp::resolver resolver(io_service);boost::asio::ip::tcp::socket sock(io_service);boost::array
               
                 buffer;/** *@brief 读回调，当读完时read_handler内部产生错误，不回循环调用了 */void read_handler(const boost::system::error_code& ec, std::size_t bytes_transferred){ if (!ec) { std::cout << std::string(buffer.data(), bytes_transferred) << std::endl; //必须的，因为可能包没接完，和read_handler交替运行 sock.async_read_some(boost::asio::buffer(buffer), read_handler); }}void connect_handler(const boost::system::error_code& ec){ if (!ec) { //发送http请求， boost::asio::write(sock, boost::asio::buffer("GET / HTTP 1.1\r\nHost: highscore.de\r\n\r\n")); //启动数据的接收,接收数据保存在buffer中，回调read_handler sock.async_read_some(boost::asio::buffer(buffer), read_handler); }}/** *@brief 域名解析回调 *@param it 解析后地址 */void resolver_handler(const boost::system::error_code& ec, boost::asio::ip::tcp::resolver::iterator it){ if (!ec) { //访问IO对象sock，建立连接 sock.async_connect(*it, connect_handler); }}int main(){ boost::asio::ip::tcp::resolver::query query("www.highscore.de", "80");//新建一个查询，域名为...,端口为80 resolver.async_resolve(query, resolver_handler);//解析域名为ip io_service.run();//将控制权交给操作系统进行异步操作 getchar();}#endif//简单的服务器接收例子#if 0#include 
                
                 #include 
                 
                  boost::asio::io_service io_service;//接收端口配置，从80端口等待v4类型的ipboost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), 80);boost::asio::ip::tcp::acceptor acceptor(io_service, endpoint);boost::asio::ip::tcp::socket sock(io_service);std::string data = "HTTP/1.1 200 OK\r\nContent-Length: 13\r\n\r\nHello, world!"; void write_handler(const boost::system::error_code& ec, std::size_t bytes_transferred){}void accept_handler(const boost::system::error_code& ec){ if (!ec) { //async_write_some函数也能发送数据，但这个函数只要发送一个字节就会回调函数， //因为将整个数据发送完毕异步操作才算完毕，async_write函数在发送完毕调用write_handler //这个和libevent机制差不多 boost::asio::async_write(sock, boost::asio::buffer(data), write_handler); }}int main(){ acceptor.listen();//监听，将接收器配置成接收状态 acceptor.async_accept(sock, accept_handler);//等待接收 io_service.run();}#endif