boost ASIO实例
client端代码
#include <iostream> #include <boost/asio.hpp> #include <boost/bind.hpp> #include <boost/shared_ptr.hpp> using boost::asio::ip::tcp; class client { public: client(boost::asio::io_service& io_service,tcp::endpoint& endpoint) : socket(io_service)//这里就把socket实例化了 { //连接服务端 connect socket.async_connect(endpoint, boost::bind(&client::handle_connect,this,boost::asio::placeholders::error) ); memset(getBuffer,'\0',1024); } ~client() {} private: void handle_connect(const boost::system::error_code& error) { if(!error) { //一连上，就向服务端发送信息 boost::asio::async_write(socket,boost::asio::buffer("hello,server!"), boost::bind(&client::handle_write,this,boost::asio::placeholders::error)); /**读取服务端发下来的信息 *这里很奇怪，用async_read根本就不能进入handle_read函数 **/ // --已经解决，boost::asio::async_read(...)读取的字节长度不能大于数据流的长度，否则就会进入 // ioservice.run()线程等待，read后面的就不执行了。 //boost::asio::async_read(socket, // boost::asio::buffer(getBuffer,1024), // boost::bind(&client::handle_read,this,boost::asio::placeholders::error) // ); socket.async_read_some(boost::asio::buffer(getBuffer,1024), boost::bind(&client::handle_read,this,boost::asio::placeholders::error) ); } else { socket.close(); } } void handle_read(const boost::system::error_code& error) { if(!error) { std::cout << getBuffer << std::endl; //boost::asio::async_read(socket, // boost::asio::buffer(getBuffer,1024), // boost::bind(&client::handle_read,this,boost::asio::placeholders::error) // ); //这样就可以实现循环读取了，相当于while（1） //当然，到了这里，做过网络的朋友就应该相当熟悉了，一些逻辑就可以自行扩展了 //想做聊天室的朋友可以用多线程来实现 socket.async_read_some( boost::asio::buffer(getBuffer,1024), boost::bind(&client::handle_read,this,boost::asio::placeholders::error) ); } else { socket.close(); } } void handle_write(const boost::system::error_code& error) { } private: tcp::socket socket; char getBuffer[1024]; }; int main(int argc,char* argv[]) { //if(argc != 3) //{ // std::cerr << “Usage: chat_client <host> <port>\n”; // return 1; //} //我觉IO_SERVICE是一个基本性的接口，基本上通常用到的类实例都需要通过它来构造 //功能我们可以看似socket boost::asio::io_service io_service; //这个终端就是服务器 //它的定义就可以看作时sockaddr_in,我们用它来定义IP和PORT tcp::endpoint endpoint(boost::asio::ip::address_v4::from_string("127.0.0.1"/*argv[1]*/),8100/*argv[2]*/); //既然socket和sockaddr_in已经定义好了，那么，就可以CONNECT了 //之所以为了要把连接和数据处理封成一个类，就是为了方便管理数据,这点在服务端就会有明显的感觉了 boost::shared_ptr<client> client_ptr(new client(io_service,endpoint)); //执行收发数据的函数 io_service.run(); return 0; }
客户端代码
#include <boost/asio.hpp> #include <boost/bind.hpp> #include <boost/shared_ptr.hpp> #include <boost/enable_shared_from_this.hpp> #include <iostream> using boost::asio::ip::tcp; #define max_len 1024 class clientSession :public boost::enable_shared_from_this<clientSession> { public: clientSession(boost::asio::io_service& ioservice) :m_socket(ioservice) { memset(data_,'\0',sizeof(data_)); } ~clientSession() {} tcp::socket& socket() { return m_socket; } void start() { boost::asio::async_write(m_socket, boost::asio::buffer("link successed!"), boost::bind(&clientSession::handle_write,shared_from_this(), boost::asio::placeholders::error)); /*async_read跟客户端一样，还是不能进入handle_read函数,如果你能找到问题所在，请告诉我，谢谢*/ // --已经解决，boost::asio::async_read(...)读取的字节长度不能大于数据流的长度，否则就会进入 // ioservice.run()线程等待，read后面的就不执行了。 //boost::asio::async_read(m_socket,boost::asio::buffer(data_,max_len), // boost::bind(&clientSession::handle_read,shared_from_this(), // boost::asio::placeholders::error)); //max_len可以换成较小的数字，就会发现async_read_some可以连续接收未收完的数据 m_socket.async_read_some(boost::asio::buffer(data_,max_len), boost::bind(&clientSession::handle_read,shared_from_this(), boost::asio::placeholders::error)); } private: void handle_write(const boost::system::error_code& error) { if(error) { m_socket.close(); } } void handle_read(const boost::system::error_code& error) { if(!error) { std::cout << data_ << std::endl; //boost::asio::async_read(m_socket,boost::asio::buffer(data_,max_len), // boost::bind(&clientSession::handle_read,shared_from_this(), // boost::asio::placeholders::error)); m_socket.async_read_some(boost::asio::buffer(data_,max_len), boost::bind(&clientSession::handle_read,shared_from_this(), boost::asio::placeholders::error)); } else { m_socket.close(); } } private: tcp::socket m_socket; char data_[max_len]; }; class serverApp { typedef boost::shared_ptr<clientSession> session_ptr; public: serverApp(boost::asio::io_service& ioservice,tcp::endpoint& endpoint) :m_ioservice(ioservice), acceptor_(ioservice,endpoint) { session_ptr new_session(new clientSession(ioservice)); acceptor_.async_accept(new_session->socket(), boost::bind(&serverApp::handle_accept,this,boost::asio::placeholders::error, new_session)); } ~serverApp() { } private: void handle_accept(const boost::system::error_code& error,session_ptr& session) { if(!error) { std::cout << "get a new client!" << std::endl; //实现对每个客户端的数据处理 session->start(); //在这就应该看出为什么要封session类了吧，每一个session就是一个客户端 session_ptr new_session(new clientSession(m_ioservice)); acceptor_.async_accept(new_session->socket(), boost::bind(&serverApp::handle_accept,this,boost::asio::placeholders::error, new_session)); } } private: boost::asio::io_service& m_ioservice; tcp::acceptor acceptor_; }; int main(int argc , char* argv[]) { boost::asio::io_service myIoService; short port = 8100/*argv[1]*/; //我们用的是inet4 tcp::endpoint endPoint(tcp::v4(),port); //终端（可以看作sockaddr_in）完成后，就要accept了 serverApp sa(myIoService,endPoint); //数据收发逻辑 myIoService.run(); return 0; }
