Linux socket编程（二）服务器与客户端的通信

http://www.cnblogs.com/-Lei/archive/2012/09/04/2670964.html

上一篇写了对套接字操作的封装，这一节使用已封装好的Socket类实现服务器与客户端的通信（Socket的定义见上篇Socket.h)

服务器端：

ServerSocket.h

#ifndef SERVERSOCKET_H
#define SERVERSOCKET_H#include "Socket.h"class ServerSocket:public Socket
{public:ServerSocket(const int port);ServerSocket();virtual ~ServerSocket();void Accept(Socket& socket);
};#endif

ServerSocket.cpp

#include "ServerSocket.h"
#include "SocketException.h"ServerSocket::ServerSocket(const int port)
{if ( ! Socket::Create() ){throw SocketException ( "Could not create server socket." );}if ( ! Socket::Bind ( port ) ){throw SocketException ( "Could not bind to port." );}if ( ! Socket::Listen() ){throw SocketException ( "Could not listen to socket." );}
}ServerSocket::~ServerSocket()
{
}void ServerSocket::Accept(Socket& socket)
{if ( ! Socket::Accept ( socket ) ){throw SocketException ( "Could not accept socket." );}
}

//============================================================================
// Name        : ChatServer.cpp
// Author      : Lei
// Version     :
// Copyright   : 
// Description : ChatServer in C++, Ansi-style
//============================================================================

#include <iostream>
#include <string>
#include "ServerSocket.h"
#include "SocketException.h"
using namespace std;int main()
{cout<<"Running server..."<<endl;try{ServerSocket server(8080);while(true){Socket newSocket;server.Accept(newSocket);try{string message;server.Receive(newSocket,message);cout<<"Receive message: "<<message<<endl;message="Here is server";server.Send(newSocket,message);}catch(SocketException&){}}}catch(SocketException& ex){cout << "Exception was caught:" << ex.Description() << "\nExiting.\n";}return 0;
}

接下来是客户端：

ClientSocket.h

#ifndef CLIENTSOCKET_H
#define CLIENTSOCKET_H#include "Socket.h"
#include <string>class ClientSocket:public Socket
{public:ClientSocket (const std::string& host,const int port );virtual ~ClientSocket();bool Send(const std::string& message) ;int Receive(std::string& message) ;
};#endif

ClientSocket.cpp

#include "ClientSocket.h"
#include "SocketException.h"ClientSocket::ClientSocket(const std::string& host,const int port)
{if(!Socket::Create())throw SocketException("Could not create client socket.");if(!Socket::Connect(host,port))throw SocketException( "Could not connect to port." );
}ClientSocket::~ClientSocket()
{}bool ClientSocket::Send(const std::string& message)
{return Socket::Send(static_cast<Socket&>(*this),message);
}int ClientSocket::Receive(std::string& message)
{return Socket::Receive(static_cast<Socket&>(*this),message);
}

这里使用了 dynamic_cast来将this指针向下转型，转成指向基类Socket的指针

//============================================================================
// Name        : ChatClient.cpp
// Author      : Lei
// Version     :
// Copyright   : 
// Description : ChatClient in C++, Ansi-style
//============================================================================

#include <iostream>
#include <string>
#include "ClientSocket.h"
#include "SocketException.h"
using namespace std;int main()
{cout<<"Running client...."<<endl;try{ClientSocket clientSocket("127.0.0.1",8080);clientSocket.Send("Hello,here is client");string message;clientSocket.Receive(message);cout<<"Response from server: "<<message<<endl;}catch(SocketException& ex){cout << "Exception was caught:" << ex.Description() << "\n";}return 0;
}