Linux socket编程,对套接字进行封装
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转自:http://www.cnblogs.com/-Lei/archive/2012/09/04/2670942.html
下面是对socket操作的封装,因为在Linux下写中文到了windows里面会乱码,所以注释用英文来写,有空再查下解决方法吧
socket.h
#ifndef SOCKET_H#define SOCKET_H#include <sys/socket.h>#include <sys/types.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string>const int MAXCONNECTION=5;const int MAXRECEIVE = 500;class Socket{ public: Socket(); //virtual destructior virtual ~Socket(); // Server initialization bool Create(); //create a socket bool Bind(const int port); bool Listen() const; bool Accept(Socket& clientSocket) const; // Client initialization bool Connect(const std::string& host,const int port); // Data Transmission bool Send(Socket& socket,const std::string& message) const; int Receive(Socket& socket,std::string& message) const; void SetNonBlocking(const bool flag); bool IsValid() const; private: //use m_sockfd to record the result of function socket int m_sockfd; struct sockaddr_in m_address;};#endif
这里解释下为什么析构函数是虚的,如果要用到多态的话,也就是用一个指向基类的指针来处理对不同到对象
如果类的成员函数不是虚函数,只是个普通的函数,那么会出现一种静态绑定到情况,如
Base* pBase = new Derive; //这里Base的析构函数不是虚函数
delete pBase; //这里只会调用Base::~Base(),所以派生类部分的资源将得不到释放
如果析构函数是虚函数的话,那么将调用Derive::~Derive(),由于我们提供了派生类的析构函数,编译器会扩展这个析构函数,
在里面调用基类的析构函数,这样派生类和基类的资源都将得到释放
socket.cpp
#include "Socket.h"#include <stdlib.h>#include <memory.h>#include <iostream>#include <fcntl.h>Socket::Socket():m_sockfd(-1){}Socket::~Socket(){ if(IsValid()) ::close(m_sockfd);}//server functionbool Socket::Create(){ m_sockfd=socket(AF_INET,SOCK_STREAM,0); if(!IsValid()) return false; return true;}bool Socket::Bind(const int port){ if(!IsValid()) return false; m_address.sin_family=AF_INET; m_address.sin_addr.s_addr = htonl(INADDR_ANY); m_address.sin_port=htons(port); int bindReturn=bind(m_sockfd,(struct sockaddr*)&m_address,sizeof(m_address)); if(bindReturn==-1) return false; return true;}bool Socket::Listen()const{ if(!IsValid()) return false; int listenReturn=listen(m_sockfd,MAXCONNECTION); if(listenReturn ==-1) return false; return true;}bool Socket::Accept(Socket& clientSocket) const{ int clientaddrLength=sizeof(clientSocket.m_address); clientSocket.m_sockfd=::accept(m_sockfd,(struct sockaddr*)&clientSocket.m_address,(socklen_t *)&clientaddrLength); if(clientSocket.m_sockfd==-1) return false; return true;}//end server functionsbool Socket::Connect(const std::string& host,const int port){ if(!IsValid()) return false; m_address.sin_family=AF_INET; m_address.sin_port=htons(port); m_address.sin_addr.s_addr=inet_addr(host.c_str()); int connectReturn=::connect(m_sockfd,(struct sockaddr*)&m_address,sizeof(m_address)); if(connectReturn==-1) return false; return true;}// Data Transmissionbool Socket::Send(Socket& socket,const std::string& message) const{ int result=::send(socket.m_sockfd,message.c_str(),message.length(),MSG_NOSIGNAL); if(result==-1) return false; return true;}int Socket::Receive(Socket& socket,std::string& message) const{ char buffer[MAXRECEIVE+1]; message.clear(); memset(buffer,0,MAXRECEIVE+1); int numberRead=::recv(socket.m_sockfd,buffer,MAXRECEIVE,0); if(numberRead==-1) { std::cout<<"error in Socket::Receive\n"; return 0; } else if(numberRead==0) return 0; else { message=buffer; return numberRead; }}void Socket::SetNonBlocking(const bool flag){ if(IsValid())
{
int opts;
opts = fcntl ( m_sockfd,
F_GETFL );
if ( opts < 0 )
{
return;
}
if ( flag )
opts = ( opts | O_NONBLOCK );
else
opts = ( opts & ~O_NONBLOCK );
fcntl ( m_sockfd,
F_SETFL,opts );
}
}bool Socket::IsValid() const{ //if call function socket fail,it returns -1 return m_sockfd!=-1;}
接下来是异常处理到类
#ifndef SocketException_H#define SocketException_H#include <string>class SocketException{ public: SocketException ( std::string description ) : m_description( description ) {}; ~SocketException (){}; std::string Description() { return m_description; } private: std::string m_description;};#endif
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