使用C++封装一个socket通信框架

电玩女神 2022-01-05 06:27 571阅读 0赞

封装一组socket常用通信操作，header only 风格。

#pragma once
    
    #include <unistd.h>
    #include <string>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <arpa/inet.h>
    #include <fcntl.h>
    
    #define CHECK_RET(exp) if(!(exp)){ return false; }
    
    class TcpSocket{ 
    public:
      TcpSocket() : _fd(-1){ }
      TcpSocket(int fd) : _fd(fd) { }
    
      bool Socket(){ 
        _fd = socket(AF_INET, SOCK_STREAM, 0); 
        if(_fd < 0){ 
          perror("socket");
          return false;
        }
        return true;
      }
    
      bool Close() const { 
        close(_fd);
        return true;
      }
    
      bool Bind(const std::string& ip, uint16_t port) const { 
        sockaddr_in addr;
        addr.sin_family = AF_INET;
        addr.sin_port = htons(port);
        addr.sin_addr.s_addr = inet_addr(ip.data());
        if(bind(_fd, (sockaddr*)&addr, sizeof(addr)) < 0){ 
          perror("bind");
          return false;
        }
        return true;
      }
    
      bool Listen(int num) const { 
        if(listen(_fd, num) < 0){ 
          perror("listen");
          return false;
        } 
        return 0;
      }
    
      bool Accept(TcpSocket* peer, std::string* ip = NULL, uint16_t* port = NULL) const { 
        sockaddr_in peer_addr;
        socklen_t len = sizeof(peer_addr);
        int new_sock;
        if((new_sock = accept(_fd, (sockaddr*)&peer_addr, &len)) < 0){ 
          perror("accept");
          return false;
        }
        peer->_fd = new_sock;
        if(ip != NULL)
          *ip = inet_ntoa(peer_addr.sin_addr);
        if(port != NULL)
          *port = ntohs(peer_addr.sin_port);
        return true;
      }
    
      bool Recv(std::string* buf) const { 
        buf->clear();
        char tmp[4096] = { 0};
        ssize_t read_size = recv(_fd, tmp, sizeof(tmp), 0);
        if(read_size < 0){  //recv 失败
          perror("recv");
          return false;
        }else if(0 == read_size){   //未读取到数据
          return false;
        }
        buf->assign(tmp, read_size); //填充读取缓冲区数据
        return true; 
      }
      
      bool Send(const std::string& buf) const { 
        if(send(_fd, buf.data(), buf.size(), 0) < 0){ 
          perror("send");
          return false;
        }
        return true;
      }
    
      bool Connect(const std::string& ip, uint16_t port) const { 
        sockaddr_in addr;
        addr.sin_family = AF_INET;
        addr.sin_port = htons(port);
        addr.sin_addr.s_addr = inet_addr(ip.data());
        if(connect(_fd, (sockaddr*)&addr, sizeof(addr)) < 0){ 
          perror("connect");
          return false;
        }
        return true;
      }
      
      int GetFd() const { 
        return _fd;
      }
    private:
      int _fd; //socket句柄
    };