Linux系统下简单的C++ socket编程实例

    作者:课课家教育更新于: 2016-02-03 14:15:38

      服务端:

      /*

      Refernce:

      http://www.linuxidc.com/Linux/2011-06/37951.htm

      http://www.oschina.net/code/snippet_153782_16563

      */

      #include

      #include

      #include

      #include

      #include

      #include

      #include

      using namespace std;

      int main()

      {

      struct sockaddr_in s_in;//server address structure

      struct sockaddr_in c_in;//client address structure

      int l_fd,c_fd;

      socklen_t len;

      char buf[1024];//content buff area

      char addr_p[16];

      int port = 8009;

      memset((void *)&s_in,0,sizeof(s_in));

      //bzero((void *)&s_in,sizeof(s_in));

      s_in.sin_family = AF_INET;//IPV4 communication domain

      s_in.sin_addr.s_addr = INADDR_ANY;//accept any address

      s_in.sin_port = htons(port);//change port to netchar

      l_fd = socket(AF_INET,SOCK_STREAM,0);//socket(int domain, int type, int protocol)

      /*bind(int sockfd,struct sockaddr *my_addr, int addrlen);

      sockfd是调用socket函数返回的socket描述符,my_addr是一个指向包含有本机IP地址及端口号等信息的sockaddr类型的指针;addrlen常被设置为sizeof(struct sockaddr)

      */

      bind(l_fd,(struct sockaddr *)&s_in,sizeof(s_in));

      listen(l_fd,10);//lisiening start

      cout<<"begin"<

      while(1){

      /*

      accept()函数让服务器接收客户的连接请求.

      accept(int sockfd, void *addr, int *addrlen);

      sockfd是被监听的socket描述符,addr通常是一个指向sockaddr_in变量的指针,该变量用来存放提出连接请求服务的主机的信息(某台主机从某个端口发出该请求);addrten通常为一个指向值为sizeof(struct sockaddr_in)的整型指针变量。出现错误时accept函数返回-1并置相应的errno值。

      当accept函数监视的socket收到连接请求时,socket执行体将建立一个新的socket,执行体将这个新socket和请求连接进程的地址联系起来

      */

      c_fd = accept(l_fd,(struct sockaddr *)&c_in,&len);

      int n = read(c_fd,buf,1024);//read the message send by client

      inet_ntop(AF_INET,&c_in.sin_addr,addr_p,16);//“二进制整数” -> “点分十进制 *inet_ntop(int af, const void *src, char *dst, socklen_t cnt);

      cout<<"IP: "<

      write(c_fd,buf,n);//sent message back to client

      close(c_fd);

      }

      cout<

      return 0;

      }

      客户端:

      #include

      #include

      #include

      #include

      #include

      #include

      #include

      using namespace std;

      int main(){

      struct sockaddr_in s_in;

      char buf[100];

      int s_fd;

      int port = 8000;

      char *str = "socket net program";

      char *sip = "127.0.0.1";

      memset((void *)&s_in,0,sizeof(s_in));

      s_in.sin_family = AF_INET;

      s_in.sin_port = htons(port);

      inet_pton(AF_INET,sip,(void *)&s_in.sin_addr);

      s_fd = socket(AF_INET,SOCK_STREAM,0);

      /*

      面向连接的客户程序使用connect函数来配置socket并与远端服务器建立一个TCP连接int connect(int sockfd, struct sockaddr *serv_addr,int addrlen) sockfd是socket函数返回的socket描述符;serv_addr是包含远端主机IP地址和端口号的指针;addrlen是远端地址结构的长度

      */

      connect(s_fd,(struct sockaddr *)&s_in,sizeof(s_in));

      cout<<"before: "<

      write(s_fd,str,strlen(str)+1);

      read(s_fd,buf,100);

      cout<<"after: "<

      close(s_fd);

      }

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