Linux基于TCP/IP简单的客户端、服务器通信程序实例

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服务器端代码：

/*************************************************************************> File Name: server.c> Author: fucang_zxx> Mail: fucang_zxx@163.com > Created Time: Sun 24 Jul 2016 03:45:21 PM CST ************************************************************************/#include <stdio.h>#include <string.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/un.h>#include <arpa/inet.h>#include <netinet/in.h>const int port = 8080;const char* ip = "192.168.64.128"; int main(){  //创建套接字,即创建socket   int ser_sock = socket(AF_INET, SOCK_STREAM, 0);   if(ser_sock < 0)  {  //创建失败  perror("socket");  return 1;  }  //绑定信息，即命名socket   struct sockaddr_in addr;   addr.sin_family = AF_INET;   addr.sin_port = htons(port);   //inet_addr函数将用点分十进制字符串表示的IPv4地址转化为用网络    //字节序整数表示的IPv4地址   addr.sin_addr.s_addr = inet_addr(ip);   if(bind(ser_sock, (struct sockaddr*)&addr, sizeof(addr)) < 0)   {                   //命名失败        perror("bind");        return 2;      }   //监听socket  int listen_sock = listen(ser_sock, 5);  if(listen_sock < 0)  {  //监听失败  perror("listen");  return 3;  }      //接受连接  //系统调用从listen监听队列中接受一个连接  //int accept(int sockfd, struct sockaddr* addr, socklen_t* addrlen)  //sockfd参数是执行过listen系统调用的监听socket；addr参数用来获取被  //接受连接的远端socket地址，该socket地址的长度由addrlen参数指出  //accept成功时返回一个新的连接socket，该socket唯一的标识了被接受  //的这个连接，服务器可通过读写该socket来与被接受连接对应的客户端通信  struct sockaddr_in peer;  socklen_t peer_len;  char buf[1024];  int accept_fd = accept(ser_sock, (struct sockaddr*)&peer, &peer_len);  if(accept_fd < 0)  {  perror("accept");  return 4;  }  else  {  printf("connected with ip: %s  and port: %d\n", inet_ntop(AF_INET,&peer.sin_addr, buf, 1024), ntohs(peer.sin_port));  }  while(1)  {  memset(buf, '\0', sizeof(buf));  ssize_t size = read(accept_fd, buf, sizeof(buf) - 1);//  printf("size = %d\n", size);//  printf("buf = %s\n", buf);  if(size > 0)  {  printf("client#: %s\n", buf);  }  else if(size == 0)  {  printf("read is done...\n");  break;  }  else   {  perror("read");  break;  }          printf("server please enter: ");  fflush(stdout);          size = read(0, buf, sizeof(buf) - 1);  if(size > 0)  {  buf[size - 1] = '\0';  }  else if(size == 0)  {  printf("read is done...\n");  break;  }  else  {  perror("read");  break;  }    write(accept_fd, buf, strlen(buf));  }close(ser_sock);  return 0;}

客户端代码：

/*************************************************************************> File Name: client.c> Author: fucang_zxx> Mail: fucang_zxx@163.com > Created Time: Sun 24 Jul 2016 03:45:21 PM CST ************************************************************************/#include <stdio.h>#include <string.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/un.h>#include <arpa/inet.h>#include <netinet/in.h>const int port = 8080;const char* ip = "192.168.64.128"; int main(){  //创建套接字,即创建socket   int clt_sock = socket(AF_INET, SOCK_STREAM, 0);   if(clt_sock < 0)  {  //创建失败  perror("socket");  return 1;  }  //绑定信息，即命名socket   struct sockaddr_in addr;   addr.sin_family = AF_INET;   addr.sin_port = htons(port);   //inet_addr函数将用点分十进制字符串表示的IPv4地址转化为用网络    //字节序整数表示的IPv4地址   addr.sin_addr.s_addr = inet_addr(ip);   //不需要监听  //发起连接//  struct sockaddr_in peer;  socklen_t addr_len = sizeof(addr);  int connect_fd = connect(clt_sock, (struct sockaddr*)&addr, addr_len);  if(connect_fd < 0)  {  perror("connect");  return 2;  }  char buf[1024];  while(1)  {  memset(buf, '\0', sizeof(buf));  printf("client please enter: ");  fflush(stdout);  ssize_t size = read(0, buf, sizeof(buf) - 1);  if(size > 0)  {  buf[size - 1] = '\0';  }  else if(size == 0)  {  printf("read is done...\n");  break;  }  else  {  perror("read");  return 4;  } // printf("client: %s\n", buf);          write(clt_sock, buf, strlen(buf));  size = read(clt_sock, buf, sizeof(buf));  if(size > 0)  {   buf[size] = '\0';  }  else if(size == 0)  {  printf("read is done...\n");  break;  }  else   {  perror("read");  return 5;  }  printf("server: %s\n", buf);   }  close(clt_sock);  return 0;}

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