C++服务器开发1

1服务器开发代码

#include<sys/socket.h>
#include<sys/types.h>
#include<string.h>
#include<errno.h>
#include<stdio.h>
#include<stdlib.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
/* socket->bind->listen->accept->send/recv->close*/
int main()
{
   int socket_fd;
   int ret;
   char buff[1024];
   int lens;
   socket_fd = socket(AF_INET, SOCK_STREAM, 0);
   struct sockaddr_in server_addr;
   struct sockaddr_in client_addr;
   if (-1 == socket_fd)
   {
       fprintf(stderr, "socket error %s\n", strerror(errno)); // rerror
       exit(0);
   }
   int issockeopet = 1;
   //设置ip地址重复使用
   setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, (const char*)&issockeopet, sizeof(int));
   memset(&server_addr, 0, sizeof(struct sockaddr_in));
   server_addr.sin_family = AF_INET;
   server_addr.sin_port = htons(8888);
   server_addr.sin_addr.s_addr = INADDR_ANY;//自动接受任意IP地址

   ret = bind(socket_fd, (const struct sockaddr*)(&server_addr), sizeof(struct sockaddr));
   if (ret == -1)
   {
       fprintf(stderr, "bind error:%s\n", strerror(errno));
       exit(0);
   }
   if (listen(socket_fd, 10) == -1)
   {
       fprintf(stderr, "listen error:%s\n", strerror(errno));
       exit(0);
   }
   socklen_t len = sizeof(struct sockaddr_in);
   bzero(&client_addr, sizeof(struct sockaddr_in));
   int newfd = accept(socket_fd, (struct sockaddr*)&client_addr, &len);
   if (newfd == -1)
   {
       fprintf(stderr, "accept error:%s\n", strerror(errno));
       exit(0);
   }
   fprintf(stderr, "server connet form %s success\n", inet_ntoa(client_addr.sin_addr));
   while (true)
   {
       lens = read(newfd, buff, strlen(buff) + 1);
       if (lens == -1)
       {
           fprintf(stderr, "read error:%s\n", strerror(errno));
           exit(0);
       }
       printf("rev %s \n", buff);
   }
   close(newfd);
   close(socket_fd);
   return 0;
}

2.客户端开发代码

#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
//服务器的

int main(int argc, char* argv[])
{
   int sock_fd;
   int ret = 0;
   char buff[1024] = {0};
   struct sockaddr_in server_addr;
   if (argc != 2)
   {
       fprintf(stderr,"user:./ip:%s\n",argv[0]);
   }
   sock_fd = socket(AF_INET, SOCK_STREAM, 0);
   if (-1 == sock_fd)
   {
       fprintf(stderr, "socket error:%s\n\a", strerror(errno));
       exit(1);
   }
   memset(&server_addr, 0, sizeof(struct sockaddr_in));
   server_addr.sin_family = AF_INET;
   server_addr.sin_port = htons(8888);
   ret =inet_aton(argv[1], &server_addr.sin_addr);
   if (0==ret)
   {
       fprintf(stderr, "server_ip set error:\n");
       close(sock_fd);
       exit(1);
   }
   //server_addr.sin_addr=
   ret=connect(sock_fd, (const struct sockaddr*)&server_addr, sizeof(struct sockaddr_in));
   if (-1==ret)
   {
       fprintf(stderr, "connect set error:%s\n", strerror(errno));
       close(sock_fd);
       exit(0);
   }
//发数据
   while (1)
   {
       if (fgets(buff, 1024, stdin))
       {
           int lens=write(sock_fd, buff, strlen(buff)+1);
           if (lens <= 0)
           {
               fprintf(stderr, "write set error:%s\n", strerror(errno));
               close(sock_fd);
               exit(1);
           }
       }
   }
   close(sock_fd);
   return 0;
}

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