中小型企业网站建设与管理/seo北京公司

先看下效果 ：

启动服务器端 ：

启动客户端：

 

客户端向服务器端发送：i am client

服务器端收到 并回送 i am server

一直 循环 直到客户端发送 quit 退出系统

客户端发送quit的时候 服务器端也会退出 

 

 作为最基础的socket入门练习 

服务器端代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>#define PORT 6666
#define BACKLOG 10
#define MAX_SIZE	2048int main()
{int socket_fd;struct sockaddr_in server_addr;char buffer[MAX_SIZE]={0};char message[MAX_SIZE];socket_fd = socket(AF_INET,SOCK_STREAM,0);bzero(&server_addr,sizeof(server_addr));server_addr.sin_family = AF_INET;server_addr.sin_port=htons(PORT);server_addr.sin_addr.s_addr = INADDR_ANY;bind(socket_fd,(struct sockaddr *)&server_addr,sizeof(server_addr));listen(socket_fd,BACKLOG);printf("Server bind success \n");struct sockaddr_in peer_addr;socklen_t peer_len  = sizeof(peer_addr);while(1){int client_fd;client_fd = accept(socket_fd,(struct sockaddr* )&peer_addr,&peer_len);printf("Receive a connect from clinet fd[%d,ip:%s,port:%d]\n",client_fd,inet_ntoa(peer_addr.sin_addr),ntohs(peer_addr.sin_port));while (1){memset(buffer,0,sizeof(buffer));int recv_len = recv(client_fd,buffer,MAX_SIZE,0);if(recv_len == 0){printf("Clinet is already closed\n");break;}else{printf("Recv len is %d \n",recv_len);}printf("Clinet says:\n");strcpy(message,buffer);fputs(message,stdout);memset(buffer,0,MAX_SIZE);printf("Please input:\n");fgets(buffer,sizeof(buffer),stdin);send(client_fd,buffer,recv_len,0);}close(client_fd);break;}close(socket_fd);printf("Server exit\n");return 0;}

客户端代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>#define CLIETN_PORT	6666
#define MAX_SIZE 2048int main(int argc,char *argv[])
{if(argc != 2){printf("Please input server ip\n");exit(1);}char buffer[MAX_SIZE];int socket_fd = socket(AF_INET,SOCK_STREAM,0);const char *server_ip = argv[1];struct sockaddr_in server_addr;bzero(&server_addr,sizeof(server_addr));server_addr.sin_family = AF_INET;server_addr.sin_port = htons(CLIETN_PORT);inet_pton(AF_INET,server_ip,&server_addr.sin_addr);connect(socket_fd,(struct sockaddr*)&server_addr,sizeof(server_addr));printf("Connect to server success\n");memset(buffer,0,MAX_SIZE);printf("Please input:\n");while (fgets(buffer,sizeof(buffer),stdin) != NULL){if(strncmp(buffer,"quit",4) == 0){printf("intpu  is: quit break\n");break;}else{printf("intpu  is: %s\n",buffer);			}send(socket_fd,buffer,strlen(buffer),0);memset(buffer,0,sizeof(buffer));recv(socket_fd,buffer,sizeof(buffer),0);printf("Server says:\n");fputs(buffer,stdout);memset(buffer,0,sizeof(buffer));printf("Please input:\n");}printf("Client will be closed\n");close(socket_fd);return 0;
}