网络编程之socket编程实例

简单实例1

server.c

 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <sys/socket.h>
 #include <pthread.h>

 int sockfd;//服务器socket
 ];//客户端的socketfd,100个元素，fds[0]~fds[99]
  ;//用来控制进入聊天室的人数为100以内
 char* IP = "0.0.0.0";
 ;
 typedef struct sockaddr SA;

 void init(){
     sockfd = socket(PF_INET,SOCK_STREAM,);
     ){
         perror("创建socket失败");
         exit(-);
     }
     struct sockaddr_in addr;
     addr.sin_family = PF_INET;
     addr.sin_port = htons(PORT);
     addr.sin_addr.s_addr = inet_addr(IP);
     ){
         perror("绑定失败");
         exit(-);
     }
     ) == -){
         perror("设置监听失败");
         exit(-);
     }
 }

 void SendMsgToAll(char* msg){
     int i;
     ;i < size;i++){
         ){
             printf("sendto%d\n",fds[i]);
             send(fds[i],msg,strlen(msg),);
         }
     }
 }

 void* service_thread(void* p){
     int fd = *(int*)p;
     printf("pthread = %d\n",fd);
     ){
         ] = {};
         ) <= ){
             int i;
             ;i < size;i++){
                 if (fd == fds[i]){
                     fds[i] = ;
                     break;
                 }
             }
                 printf("退出：fd = %dquit\n",fd);
                 pthread_exit((void*)i);
         }
         //把服务器接受到的信息发给所有的客户端
         SendMsgToAll(buf);
     }
 }

 void service(){
     printf("服务器启动\n");
     ){
         struct sockaddr_in fromaddr;
         socklen_t len = sizeof(fromaddr);
         int fd = accept(sockfd,(SA*)&fromaddr,&len);
         ){
             printf("客户端连接出错...\n");
             continue;
         }
         ;
         ;i < size;i++){
             ){
                 //记录客户端的socket
                 fds[i] = fd;
                 printf("fd = %d\n",fd);
                 //有客户端连接之后，启动线程给此客户服务
                 pthread_t tid;
                 pthread_create(&tid,,service_thread,&fd);
                 break;
             }
         if (size == i){
             //发送给客户端说聊天室满了
             char* str = "对不起，聊天室已经满了!";
             send(fd,str,strlen(str),);
             close(fd);
         }
         }
     }
 }

 int main(){
     init();
     service();
 }

client.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <pthread.h>

 int sockfd;//客户端socket
 char* IP = "192.168.1.105";//服务器的IP
 ;//服务器服务端口
 typedef struct sockaddr SA;
 ];

 void init(){
     sockfd = socket(PF_INET,SOCK_STREAM,);
     struct sockaddr_in addr;
     addr.sin_family = PF_INET;
     addr.sin_port = htons(PORT);
     addr.sin_addr.s_addr = inet_addr(IP);
     ){
         perror("无法连接到服务器");
         exit(-);
     }
     printf("客户端启动成功\n");
 }

 void start(){
     pthread_t id;
     void* recv_thread(void*);
     pthread_create(&id,,recv_thread,);
     ] = {};
     sprintf(buf2,"%s进入了聊天室",name);
     send(sockfd,buf2,strlen(buf2),);
     ){
         ] = {};
         scanf("%s",buf);
         ] = {};
         sprintf(msg,"%s:%s",name,buf);
         send(sockfd,msg,strlen(msg),);
         ){
             memset(buf2,,sizeof(buf2));
             sprintf(buf2,"%s退出了聊天室",name);
             send(sockfd,buf2,strlen(buf2),);
             break;
         }
     }
     close(sockfd);
 }

 void* recv_thread(void* p){
     ){
         ] = {};
         ) <= ){
             return;
         }
         printf("%s\n",buf);
     }
 }

 int main(){
     init();
     printf("请输入您的名字：");
     scanf("%s",name);
     start();
     ;
 }