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TCP编程模型：

服务器端程序

#include
   
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          /*定义了struct sockaddr_in*/void main(){ int sockfd; /*创建socket*/ sockfd=socket(AF_INET,SOCK_STREAM,0); if(sockfd==-1) { printf("create socket false"); exit(1); } /*绑定地址*/ struct sockaddr_in server_addr; server_addr.sin_family=AF_INET; server_addr.sin_port=htons(5000); server_addr.sin_addr.s_addr=htonl(INADDR_ANY); if(bind(sockfd,(const struct sockaddr *)(&server_addr),sizeof(server_addr))==-1) { printf("bind false"); exit(1); } /*监听端口*/ listen(sockfd,3); /*等待连接*/ int newfd; struct sockaddr_in client_addr; int addrlen=sizeof(client_addr); newfd=accept(sockfd,(struct sockaddr *)(&client_addr),&addrlen); /*收发数据*/ char buf[128]; recv(newfd,buf,128,0); printf("the message is from :%s\n",inet_ntoa(client_addr.sin_addr)); printf("the message received is %s\n",buf); /*结束连接*/ close(newfd); close(sockfd);}
         
        
       
      
     
    
   

客户端程序

#include
   
    #include
    
     #include
     
      #include
      
       #include
       
        #include
        
         #include
         
          /*定义了struct sockaddr_in*/void main(){ /*创建socket*/ int sockfd=socket(AF_INET,SOCK_STREAM,0); if(sockfd==-1) { printf("create socket false"); exit(1); } /*连接服务器*/ struct sockaddr_in server_addr; server_addr.sin_family=AF_INET; server_addr.sin_port=htons(5000); server_addr.sin_addr.s_addr=inet_addr("192.168.137.246"); if(connect(sockfd,(const struct sockaddr *)(&server_addr),sizeof(server_addr))==-1) { printf("connect false"); exit(1); } /*收发数据*/ printf("please enter your message\n"); char buf[128]; scanf("%s",buf); send(sockfd,buf,128,0); /*结束连接*/ close(sockfd);}