本文共 1536 字，大约阅读时间需要 5 分钟。

UDP编程模型：

服务器端程序

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