学习UDP - udp的小程序
参考博客:https://www.cnblogs.com/skyfsm/p/6287787.html 简单编写了 udp的小程序,udp_client 端通过终端输入字符,然后发送给udp_server。udp_server 接收到后,给udp_client一个响应。 //socket udp 客户端 #include #include #include #include #include #include int main() { //创建socket对象 int sockfd=socket(AF_INET,SOCK_DGRAM,0); if(-1 == sockfd) { printf("socket failed.n"); } //创建网络通信对象 struct sockaddr_in ser_addr; memset(&ser_addr,sizeof(ser_addr)); ser_addr.sin_family =AF_INET; ser_addr.sin_port = htons(8888);//htons(1324); ser_addr.sin_addr.s_addr = inet_addr("192.168.7.224"); // inet_addr("127.0.0.1"); while(1) { printf("Please input a char:"); char cChar; int num = 0; char buf[1024]; scanf("%c",&cChar); getchar(); num = sendto(sockfd,&cChar,sizeof(char),(struct sockaddr*)&ser_addr,sizeof(ser_addr)); printf("client send %d bytes: %c.n",num,cChar); memset(buf,sizeof(buf)); num = recvfrom(sockfd,buf,sizeof(buf),NULL,NULL); printf("client recv %d bytes: %s.nn",buf); } close(sockfd); } //socket udp 服务端 #include #include #include #include #include #include #define INVALID_VALUE -1 #define INVALID_SOCKET -1 int main() { int ret = -1; //创建socket对象 int sockfd=socket(AF_INET,0); // AF_INET:IPV4;SOCK_DGRAM:UDP if(INVALID_SOCKET == sockfd) { printf("socket failed.n"); } //创建网络通信对象 struct sockaddr_in ser_addr; bzero(&ser_addr,sizeof(ser_addr)); ser_addr.sin_family =AF_INET; ser_addr.sin_port = htons(8888); //端口号,需要网络序转换 ser_addr.sin_addr.s_addr= htonl(INADDR_ANY); //IP地址,需要进行网络序转换,INADDR_ANY:本地地址 //绑定socket对象与通信链接 ret =bind(sockfd,sizeof(ser_addr)); if(0>ret) { printf("bind error n"); return -1; } char buf[1024]; //接收缓冲区,1024字节 int count; struct sockaddr_in clent_addr; //clent_addr用于记录发送方的地址信息 socklen_t len = sizeof(clent_addr);; while(1) { memset(buf,sizeof(buf)); count = recvfrom(sockfd,(struct sockaddr*)&clent_addr,&len); //recvfrom是拥塞函数,没有数据就一直拥塞 printf("server recv %d bytes: %s n",count,buf); memset(buf,sizeof(buf)); snprintf(buf,"%s %d %s","recive","bytes"); printf("server send string:%s n",buf); sendto(sockfd,len); //发送信息给client,注意使用了clent_addr结构体指针 } close(sockfd); return 0; } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |