?啟動網(wǎng)絡(luò)調(diào)試助手-- 接受數(shù)據(jù)

編寫udp客戶端

#include<stdlib.h> #include<stdio.h> #include<string.h> #include<sys/types.h> #include<sys/socket.h> #include<arpa/inet.h> #include<netinet/in.h> #include<unistd.h>#define N 128 int main(){//1 使用socket函數(shù)創(chuàng)建套接字// 創(chuàng)建一個用于udp網(wǎng)絡(luò)編程的套接字int sockfd = socket(AF_INET, SOCK_DGRAM,0);if(sockfd == -1){perror("fail to socket");exit(1);}//2 填充服務(wù)器網(wǎng)絡(luò)信心結(jié)構(gòu)體socketaddr_instruct sockaddr_in serveraddr;socklen_t addrlen = sizeof(serveraddr);serveraddr.sin_family = AF_INET; // 協(xié)議族 AF_INET:ipv4網(wǎng)絡(luò)協(xié)議serveraddr.sin_addr.s_addr = inet_addr("192.168.0.122"); // ip地址serveraddr.sin_port = htons(8080);char buf[N] = "";//3 發(fā)送數(shù)據(jù)while(1){fgets(buf, N, stdin);//buf[strlen(buf)-1] = '\0'; // 把buf字符串中的\n轉(zhuǎn)化為\0if(sendto(sockfd,buf,N,0,(struct sockaddr *)&serveraddr,addrlen) == -1){perror("fail to sendto");exit(1);}}// 4關(guān)閉套接字文件描述符close(sockfd);return 0; }

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運行udp客戶端

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網(wǎng)絡(luò)調(diào)試助手--發(fā)送數(shù)據(jù)

udp編寫服務(wù)器接受數(shù)據(jù)

#include<stdlib.h> #include<stdio.h> #include<string.h> #include<sys/types.h> #include<sys/socket.h> #include<arpa/inet.h> #include<netinet/in.h> #include<unistd.h>#define N 128 int main(int argc, char const *argv[]){if(argc < 3){fprintf(stderr, "Usage:%s ip port\n",argv[0]);exit(1);}//1 使用socket函數(shù)創(chuàng)建套接字// 創(chuàng)建一個用于udp網(wǎng)絡(luò)編程的套接字int sockfd = socket(AF_INET, SOCK_DGRAM,0);if(sockfd == -1){perror("fail to socket");exit(1);}//2 填充服務(wù)器網(wǎng)絡(luò)信心結(jié)構(gòu)體socketaddr_instruct sockaddr_in serveraddr;socklen_t addrlen = sizeof(serveraddr);serveraddr.sin_family = AF_INET; // 協(xié)議族 AF_INET:ipv4網(wǎng)絡(luò)協(xié)議// inet_addr: 將點分十進制字符串ip地址轉(zhuǎn)為整形數(shù)據(jù)serveraddr.sin_addr.s_addr = inet_addr(argv[1]); // ip地址// atoi 將數(shù)字型字符串轉(zhuǎn)換為整形數(shù)據(jù)// htons 將主機字節(jié)序轉(zhuǎn)化為網(wǎng)絡(luò)字節(jié)序serveraddr.sin_port = htons(atoi(argv[2]));// 3.將網(wǎng)絡(luò)信息結(jié)構(gòu)體與套接字綁定if(bind(sockfd,(struct sockaddr*)&serveraddr, addrlen) == -1){perror("fail to bind");exit(1);}char buf[N] = "";//4 接受數(shù)據(jù)struct sockaddr_in clientaddr;addrlen = sizeof(struct sockaddr_in);while(1){int count = 0;// recvfrom會阻塞if((count = recvfrom(sockfd,buf,N,0,(struct sockaddr*)&clientaddr,&addrlen)) == -1){perror("fail to recvfrom");exit(1);}//打印數(shù)據(jù)printf("client ip:%s port:%d\n",inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));printf("client data:");for(int j=0;j<count;j++){printf("%c",buf[j]); }printf("\n");}// 5關(guān)閉套接字文件描述符close(sockfd);return 0; }

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