c 16进制输出 c语言socket编程指南(17)

exit(1);

}

printf("got packet from %s/n",inet_ntoa(their_addr.sin_addr));

printf("packet is %d bytes long/n",numbytes);

buf[numbytes] = '/0';

printf("packet contains /"%s/"/n",buf);

close(sockfd);

}

注意在我们的调用 socket()，我们最后使用了 SOCK_DGRAM。同时， 没有必要去使用 listen() 或者 accept()。我们在使用无连接的数据报套接 字！

下面是 talker.c：

#include

#include

#include

#include

#include

#include

#include

#include

#define MYPORT 4950 /* the port users will be sending to */

int main(int argc, char *argv[])

{

int sockfd;

struct sockaddr_in their_addr; /* connector's address information */

struct hostent *he;

int numbytes;

if (argc != 3) {

fprintf(stderr,"usage: talker hostname message/n");

exit(1);

}

if ((he=gethostbyname(argv[1])) == NULL) { /* get the host info */

herror("gethostbyname");

exit(1);

}

if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {

perror("socket");

exit(1);

}

their_addr.sin_family = AF_INET; /* host byte order */

their_addr.sin_port = htons(MYPORT); /* short, network byte order

*/

their_addr.sin_addr = *((struct in_addr *)he->h_addr);

bzero(&(their_addr.sin_zero),; /* zero the rest of the struct */

if ((numbytes=sendto(sockfd, argv[2], strlen(argv[2]), 0, /

(struct sockaddr *)&their_addr, sizeof(struct sockaddr))) == -1) {

perror("sendto");

exit(1);

}

printf("sent %d bytes to

%s/n",numbytes,inet_ntoa(their_addr.sin_addr));

close(sockfd);

return 0;

}

这就是所有的了。在一台机器上运行 listener，然后在另外一台机器上 运行 talker。观察它们的通讯！

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