客户端代码 client.c
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr;
sockfd = socket(PF_INET, SOCK_DGRAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(50001);
servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
char sendline[100];
sprintf(sendline, "Hello, world!");
sendto(sockfd, sendline, strlen(sendline), 0, (struct sockaddr *)&servaddr, sizeof(servaddr));
close(sockfd);
return 1;
}
服务器端代码 server.c
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr;
sockfd = socket(PF_INET, SOCK_DGRAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(50001);
bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
int n;
char recvline[1024];
recvfrom(sockfd, recvline, 1024, 0, NULL, NULL);
printf("%s\n", recvline);
close(sockfd);
}