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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <fcntl.h>
#define MAX_LISTEN_QUE 5
int main(int argc,char *argv[])
{
int sockfd;
struct sockaddr_in server,client;
char buf[200],read_buf[200];
unsigned int len,length;
time_t timep;
int rv;
//创建套接字
sockfd = socket(AF_INET,SOCK_DGRAM,0);
if(sockfd < 0)
{
perror("Create socket fail");
return -1;
}
//清空结构体中的变量值
bzero(&server, sizeof(server));
//初始化结构体的变量
server.sin_family = AF_INET;//IPv4
server.sin_port = htons(8888);//主机转换到网络
server.sin_addr.s_addr = htonl(INADDR_ANY);//同上(使用这个宏套接字可以绑定到所有的
端口)
//获取结构体地址长度
len = sizeof(struct sockaddr);
//绑定服务器ip地址和端口到套接字
if(bind(sockfd, (struct sockaddr *)&server, len)<0)
{
perror("bind error.");
return -1;
}
while(1)
{
//接收数据
rv = recvfrom(sockfd,read_buf,200,0,
(struct sockaddr *)&client,(socklen_t *)&length);
if(rv < 0){
printf("recvfrom error\n");
close(sockfd);
return -1;
}
//打印接收数据的字节数,发送端的ip和端口号
printf("len :%d\n",rv);
printf("ip:0x%x , port:%d\n",ntohl(client.sin_addr.s_addr),ntohs(client.sin_port));
//打印接收到的内容
printf("read_buf:%s\n",read_buf);
//显示系统的当前时间
timep = time(NULL);
//将数据按照一定的格式转换之后复制到buf
//ctime返回一个表示当地时间的字符串
snprintf(buf, sizeof(buf), "%s", ctime(&timep));
// printf("buf:%s\n",buf);
//发送时间到客户端
sendto(sockfd,buf,strlen(buf),0,
(struct sockaddr *)&client,length);
printf("buf:%s\n",buf);
//清空接受缓存地址,接收数据缓存,时间缓存
bzero(&client,length);
bzero(buf,200);
bzero(read_buf,200);
//关闭套接字
// close(sockfd);
}
//关闭套接字
close(sockfd);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <fcntl.h>
int main(int argc,char *argv[])
{
int sockfd;
struct sockaddr_in server,ser;
char read_buf[400];//存储读取的内容
int length,len;//存储读取的字节数
char buf[100]="hello udp";
int rv,sv;
bzero(read_buf,400);
if((sockfd = socket(AF_INET,SOCK_DGRAM,0)) < 0)//创建套接字
{
printf("socket error\n");
return -1;
}
//结构体中成员变量初始化为0
bzero(&server,sizeof(server));
//初始化成员变量
server.sin_family = AF_INET;//IPv4
server.sin_port = htons(8888);//主机序转换到网络序
inet_pton(AF_INET,"192.168.177.133",&server.sin_addr.s_addr);//转换为地址格式
length = sizeof(struct sockaddr_in);
sendto(sockfd,buf,strlen(buf),0,
(struct sockaddr *)&server,length);
rv = recvfrom(sockfd,read_buf,400,0,
(struct sockaddr *)&ser,(socklen_t *)&len);
if(rv < 0){
printf("recvfrom error\n");
close(sockfd);
return -1;
}
printf("buf:%s\n",read_buf);
//关闭套结字
close(sockfd);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <fcntl.h>
int main(int argc,char *argv[])
{
int sockfd;
struct sockaddr_in server,client;
char buf[200],read_buf[200];
time_t timep;
int rv;
socklen_t length;
//创建套接字
sockfd = socket(AF_INET,SOCK_DGRAM,0);
if(sockfd < 0)
{
perror("Create socket fail");
exit(1);
}
//清空结构体中的变量值
bzero(&server, sizeof(server));
//初始化结构体的变量
server.sin_family = AF_INET;//IPv4
server.sin_port = htons(8888);//主机转换到网络
server.sin_addr.s_addr = htonl(INADDR_ANY);//同上(使用这个宏套接字可以绑定到所有的
端口)
//获取结构体地址长度
length = sizeof(struct sockaddr);
//绑定服务器ip地址和端口到套接字
if(bind(sockfd, (struct sockaddr *)&server, sizeof(server))<0)
{
perror("bind error.");
exit(1);
}
while(1)
{
//接收数据
rv = recvfrom(sockfd,read_buf,200,0,
(struct sockaddr *)&client,(socklen_t *)&length);
if(rv < 0){
printf("recvfrom error\n");
close(sockfd);
exit(1);
}
read_buf[rv]= '\0';
//打印接收数据的字节数,发送端的ip和端口号
printf("len :%d\n",rv);
printf("ip:0x%x , port:%d\n",ntohl(client.sin_addr.s_addr),ntohs(client.sin_port));
//打印接收到的内容
printf("read_buf:%s\n",read_buf);
//显示系统的当前时间
timep = time(NULL);
//将数据按照一定的格式转换之后复制到buf
//ctime返回一个表示当地时间的字符串
snprintf(buf, sizeof(buf), "%s", ctime(&timep));
// printf("buf:%s\n",buf);
//发送时间到客户端
sendto(sockfd,"hello xiaoyi",13,0,
(struct sockaddr *)&client,length);
printf("buf:%s\n",buf);
//清空接受缓存地址,接收数据缓存,时间缓存
bzero(&client,length);
bzero(buf,200);
bzero(read_buf,200);
if(!strcmp(read_buf,"bye"))
break;
}
//关闭套接字
close(sockfd);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <fcntl.h>
int main(int argc,char *argv[])
{
int sockfd;
struct sockaddr_in server,ser;
char read_buf[200];//存储读取的内容
socklen_t length;//存储读取的字节数
char buf[100]="hello udp";
int rv;
bzero(read_buf,200);
if((sockfd = socket(AF_INET,SOCK_DGRAM,0)) < 0)//创建套接字
{
printf("socket error\n");
exit(1);
}
//结构体中成员变量初始化为0
bzero(&server,sizeof(server));
//初始化成员变量
server.sin_family = AF_INET;//IPv4
server.sin_port = htons(8888);//主机序转换到网络序
inet_pton(AF_INET,"192.168.177.133",&server.sin_addr.s_addr);//转换为地址格式
// server.sin_addr.s_addr = inet_addr("192.168.177.133");
length = sizeof(struct sockaddr_in);
sendto(sockfd,buf,strlen(buf),0,
(struct sockaddr *)&server,sizeof(server));
length=sizeof(server);
while(1){
rv = recvfrom(sockfd,read_buf,200,0,
(struct sockaddr *)&ser,&length);
if(rv < 0){
printf("recvfrom error\n");
close(sockfd);
exit(1);
}
read_buf[rv]='\0';
printf("buf:%s\n",read_buf);
break;
}
//关闭套结字
close(sockfd);
return 0;
}