服务器
cpp
#include<sys/socket.h>
#include<stdio.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>
int main()
{
int ret;
int sfd=socket(AF_INET,SOCK_DGRAM,0);
if(sfd==-1)perror("socket error");
struct sockaddr_in saddr;
saddr.sin_port=htons(8888);
saddr.sin_family=AF_INET;
saddr.sin_addr.s_addr=INADDR_ANY;
ret=bind(sfd,(struct sockaddr*)&saddr,sizeof(saddr));
if(ret==-1)perror("bind error");
char buffer[1024]={'\0'};
while(true)
{
struct sockaddr_in caddr;
int caddrlen=sizeof(caddr);
ret=recvfrom(sfd,buffer,1024,0,(struct sockaddr*)&caddr,(socklen_t*)&caddrlen);
if(ret==-1)
{
perror("recvfrom error");
break;
}
else if(ret==0)
{
printf("连接断开\n");
break;
}
else
{
char ip[30]={'\0'};
inet_ntop(AF_INET,&caddr.sin_addr.s_addr,ip,sizeof(ip));
printf("从客户端%s:%d收到数据:%s\n",ip,htons(caddr.sin_port),buffer);
char sendbuf[50]={'\0'};
sprintf(sendbuf,"server recive your data:%s",buffer);
ret=sendto(sfd,sendbuf,sizeof(sendbuf),0,(struct sockaddr*)&caddr,caddrlen);
if(ret==-1)
{
perror("sendto error");
break;
}
}
memset(buffer,0,1024);
}
close(sfd);
return 0;
}
客户端
cpp
#include<sys/socket.h>
#include<stdio.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>
int main()
{
int ret;
int cfd=socket(AF_INET,SOCK_DGRAM,0);
if(cfd==-1)perror("socket error");
struct sockaddr_in caddr;
caddr.sin_port=htons(8888);
caddr.sin_family=AF_INET;
ret=inet_pton(AF_INET,"192.168.101.231",&caddr.sin_addr.s_addr);
if(ret==-1)perror("inet_pton error");
char buffer[1024]={'\0'};
int i=0;
while(true)
{
char sendbuf[50]={'\0'};
sprintf(sendbuf,"this is client:hello world:%d",i);
ret=sendto(cfd,sendbuf,sizeof(sendbuf),0,(struct sockaddr*)&caddr,sizeof(caddr));
if(ret==-1)
{
perror("sendto error");
break;
}
ret=recvfrom(cfd,buffer,1024,0,NULL,NULL);
if(ret==-1)
{
perror("recvfrom error");
break;
}
else if(ret==0)
{
printf("连接断开\n");
break;
}
else
{
printf("收到了数据:%s\n",buffer);
}
memset(buffer,0,1024);
memset(sendbuf,0,50);
sleep(1);
}
close(cfd);
return 0;
}