一、客户端
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<stdio.h>
#include<errno.h>
#include<time.h>
#include<string.h>
void main()
{
char send_data[20]="im sender data";
int fd;
struct sockaddr_in local_addr,to_addr;
fd=socket(AF_INET，SCOK_DGRAM,0);
if(fd<0)
{
printf("create socket error");
return;
}
local_addr.sin_family=AF_INET;
local_addr.sin_port=htons(7777);
local_addr.sin_addr.s_addr=INADDR_ANY;
to_addr.sin_family=AF_INET;
to_addr.sin_port=htons(8888);
to_addr.sin_addr.s_addr=INADDR_ANY;
if(-1 == bind(fd,(struct sockaddr*)&local_addr,sizeof(local_addr)))
{
printf("bind error );
close(fd);
return;
}
printf("bind success");
while(1)
{
sleep(1);
if(-1 != sendto(fd,send_data,sizeof(send_data),0,(struct sockaddr*)&to_addr,sizeof(to_addr)))
printf("send success ");
else
printf("send error ");
}
}
二、服务器
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<stdio.h>
#include<errno.h>
#include<time.h>
#include<string.h>
void main()
{
int fd;
int n;
char rcv_buf[256];
socklen_t servlen;
struct sockaddr_in from_addr,temp_addr;
fd=socket(AS_INET,SOCK_DGRAM,0);
if(fd<0)
{
printf("create socket error");
return;
}
from_addr.sin_family=AF_INET;
from_addr.sin_port=htons(8888);
from_addr.sin_addr.s_addr=INADDR_ANY;
servlen=sizeof(tem_addr);
if(-1 == bind(fd,(struck sockaddr*)&from_addr,sizeof(struck sockaddr_in)))
{
printf("bind error");
return;
}
while(1)
{
bzero(rcv_buf,256);
n=rcvfrom(fd,rcv_buf,256,0,(struct sockaddr*)&temp_addr,&servlen);
rcv_buf[n]=0;
printf("rcvdata:%s ",rcv_buf);
}
}
ps:
1、unsigned short int htons(unsigned short int hostshort);将参数指定的16位hostshort转换成网络字符顺序。
2、int inet_aton(const char * cp,struct in_addr *inp);将参数cp所指的网络地址字符串转换成网络使用的二进制的数字, 然后存于参数inp所指的in_addr结构中。