面向无连接的SOCKET通信_幸运啤酒盖-ChinaUnix博客

客户端：

点击(此处)折叠或打开

#include
#include
#include
#include
#include
#include
#include
#include
#include


#define REMOTEPORT 4567
#define REMOTEIP "127.0.0.1"

int main(int argc,char *argv[])
{
int s,len;
struct sockaddr_in addr;
int addr_len;
char msg[256];
int i=0;

if((s=socket(AF_INET,SOCK_DGRAM,0))<0)
{
perror("error");
exit(1);
}
else
{
printf("socket created.\n");
printf("socket id : %d\n",s);
printf("remote ip :%s\n",REMOTEIP);
printf("remote port :%d\n",REMOTEPORT);
}

addr_len=sizeof(struct sockaddr_in);
bzero(addr,sizeof(addr));
addr.sin_family=AF_INET;
addr.sin_port=htons(REMOTEPORT);
addr.sin_addr.s_addr=inet_addr(REMOTEIP);

while(1)
{
bzero(msg,sizeof(msg));
len=read(STDIN_FILENO,msg,sizeof(msg));
sendto(s,msg,len,0,addr,addr_len);
printf("\nInput message : %s",msg);
len=recvfrom(s,msg,sizeof(msg),0,addr,addr_len);
printf("%d :",i);
i ;
printf("Received message: %s \n",msg);
}
}

服务器端：

点击(此处)折叠或打开

#include
#include
#include
#include
#include
#include

#define LOCALPORT 4567

int main(int argc,char *argv[])
{
int mysock,len;
struct sockaddr_in addr;
int addr_len;
int i=0;
char msg[256];

if((mysock=socket(AF_INET,SOCK_DGRAM,0))<0)
{
perror("error:");
exit(1);
}
else
{
printf("socket created.\n");
printf("socket id : %d\n",mysock);

}

addr_len=sizeof(struct sockaddr_in);
addr.sin_family=AF_INET;
addr.sin_port=htons(LOCALPORT);
addr.sin_addr.s_addr=htonl(INADDR_ANY);

if(bind(mysock,addr,sizeof(addr))<0)
{
perror("connect:");
exit(1);
}
else
{
printf("bind OK\n");
printf("local port :%d\n",LOCALPORT);
}

while(1)
{
bzero(msg,sizeof(msg));
len=recvfrom(mysock,msg,sizeof(msg),0,addr,addr_len);
printf("%d:",i);
i ;
printf("message from:%s\n",inet_ntoa(addr.sin_addr));
printf("message length:%d\n",len);
printf("message :%s\n",msg);
sendto(mysock,msg,len,0,addr,addr_len);
}
}

测试结果：实现本机上UDP通信，可以通过修改REMOTEIP，REMOTEPORT来实现自己想要的结果。