udp实现客户端服务器
服务器端：
#include//服务器端
int main()
{
int sockfd=socket(AF_INET,SOCK_DGRAM,0);//数据报服务的套接子
assert( sockfd!=-1);
struct sockaddr_in saddr;
memset(&saddr,0,sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(6000);//端口，网络字节序列，大端
saddr.sin_addr.s_addr = inet_addr("127.0.0.1");
int res = bind(sockfd,(struct sockaddr*)&saddr,sizeof(saddr));
assert(res != -1);
while(1)
{
struct sockaddr_in caddr;
int len = sizeof(caddr);
char buff[128] = {0};
int n=recvfrom(sockfd,buff,127,0,(struct sockaddr*)&caddr,&len);
printf("recv(%d):%s\n",n,buff);
sendto(sockfd,"ok",2,0,(struct sockaddr*)&caddr,sizeof(caddr));
}
}
客户端：
#include//客户端
int main()
{
int sockfd=socket(AF_INET,SOCK_DGRAM,0);//数据包服务的套接子
assert( sockfd!=-1);
struct sockaddr_in saddr;//代表服务器的端口：ip port
memset(&saddr,0,sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(6000);//指定服务器的端口
saddr.sin_addr.s_addr = inet_addr("127.0.0.1");//指定服务器的ip
while(1)
{
char buff[128]={0};
printf("input:\n");
fgets(buff,128,stdin);
if(strncmp(buff,"end",3)==0)
break;
sendto(sockfd,buff,strlen(buff),0,(struct sockaddr*)&saddr,sizeof(saddr));
memset(buff,0,128);
int len =sizeof(saddr);
recvfrom(sockfd,buff,127,0,(struct sockaddr*)&saddr,&len);
printf("buff=%s\n",buff);
}
close(sockfd);
}