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求救!!:关于UNIX系统UDP编程问题
#include <stdlib.h>;
#include <stdio.h>;
#include <errno.h>;
#include <string.h>;
#include <unistd.h>;
#include <netdb.h>;
#include <sys/socket.h>;
#include <netinet/in.h>;
#include <sys/types.h>;
#include <arpa/inet.h>;
#define MAX_BUF_SIZE 1024
void udpc_requ(int sockfd,const struct sockaddr_in *addr,socklen_t len)
{
char buffer[MAX_BUF_SIZE];
int n;
while(fgets(buffer,MAX_BUF_SIZE,stdin))
{ /* 从键盘读入,写到服务端 */
sendto(sockfd,buffer,strlen(buffer),0,addr,len);
bzero(buffer,MAX_BUF_SIZE);
/* 从网络上读,写到屏幕上 */
memset(buffer, 0, sizeof(buffer));
n=recvfrom(sockfd,buffer,MAX_BUF_SIZE, 0, NULL, NULL);
if(n <= 0)
{
fprintf(stderr, "Recv Error %s\n", strerror(errno));
return;
}
buffer[n]=0;
fprintf(stderr, "get %s", buffer);
}
}
int main(int argc,char **argv)
{
int sockfd,port;
struct sockaddr_in addr;
u_short port;
char buf[] = "127.0.0.1";
port = 8888;
/*if(argc!=3)
{
fprintf(stderr,"Usage:%s server_ip server_port\n",argv[0]);
exit(1);
} */
sockfd=socket(AF_INET,SOCK_DGRAM,0);
if(sockfd<0)
{
fprintf(stderr,"Socket Error:%s\n",strerror(errno));
exit(1);
}
/* 填充服务端的资料 */
bzero(&addr,sizeof(struct sockaddr_in));
addr.sin_family=AF_INET;
addr.sin_port=htons(port);
if(inet_aton(buf,&addr.sin_addr)<0)
{
fprintf(stderr,"Ip error:%s\n",strerror(errno));
exit(1);
}
if(connect(sockfd, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) == -1)
{
fprintf(stderr, "connect error %s\n", strerror(errno));
exit(1);
}
udpc_requ(sockfd,&addr,sizeof(struct sockaddr_in));
close(sockfd);
}
所有的需要输入的参数都是定值 看看结果: |
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