void main(int argc, char** argv)
{
int sockfd, n;
struct sockaddr_in servaddr;
char buff[1000];
if((sockfd=socket(AF_INET, SOCK_STREAM, 0))<0)printf("error socket\n");
// bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family=AF_INET;
// servaddr.sin_addr.s_addr=htonl(202.206.211.151);
servaddr.sin_port=htonl(13);
if((inet_addr( argv[1]))<0)printf("error inet\n");
if(connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr))<0)printf("error connect\n");
while((n=read(sockfd ,buff,1000))>0)
{
buff[n]=0;
fputs(buff, stdout);
}
// exit(0);
}
总是connect出错不止是位身莫,谢谢??
{
int sockfd, n;
struct sockaddr_in servaddr;
char buff[1000];
if((sockfd=socket(AF_INET, SOCK_STREAM, 0))<0)printf("error socket\n");
// bzero(&servaddr, sizeof(servaddr)); servaddr.sin_family=AF_INET;
// servaddr.sin_addr.s_addr=htonl(202.206.211.151);
servaddr.sin_port=htonl(13);
if((inet_addr( argv[1]))<0)printf("error inet\n");
if(connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr))<0)printf("error connect\n");
while((n=read(sockfd ,buff,1000))>0)
{
buff[n]=0;
fputs(buff, stdout);
}
// exit(0);
}
总是connect出错不止是位身莫,谢谢??
另外,connect()有可能和你server端没有accept()有关
if(WSAStartup(0x101,&wsaData)) // 调用的是winsock1.1版本,支持所有平台{//找不到winsock库时的错误处理! 发个警告信息什么的.}3. 在exit()之前加上下面的:
WSACleanup(); // 清洁工作要做好.
估计是你的server端的问题,看看端口是否对应,accept() 是否在阻塞状态
bind()
listen()
accept() <---- connect()
recv() <---- send()
send() ----> recv()
close() <---> close()2. UNIX使用无连接的套接字SOCK_DGRAM使用UDP协议,通信方式如下:UDP Server UDP Clientsocket() socket()
bind()
recvform() <--- sendto()
sendto() ---> recvform()
close() close()你用的是TCP协议,对照你的服务器程序检查一下有没有漏掉哪一步.下面给个实例服务器端程序
/******* 服务器程序 (server.c) ************/
/* #include部分省略 */int main(int argc, char *argv[])
{
int sockfd,new_fd;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size,portnumber;
char hello[]="this is a sample!\n"; if(argc!=2)
{
fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]);
exit(1);
}
if((portnumber=atoi(argv[1]))<0)
{
fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]);
exit(1);
} /* 服务器端开始建立socket描述符 */
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
fprintf(stderr,"Socket error:%s\n\a",strerror(errno));
exit(1);
} /* 服务器端填充 sockaddr结构 */
bzero(&server_addr,sizeof(struct sockaddr_in));
server_addr.sin_family=AF_INET;
server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
server_addr.sin_port=htons(portnumber);
/* 捆绑sockfd描述符 */
if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
fprintf(stderr,"Bind error:%s\n\a",strerror(errno));
exit(1);
}
/* 监听sockfd描述符 */
if(listen(sockfd,5)==-1)
{
fprintf(stderr,"Listen error:%s\n\a",strerror(errno));
exit(1);
} while(1)
{
/* 服务器阻塞,直到客户程序建立连接 */
sin_size=sizeof(struct sockaddr_in);
if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1)
{
fprintf(stderr,"Accept error:%s\n\a",strerror(errno));
exit(1);
} fprintf(stderr,"Server get connection from %s\n",
inet_ntoa(client_addr.sin_addr));
if(write(new_fd,hello,strlen(hello))==-1)
{
fprintf(stderr,"Write Error:%s\n",strerror(errno));
exit(1);
}
/* 这个通讯已经结束 */
close(new_fd);
/* 循环下一个 */
}
close(sockfd);
exit(0);
} 客户端程序 /******* 客户端程序 client.c ************/ /* #include部分省略 */int main(int argc, char *argv[])
{
int sockfd;
char buffer[1024];
struct sockaddr_in server_addr;
struct hostent *host;
int portnumber,nbytes; if(argc!=3)
{
fprintf(stderr,"Usage:%s hostname portnumber\a\n",argv[0]);
exit(1);
}
if((host=gethostbyname(argv[1]))==NULL)
{
fprintf(stderr,"Gethostname error\n");
exit(1);
} if((portnumber=atoi(argv[2]))<0)
{
fprintf(stderr,"Usage:%s hostname portnumber\a\n",argv[0]);
exit(1);
}
/* 客户程序开始建立 sockfd描述符 */
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
exit(1);
} /* 客户程序填充服务端的资料 */
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family=AF_INET;
server_addr.sin_port=htons(portnumber);
server_addr.sin_addr=*((struct in_addr *)host->h_addr);
/* 客户程序发起连接请求 */
if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
fprintf(stderr,"Connect Error:%s\a\n",strerror(errno));
exit(1);
} /* 连接成功了 */
if((nbytes=read(sockfd,buffer,1024))==-1)
{
fprintf(stderr,"Read Error:%s\n",strerror(errno));
exit(1);
}
buffer[nbytes]='\0';
printf("I have received:%s\n",buffer);
/* 结束通讯 */
close(sockfd);
exit(0);
}