一个网络客户端和服务器的问题!不明白!求解

xiaofam

我的目的是实现客户端和服务器相互通讯,但发现怎么也实现不了!
好像程序导fgets函数时没有等待输入,就过去了的?
哪位高手帮忙看一下问题出现在哪里啊!我响了很久也不明白啊!
其客户端和服务器程序分别如下:
/******* 客户端程序 client.c ************/
#include <stdio.h>

#include <errno.h>

#include <netdb.h>
#include<sys/socket.h>
#define MAXSIZE 80
int main(int argc, char *argv[])
{
int sockfd,ret;
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);
}
sockfd=socket(AF_INET,SOCK_STREAM,0);
if(sockfd<0)
{
fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
exit(1);
}
/* 客户程序填充服务端的资料 &nb sp; */
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 */
connect(sockfd,(struct sockaddr *)&server_addr,sizeof(struct sockaddr));
char sends[MAXSIZE],recvs[MAXSIZE],sends2[MAXSIZE];
int n;
if(n=fgets(sends,MAXSIZE,stdin)!=NULL)
{
send(sockfd,sends,strlen(sends),0);

}
printf("haha\n");
if(n=recv(sockfd,recvs,MAXSIZE,0)==0)
{
printf("erro!receving data\n");
exit(1);
}
recvs[n]='\0';
fputs(recvs,stdout);
/* 结束通讯 */
close(sockfd);
exit(0);

}
/******* 服务器程序 (server.c) ************/
#include<stdio.h>

#include<errno.h>

#include<netinet/in.h>
#include<sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#define MAXSIZE 80
int main(int argc, char *argv[])
{
int sockfd,new_fd;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size,portnumber;
pid_t pid;
char hello[]="Hello! Are You Fine?\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);
new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size);
if(new_fd<0)
{
fprintf(stderr,"Accept error:%s\n\a",strerror(errno));
exit(1);
}
fprintf(stderr,"sercer get connection from %s\n",inet_ntoa(client_addr.sin_addr));
char recvs[MAXSIZE],sends[MAXSIZE];
int n;
n=recv(sockfd,recvs,MAXSIZE,0);
while(n!=0)
{
recvs[n]='\0';
fputs(recvs,stdout);
if(fgets(sends,MAXSIZE,stdin)!=NULL)
{
send(sockfd,sends,strlen(sends),0);
}
if (n==0) break;
}
}
close(sockfd);
exit(0);
}

bugzilla_zhu

while(1)
{
/* 服务器阻塞,直到客户程序建立连接 */
sin_size=sizeof(struct sockaddr_in);
new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size);
if(new_fd<0)
{
fprintf(stderr,"Accept error:%s\n\a",strerror(errno));
exit(1);
}
fprintf(stderr,"sercer get connection from %s\n",inet_ntoa(client_addr.sin_addr));
char recvs[MAXSIZE],sends[MAXSIZE];
int n;
n=recv(sockfd,recvs,MAXSIZE,0); <====== sockfd => new_fd
while(n!=0)
{
recvs[n]='\0';
fputs(recvs,stdout);
if(fgets(sends,MAXSIZE,stdin)!=NULL)
{
send(sockfd,sends,strlen(sends),0); <====== sockfd => new_fd
}

xiaofam

o !! 怪不得...我试试看!谢谢哦!
还有,人家也指出我这里出了错:
if(n=fgets(sends,MAXSIZE,stdin)!=NULL)
就是!=的优先级高过=,所以应该改成
if((n=fgets(sends,MAXSIZE,stdin))!=NULL)
再试试看!!!^_^,