TCP客戶端與服務端通訊

#客戶端**：

#include 

#include 
#include 
#include 
#include in.h>
#include 
#include 
#include 
#include 
#define maxline
1024
int main
(int argc,char **ar**)
//建立socketfd
socketfd =
socket
(af_inet
,sock_stream,0
);//初始化
bzero
(&sockaddr,
sizeof
(sockaddr));
sockaddr.sin_family =
af_inet
; sockaddr.sin_port =
htons
(8000);
inet_pton
(af_inet
,servinetaddr,
&sockaddr.sin_addr)
;//請求連線connect
/*if((*/
connect
(socketfd,
(struct sockaddr*
)&sockaddr,
sizeof
(sockaddr));
/*) < 0 )
*/printf
("向服務端傳送資訊:");
//鍵入字串,儲存至sendline
fgets
(sendline,
1024
,stdin)
;//傳送資料
/*if((*/
send
(socketfd,sendline,
strlen
(sendline),0
);/*) < 0)
*///接收資料
n =recv
(socketfd,recvline,
maxline,0
);recvline[n]
='\0'
;printf
("收到加密資訊:%s"
,recvline)
;//關閉客戶端
close
(socketfd)
;exit(0
);}

#include 

#include 
#include 
#include 
#include in.h>
#include 
#include 
#include 
#include 
#include
#define maxline
1024
int main
(int argc,char **ar**)
*///接收資訊
n =recv
(connfd,buff,
maxline,0
);buff[n]
='\0'
;printf
("收到客戶端資訊:%s"
,buff)
;//轉換大小寫
for(int i=
0;buff[i]
!='\0'
;i++)if
(buff[i]
>=
'a'&&buff[i]
<=
'z')
buff[i]
=toupper
(buff[i]);
else
buff[i]
=tolower
(buff[i]);
printf
("傳送加密資訊:%s"
,buff)
;//傳送資訊
send
(connfd,buff,
strlen
(buff),0
);close
(connfd);}
close
(listenfd)
;}

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