connect()在UDP连接中的应用一例

#include<stdio.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#include<string.h>

#include<strings.h>

#include<stdlib.h>

#include<unistd.h>

#defineN256

typedefstructsockaddrSA;

intmain(void)

{

intsockfd;

structsockaddr_inmy_addr;

charbuffer
;

if((sockfd=socket(PF_INET,SOCK_DGRAM,0))<0)

{

perror("failtosocket");

exit(-1);

}

while(1)

{

bzero(buffer,N);

printf("exit?Y/N");

fgets(buffer,N,stdin);

if(strncmp(buffer,"Y",1)==0)

{

break;

}

else

{

bzero(&my_addr,sizeof(my_addr));

my_addr.sin_family=PF_INET;

printf("pleaseinputserver'sip>");

fgets(buffer,N,stdin);

buffer[strlen(buffer)-1]='\0';

my_addr.sin_addr.s_addr=inet_addr(buffer);

printf("pleaseinputserver'sport>");

fgets(buffer,N,stdin);

buffer[strlen(buffer)-1]='\0';

my_addr.sin_port=htons(atoi(buffer));

connect(sockfd,(SA*)&my_addr,sizeof(my_addr));

while(1)

{

fgets(buffer,N,stdin);

if(strncmp(buffer,"quit",4)==0)

{

break;

}

send(sockfd,buffer,N,0);

bzero(buffer,N);

recv(sockfd,buffer,N,0);

printf("receivefromtheserver>%s",buffer);

}

}

}

close(sockfd);

return0;

}