client.c

linux下socket网络编程实例源代码

#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#define SIZE 10240
char *site="166.111.107.7";
void printusage()
{
printf("please enter the domain port filename \n \n");
}

int sendfile(const char *ip, char *file, int port){
char buf[SIZE];
int s,k;
struct hostent *hp;
struct sockaddr_in addr;
hp=gethostbyname(ip);
if (hp==NULL)
{
perror( "hostent error" );
return -2;
}

if((s=socket(AF_INET,SOCK_STREAM,0))<0){
perror( "socket error" );
return( -1 ); 

}

memset(&addr,0,sizeof(struct sockaddr_in));
addr.sin_family=AF_INET;
addr.sin_port=htons(port);
//addr.sin_addr.s_addr=inet_addr(ip);
memcpy(&addr.sin_addr,hp->h_addr_list[0],hp->h_length);
//addr.sin_addr.s_addr= htonl(INADDR_ANY);
printf("正在与服务器%s:%d连接....\n",ip,port);
if(connect(s,( struct sockaddr * )&addr,sizeof(addr))<0){
perror("connect");
exit(1);
}
//recv(s,buf,sizeof(buf),0);
while ( (k=read( s,buf,sizeof(buf) ) ) >0 )
printf("%s\n",buf);

//while(1)
//{}

return 0;
}

int
main(int argc, char* argv[]){
if(argc!=4) printusage();
else
sendfile(argv[1],argv[3],atoi(argv[2]));
return 0;
}