xqd_client.c

这是一个简单的复数计算器

#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define SERVPORT 3333
#define MAXDATASIZE 100
main(int argc,char *argv[]){
	int sockfd,recvbytes,server_fd,size,fd;
	char buf[MAXDATASIZE];
	struct hostent *host;
	struct sockaddr_in serv_addr;
	if(argc < 2){
		fprintf(stderr,"Please enter the server's hostname!\n");
		exit(1);
	}
	if((host=gethostbyname(argv[1]))==NULL){
		perror("gethostbyname");
		exit(1);
	}
	if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){
		perror("socket");
		exit(1);
	}
	serv_addr.sin_family=AF_INET;
	serv_addr.sin_port=htons(SERVPORT);
	serv_addr.sin_addr=*((struct in_addr *)host->h_addr);
	bzero(&(serv_addr.sin_zero),8);
	if(connect(sockfd,(struct sockaddr *)&serv_addr,\
		sizeof(struct sockaddr))==-1){
		perror("connect");
		exit(1);
	}
	if((fd=open("./hello2.c",O_CREAT|O_TRUNC|O_WRONLY,0600))<0)
	  {
	    perror("open:");
	    exit(1);
	  }
	while((recvbytes=recv(sockfd,buf,MAXDATASIZE,0))>=1)
	  {
	    if((size=write(fd,buf,100))<0)
	      {
		perror("write:");
		exit(1);
	      }		
	  }
	printf("Received a file!\n");
	
	close(sockfd);
}