client.c

基于arm的嵌入式扫描仪和打印机的驱动程序!

#include<stdio.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 3490
#define MAXDATASIZE 100 /*每次最大数据传输量 */
#define SERV_HOST_ADDR "192.168.1.221" 
main(){
int sockfd, recvbytes;
char buf[MAXDATASIZE];
char data[MAXDATASIZE];
struct hostent *host;
struct sockaddr_in serv_addr;
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
perror("socket创建出错！");
exit(1);
}
serv_addr.sin_family=AF_INET;
serv_addr.sin_port=htons(SERVPORT);
serv_addr.sin_addr.s_addr=inet_addr(SERV_HOST_ADDR);
bzero(&(serv_addr.sin_zero),8);
if (connect(sockfd, (struct sockaddr *)&serv_addr,  sizeof(struct sockaddr)) == -1) {
perror("connect出错！");
exit(1);
}
printf("please enter username:");
scanf("%s",data);
if(send(sockfd,data,MAXDATASIZE,0)==-1)
{
perror("send error!");
exit(1);
}
if ((recvbytes=recv(sockfd, buf, MAXDATASIZE, 0)) ==-1) {
perror("recv出错！");
exit(1);
}
buf[recvbytes] = '\0';
printf("Received: %s",buf);
close(sockfd);
}