#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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

 
 /*
连接到服务器后，会不停循环，等待输入，
输入quit后，断开与服务器的连接
*/
 
int main()
 
{
 
 int clientfd;
 struct sockaddr_in serverAddr;
 char sendbuf[200];
 char recvbuf[200];
 int iDataNum;
 char a[] = "192.168.209.193";
 char *str = a;
 int port = 61;

 if((clientfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
 {
  printf("socket error");
  return -1;
 }
  
  bzero(&serverAddr, sizeof(serverAddr)); 
  serverAddr.sin_family = AF_INET;
  serverAddr.sin_port = htons(port);
  printf("the value of str:%s\n", str);
  //将字符串的IP地址转化为网络字节序
  int ret = inet_pton(AF_INET, str, &serverAddr.sin_addr);
  printf("the value of ret is:%d\n",ret);
  printf("inet_pton:0x%x\n", serverAddr.sin_addr.s_addr);
  if(ret < 0)
  {
   printf("error");
   return -1;

  }

  int i = connect(clientfd, (struct sockaddr *)&serverAddr, sizeof(serverAddr)); 
  printf("the value of i is:%d\n", i);
  
  if(i < 0)
  {
    fprintf(stderr, "socket connect error=%d(%s)\n", errno, strerror(errno));
   return -1;
  }
 
  printf("连接到主机...\n");
 
  while(1)
  {
   printf("发送消息:");
   scanf("%s", sendbuf);
   printf("\n");
 
   send(clientfd, sendbuf, strlen(sendbuf), 0);
   if(strcmp(sendbuf, "quit") == 0)
   break;
 
   printf("读取消息:");
   recvbuf[0] = '\0';
   iDataNum = recv(clientfd, recvbuf, 200, 0);
   recvbuf[iDataNum] = '\0';
   printf("%s\n", recvbuf);
 }
 
 close(clientfd);
 return 0;
 
}