client.c

我自己写的udp服务程序

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>

#define MAXLINE 80
#define PORT 3490

struct control_data
{
    char motor_type;
    char motor_speed;
}contdata,mesg;

int client()
{
   int n,sockfd=-1;
   socklen_t len;
   struct sockaddr_in serveraddr;


   contdata.motor_type='h';
   contdata.motor_speed='k';

   sockfd=socket(AF_INET,SOCK_DGRAM,0);
   if(sockfd!=-1)
   {
      printf("Init socket success!\n");
      //exit(1);
   }
   serveraddr.sin_family=AF_INET;
   serveraddr.sin_port=htons(PORT);
   serveraddr.sin_addr.s_addr=inet_addr("222.194.67.200");
   bzero(&(serveraddr.sin_zero),8);

   if(connect(sockfd,(struct sockaddr*)&serveraddr,sizeof(struct sockaddr))!=-1)
   {  
       printf("Connectted Success!\n");
       //exit(1);
   }
   while(1)
   {
       if(sendto(sockfd,&contdata,sizeof(struct control_data),0,(struct sockaddr*)&serveraddr,sizeof(serveraddr))!=-1)
       {
           printf("Send success!\n");

       }
       n=recvfrom(sockfd,&mesg,sizeof(struct control_data),0,(struct sockaddr*)&serveraddr,&len);
       if(n==-1)
       {
           printf("Recieve Failed!\n");
           printf("%c,%c",mesg.motor_type,mesg.motor_speed);
           exit(1);
       } 
       //read(sockfd,&contdata,sizeof(struct control_data));
       
   }

   close(sockfd);
   return 0;
}