succ_omc_client_flex.c

基于Linux的网络编程

#include<sys/types.h>
#include<sys/socket.h>
#include<stdio.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<string.h>
#include<netdb.h>

#define LOCAL_SERVER_PORT 8092
#define MAX_MSG 100

int main(int argc, char *argv[])
{
  int s, rc, i, n, j,m ;
  struct sockaddr_in cliAddr,remoAddr,recevAddr;
  char msg[MAX_MSG];
  char msg1[3];
  struct hostent *h;
  int strlen=3;
  m=0x04;

 // if(argc<2)
 // {
  // printf("usage : %s \n",argv[0]);
  // exit(1);
 // }

 // h=gethostbyname(argv[1]);//此参数应该为192.168.2.222，用了这反倒是画蛇添足。
 // if(h==NULL)
 // {
   // printf("%s:unknown host '%s'\n",argv[0],argv[1]);
   // exit(1);
 // }
//  printf("%s: sending data to '%s' (IP :%s) \n",argv[0],h->h_name,inet_ntoa(*(struct in_addr *)h->h_addr));

  s=socket(AF_INET, SOCK_DGRAM, 0);
  if(s<0)
  {
    printf("%s:cannot open socket\n",argv[0]);
    exit(1);
  }

   remoAddr.sin_family=AF_INET;
   remoAddr.sin_port=htons(LOCAL_SERVER_PORT);
   remoAddr.sin_addr.s_addr=inet_addr("192.168.2.222");
 // printf("1\n");
   for(i=0;i<5;i++)
  {

   memset(msg1,0,30);
   memcpy(msg1,&strlen,2);
   msg1[2]=m;
//   printf("%d",msg1[2]);
   m++;
//   printf("%02x\n%02x\n%02x\n",msg1[0],msg1[1],msg1[2]);
    rc=sendto(s, msg1,sizeof(msg1), 0,(struct sockaddr *) &remoAddr, sizeof(remoAddr));
    if(rc<0)
    {
      printf("%s: cannot send data %d \n",argv[0],i-1);
      close(s);
      exit(1);
    }

//   printf("3\n");
    memset(msg, 0x0, MAX_MSG);
    j=sizeof(cliAddr);
    n=recvfrom(s, msg, MAX_MSG, 0, (struct sockaddr *) &cliAddr, &j);
    if(n<0)
    {
      printf("%s cannot receive data\n",argv[0]);
      exit(1);
    }
      printf("%s\n",msg);
  }
   return 1;

}