test1.c

培训嵌入式linux

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(int argc, char **argv)
{
  if (argc < 2)
  {
    fprintf(stdout, "Usage: %s <x.x.x.x>\n", argv[0]);
    exit(1);
  }

  struct in_addr addr;

  inet_aton(argv[1], &addr);
  //int inet_aton(const char *cp, struct in_addr *inp);
  fprintf(stdout, "%s -> 0x%x\n", argv[1], addr.s_addr);

  in_addr_t addr1;

  addr1 = inet_addr(argv[1]);
  //in_addr_t inet_addr(const char *cp);
  fprintf(stdout, "%s -> 0x%x\n", argv[1], addr1);

  char *p;

#if 0
  struct in_addr *inp;

  inp = (struct in_addr *) &addr1;
  //char *inet_ntoa(struct in_addr in);
  //p = inet_ntoa(*((struct in_addr *) &addr1));
  //p = inet_ntoa(struct in_addr)addr1));
  p = inet_ntoa(*inp);
  //p = inet_ntoa(addr);
#endif

  struct in_addr in;

  in.s_addr = addr1;
  p = inet_ntoa(in);

  fprintf(stdout, "Verify: 0x%x -> %s\n", addr1, p);

  return 0;
}