inet_pton inet_ntop 注意點使用

 #include <string.h>//bzero memset
#include <netinet/in.h>//struct in_addr
#include <sys/socket.h>//AF_INET
#include <arpa/inet.h>
int
main(int argc, char **argv)
{

 char str[]="172.16.10.196";//
 char str1[16];
 struct in_addr myin;
 int ret = 1;

 unsigned long lip = 0xac100ac4;
 
 
 ret = inet_pton(AF_INET,str,&myin);                      //轉換出來的myin是網路序的
 printf("%2X/n",myin.s_addr);
 myin.s_addr = ntohl(myin.s_addr);
 printf("%2X/n",myin.s_addr);
 
 
 printf("%2X/n",lip);
 lip = htonl(lip);                                                           //要先將lip轉換成網路序的
 printf("%2X/n",lip);
 ret = inet_ntop(AF_INET,&lip,str1,__SOCK_SIZE__);
 printf("%s/n",str1);
 
 
 exit(0);
}

inet_pton的輸出是網路序的

inet_ntop的輸入是網路序的

inet_ntop()是協議無關的地址轉換函式,要考慮可重新進入性