如何獲得ifr_hwaddr.sa_data燒焦

Question

如何獲取：

printf(" %02x:%02x:%02x:%02x:%02x:%02x", 
(unsigned char)item->ifr_hwaddr.sa_data[0], 
(unsigned char)item->ifr_hwaddr.sa_data[1], 
(unsigned char)item->ifr_hwaddr.sa_data[2], 
(unsigned char)item->ifr_hwaddr.sa_data[3], 
(unsigned char)item->ifr_hwaddr.sa_data[4], 
(unsigned char)item->ifr_hwaddr.sa_data[5]); 

到這個（可變店，不打印）：

char mac[18]; 

感謝

Answer 1

使用

#include <stdio.h> 

int main(int argc, char **argv) 
{ 
    char mac[19]; /* one extra for terminating '\0'; 
        You may want to make it a little larger 
        still, just to be sure. */ 

    sprintf(mac, " %02x:%02x:%02x:%02x:%02x:%02x", 
     (unsigned char)item->ifr_hwaddr.sa_data[0], 
     (unsigned char)item->ifr_hwaddr.sa_data[1], 
     (unsigned char)item->ifr_hwaddr.sa_data[2], 
     (unsigned char)item->ifr_hwaddr.sa_data[3], 
     (unsigned char)item->ifr_hwaddr.sa_data[4], 
     (unsigned char)item->ifr_hwaddr.sa_data[5]); 

    printf("%s\n", mac); // string was "printed" to mac array! 

    return 0; 
}