如何将ifr_hwaddr.sa_data转换为char

Question

怎么弄这个:

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]);

进入此(存储在变量中,不打印它):

char mac[18];

谢谢

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;
}