如何将ifr_hwaddr.sa_数据获取到char

如何获取此信息：

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]);

输入此变量（存储在变量中，而不是打印）：

谢谢使用

#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;
}

#包括
int main（int argc，字符**argv）
{
char mac[19]；/*额外一个用于终止'\0'；
你可能想把它放大一点
尽管如此，只是为了确定*/
sprintf（mac，“%02x:%02x:%02x:%02x:%02x:%02x:%02x”，
（未签名字符）项->ifr\u hwaddr.sa\u数据[0]，
（未签名字符）项->ifr\u hwaddr.sa\u数据[1]，
（未签名字符）项->ifr\u hwaddr.sa\u数据[2]，
（未签名字符）项->ifr\u hwaddr.sa\u数据[3]，
（未签名字符）项->ifr\u hwaddr.sa\u数据[4]，
（未签名字符）项->ifr_hwaddr.sa_数据[5]；
printf（“%s\n”，mac）；//字符串已“打印”到mac数组！
返回0；
}

我需要将其保存到变量中，而不是打印它的printf（以s开头）将格式化的输出写入char数组，而不是stdout。看看stdio.h。您将找到printf、fprintf（将格式化字符串写入文件）和sprintf（将格式化字符串写入字符串）。试试我贴的代码。

#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;
}