十六进制数转换为十进制

/*

由于发过来的数据为16进制，故需要把16进制的数据变为10进制，然后由Mat进行保存

*/

static int hex_table[] = { 0,0,0,0,0,0,0,0,0,

0,0,0,0,0,0,0,0,0,

0,0,0,0,0,0,0,0,0,

0,0,0,0,0,0,0,0,0,

0,0,0,0,0,0,0,0,0,

0,0,0,0,1,2,3,4,5,6,

7,8,9,0,0,0,0,0,0,

0,10,11,12,13,14,15,0,0,

0,0,0,0,0,0,0,0,0,

0,0,0,0,0,0,0,0,0,

0,0,0,0,0,0,10,

11,12,13,14,15 };

unsigned char hex_to_decimal(char* hex_str)

{

    char ch;

    unsigned char iret = 0;

    while (ch = *hex_str++)

    {

        iret = (iret << 4) | hex_table[ch];

    }

    return iret;

}