位序(Byte Order) Big Order转换成 Little Order

前提：int 四个字节

 

typedef unsigned long ulong

 

ulong toInt(ulong  code)
{
 ulong value;
 value = ((((ulong)(code)&(ulong)0x000000ffUL)<<24)|\
    (((ulong)(code)&(ulong)0x0000ff00UL)<<8)|\
    (((ulong)(code)&(ulong)0x00ff0000UL)>>8)|\
    (((ulong)(code)&(ulong)0xff000000UL)>>24));
 return value;
}