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#define offsetof(s,m) (unsigned long)&(((s *)0)->m)
 //->的優(yōu)先級比&要高

struct list{
 char a;
 int b;
 short c;
};

typedef struct list List;

int main()
{
 unsigned char *child = NULL;
 unsigned char *owner = NULL;
 unsigned char *final = NULL;

 List test;
 child = (unsigned char *)&(test.b);//將地址轉(zhuǎn)換為unsigned char *型的指針，賦給child
 owner = (unsigned char *)&test;
 printf("the address of struct is %p\n",owner);
 printf("the address of b is %p\n",child);
 unsigned long offset = offsetof(List,b);
 printf("offset is %p\n",offset);
 final = (unsigned char *)child - offset;//結(jié)構(gòu)成員的地址減去偏移值，得到結(jié)構(gòu)體實例的起始地址。
 printf("after sub offset,the struct address is %p\n",final);
 return 0;
}