一个程序理解指针与结构的关系-优快云博客

本文通过一个具体的C语言实例，展示了如何定义和使用结构体与结构体指针，包括初始化、成员访问等操作，并解释了指针与地址的相关概念。

//调试环境 VC6.0

#include <stdio.h>

struct rt_list_node
{
struct rt_list_node * next; // point to next node.
struct rt_list_node * prev; // point to prev node.
};

typedef struct rt_list_node rt_list_t; // Type for lists.

struct rt_object_information
{
unsigned char type;     // object class type.
rt_list_t object_list;    // object list.
unsigned char object_size;   // object size.
};

#define _OBJ_CONTAINER_LIST_INIT(c) /
{&(rt_object_container[c].object_list), &(rt_object_container[c].object_list)}

struct rt_object_information rt_object_container[3] =
{

{0, _OBJ_CONTAINER_LIST_INIT(0), 20},

{1, _OBJ_CONTAINER_LIST_INIT(1), 20},

{2, _OBJ_CONTAINER_LIST_INIT(2), 20},

};

struct rt_list_node test1;
struct rt_list_node test2;

void main(void)
{

volatile unsigned int t1;
//rt_list_t * volatile pt1;

rt_object_container[0].type=0x73;
rt_object_container[0].object_size=0x22;

   test1.next=(struct rt_list_node *)0x1234;
   test1.prev=(struct rt_list_node *)0x5678;

   rt_object_container[0].object_list.next=&test1;
   rt_object_container[0].object_list.prev=&test2;

   t1=(unsigned int) &rt_object_container[0];
   printf("pt0= %x /n/n", t1);

   t1=(unsigned int)&rt_object_container[0].object_list.next;
   printf("pt1= %x /n/n", t1);

   t1=(unsigned int)&rt_object_container[0].object_list.prev;
   printf("pt2= %x /n/n", t1);

   t1= (unsigned int) rt_object_container[0].object_list.next;
   printf("pt3= %x /n/n", t1);

   t1= (unsigned int)rt_object_container[0].object_list.prev;
   printf("pt4= %x /n/n", t1);


   t1= (unsigned int)rt_object_container[0].object_list.next -> prev;
   printf("pt5= %x /n/n", t1);

t1= (unsigned int)&rt_object_container[0].object_list.next -> prev;
printf("pt55= %x /n/n", t1);

t1= (unsigned int)rt_object_container[0].object_list.next->next;
printf("pt6= %x /n/n", t1);

t1= (unsigned int)&rt_object_container[0].object_list.next->next;
printf("pt66= %x /n/n", t1);

t1= (unsigned int)&rt_object_container[0].object_list.next->next->next;
printf("pt666= %x /n/n", t1);

t1= (unsigned int)&rt_object_container[0].object_list.next->next->prev;
printf("pt6666= %x /n/n", t1);

t1= (unsigned int)rt_object_container[0].object_list.next->next->prev;
printf("pt66666= %x /n/n", t1);

}

//特别是提示出错信息0X1238内存不能读。把0x1238作为了一个地址，此地址是受操作系统保护的。

//仔细理解源码中每行、每字符的意义，可以比较好的理解指针、地址、结构体、结构体指针之间的关系。