C++ 代码修改(struct)

C++ 代码修改(struct)

代码：

#include<iostream>

using namespace std;

struct InsertInfo
{
	int		*cnode_addr;
	int		*location;
};

typedef int _DWORD;
int main(void)
{
	InsertInfo v119_insInfo; // [sp+58h] [bp-40h]@38
	int a = 5,b = 6;
	int v14,v15;
	v14 = (int)&a;
	v15 = (int)&b;
	int a2 = (int)&v119_insInfo;
	InsertInfo *a3 ;
	a3 = &v119_insInfo;
	*(_DWORD *)(a2 + 4) = v14;
	a3->location =(int*)v14;
	*(_DWORD *)a2 = (int)v15;
	a3->cnode_addr = (int*)v15;

         cout << "a3= " << a3 << endl;
	cout << "*(_DWORD *)(a2 + 4)= " << *(_DWORD *)(a2 + 4) << endl;
	cout << "a3->location = " << a3->location << endl;
	cout << "*(_DWORD *)a2= " << *(_DWORD *)a2 << endl;
	cout << "a3->cnode_addr = " << a3->cnode_addr << endl;

	cout << "*(a3->cnode_addr)= " << *(a3->cnode_addr) << endl;
	cout << "*(a3->location)= " << *(a3->location) << endl;
	return 0;
}

a3= 0012FF5C
*(_DWORD *)(a2 + 4)= 12450 (0x0012FF50)
a3->location = 0012FF50
*(_DWORD *)a2= 1244996 (0x0012FF44)
a3->cnode_addr = 0012FF44
*(a3->cnode_addr)= 6
*(a3->location)= 5

这个结构体里的变量是指针变量：*(_DWORD *)(a2 + 4)代表a3->location的地址，其中a3->location =(int*)v14;表示把v14的地址赋给a3->location，这是a3->location 地址所指向的值等于v14的值，这里是间接的赋值给*location。

a2 代表struct的首地址，struct内的变量也是指针，这样就构成双重指针