在C更改结构的地址 [英] Change address of struct in C

问题描述

让我们说，我得到了一个结构，我需要所有它的属性分配给一个特定的地址。下面的code是给我一个有条件的错误，但我并不想对其进行评估。

Let's say that I was given a struct and I need to assign all of it's attributes to a particular address. The code below is giving me a conditional error, but i'm not trying to evaluate it.

struct header block_o_data;
block_o_data.a = 1;
block_o_data.b = 2;
void* startingAddress = sbrk(0);
&block_o_data = *address;

请让我知道什么即时通讯做错了。

Please let me know what im doing wrong.

推荐答案

假设你有一个这样的结构：

Suppose you have a struct like this:

struct mystruct {
    int a;
    char b;
};

，那么你可能需要的东西是这样的：

then you probably need something like this:

// A pointer variable supposed to point to an instance of the struct
struct mystruct *pointer;

// This is a general address represented by void*
void *addr = some_function(0);

// Cast that general address to a pointer varibale pointing to
// an instance of the struct
pointer = (struct mystruct *) addr;

// Use it!
printf("%d", pointer->a);

这篇关于在C更改结构的地址的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！