C++ - 获取特定内存地址的值

问题描述

我想知道是否可以做这样的事情:

I was wondering whether it is possible to do something like this:

unsigned int address = 0x0001FBDC; // Random address :P
int value = *address; // Dereference of address

意思是，是否可以获取内存中特定地址的值?

Meaning, is it possible to get the value of a particular address in memory ?

谢谢

推荐答案

你可以而且应该这样写:

You can and should write it like this:

#include <cstdint>

uintptr_t p = 0x0001FBDC;
int value = *reinterpret_cast<int *>(p);

请注意，除非有某种保证 p 指向整数，否则这是未定义的行为.如果您尝试访问它不希望您访问的地址，则标准操作系统将终止您的进程.但是，这可能是独立程序中的常见模式.

Note that unless there is some guarantee that p points to an integer, this is undefined behaviour. A standard operating system will kill your process if you try to access an address that it didn't expect you to address. However, this may be a common pattern in free-standing programs.

(早期版本的 C++ 应该说 #include 和 intptr_t.)

(Earlier versions of C++ should say #include <stdint.h> and intptr_t.)

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