Accessing direct memory addresses and obtaining the values in C++

Question

I was wondering if it was possible to access a direct block of memory using C/C++ and grab the value. For example:

int i = 15;
int *p = &i;
cout <<         


        

Answer 1

In general, it's not usually possible for one program to modify the memory of another. The system goes to great lengths to ensure this. If it did not, no program would be safe. This is particularly true in all the Unix variants I've worked on, though not on all proprietary OSes I've seen.

Note that none of these rules apply to the kernel ...

There is also a programming paradigm called shared memory, but you have to explicitly set that up.

Short answer: you can't usually do that. I believe you mentioned windows. I know nothing about Windows, so your mileage may vary.