c# change variable memory address

Question

I have a specific address (let's call it ADR) in my memory with a specific value (let's assume 4 bytes int)

I want to crate an int variable in c# and change the address to that variable to ADR so when I do for example; print myVar it prints the value stored in ADR.

I know I can make an IntPtr(ADR) and then use Marshal Methods to get the value but I want a way to do this without calling a method everytime I have to read the value.

Thanks!!

I think the address of local variables is always somewhere on the stack, and the address of a field in an object is some offset from the address of the object. So I don't know of a type of "variable" for which you would be able to choose the address. — adv12
– adv12, Commented May 23, 2015 at 19:04

Lucas Trzesniewski · Accepted Answer · 2015-05-23 19:10:21Z

9

Did you know you can use pointers in C#?

int someVariable = 0;

unsafe
{
    int* addr = &someVariable;
    *addr = 42;
}

Console.WriteLine(someVariable); // Will print 42

If you already have an address you can just write:

int* addr = (int*)0xDEADBEEF;

Or, from an IntPtr:

var intPtr = new IntPtr(0xDEADBEEF);
int* addr = (int*)intPtr.ToPointer();

edited May 23, 2015 at 19:10

answered May 23, 2015 at 19:06

Lucas Trzesniewski

51.6k11 gold badges115 silver badges169 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Chris Over a year ago

Might also be worth noting that he'll have to tick Allow unsafe code for his project.

Mihai8 · Accepted Answer · 2015-05-23 19:10:53Z

0

One directly approach is invoking ASM code in your C# code, as you can see in Invoking Assembly Code in C#. Another appropriate option is to use pointers.

answered May 23, 2015 at 19:10

Mihai8

3,1471 gold badge23 silver badges33 bronze badges

Collectives™ on Stack Overflow

c# change variable memory address

2 Answers 2

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related