Assing address to pointer

[Vlad]

In the following code:

unsafe class X
{
byte* _address;
void test()
{
_address=(byte* )144220152;
}

}

Why the watch windows shows a differtent address for _address variable
?

[Nicholas Paldino [.NET/C# MVP]]

Re: Assing address to pointer

Vlad,

Are you sure you are not looking at the hexidecimal format for the
number? Does it show you 8989FF8 instead (this is the same value in hex
format)?

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"Vlad" <a.sasanelli@gm ail.com> wrote in message
news:1136819524 .606200.148700@ o13g2000cwo.goo glegroups.com.. .[color=blue]
> In the following code:
>
> unsafe class X
> {
> byte* _address;
> void test()
> {
> _address=(byte* )144220152;
> }
>
> }
>
> Why the watch windows shows a differtent address for _address variable
> ?
>[/color]

[Vlad]

Re: Assing address to pointer

Thanks for your help, but the problem isn't hexidecimal format

[Nicholas Paldino [.NET/C# MVP]]

Re: Assing address to pointer

Vlad,

Well, I changed the _address field and the test method to be public, and
then wrote the value of _address out to the console after I ran test. The
value was the same.

There must be something else changing it which is not shown in the code
that you posted.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"Vlad" <a.sasanelli@gm ail.com> wrote in message
news:1136819524 .606200.148700@ o13g2000cwo.goo glegroups.com.. .[color=blue]
> In the following code:
>
> unsafe class X
> {
> byte* _address;
> void test()
> {
> _address=(byte* )144220152;
> }
>
> }
>
> Why the watch windows shows a differtent address for _address variable
> ?
>[/color]

[Willy Denoyette [MVP]]

Re: Assing address to pointer


"Vlad" <a.sasanelli@gm ail.com> wrote in message
news:1136819524 .606200.148700@ o13g2000cwo.goo glegroups.com.. .
| In the following code:
|
| unsafe class X
| {
| byte* _address;
| void test()
| {
| _address=(byte* )144220152;
| }
|
| }
|
| Why the watch windows shows a differtent address for _address variable
| ?
|

_address is located on the stack and it's a pointer so the stack location
will hold the value you set by _address=(byte* )144220152;
To find the value of byte* you'll have to look at the contents of this
location.

Willy.

[Vlad]

Re: Assing address to pointer

I change the question: What is the largest address that I can assign
to pointer ?

[Vlad]

Re: Assing address to pointer

I know, I'm interested at the address of pointer rather the value

[Willy Denoyette [MVP]]

Re: Assing address to pointer


"Vlad" <a.sasanelli@gm ail.com> wrote in message
news:1136887745 .168673.264020@ o13g2000cwo.goo glegroups.com.. .
|I know, I'm interested at the address of pointer rather the value
|

What do you mean by that?

_address is a variable located on the stack, you set the contents of this
location to 144220152 by this assignment:

_address=(byte* )144220152; // set _address to 0x08989ff8

So suppose your _address is at 0x00125604; after the assignment, the int
value at 0x00125604 will contain 0x08989ff8.
Note that the value will be DWORD swapped, so the debugger will show
0xf89f9808.

Willy.

[Willy Denoyette [MVP]]

Re: Assing address to pointer


"Vlad" <a.sasanelli@gm ail.com> wrote in message
news:1136887569 .023453.272160@ g44g2000cwa.goo glegroups.com.. .
|I change the question: What is the largest address that I can assign
| to pointer ?
|

The largest user address on 32 bit windows is 0x7fffffff (decimal
2147483647), note that while you can point to anything between 0 and
0x7fffffff in your address space, it does not mean that read or write
from/to anything. What exactly are you trying to achieve.

Willy.

[Vlad]

Re: Assing address to pointer


Thanks for your patience this is the last post in the thread
It's wrong think that the following code in c# are equivalent?


byte* p;
p=someAddress

----------------------------------------------------
IntPtr p=new IntPtr(someAddr ess)


The pointers are address container?

[Willy Denoyette [MVP]]

Re: Assing address to pointer


"Vlad" <a.sasanelli@gm ail.com> wrote in message
news:1136911662 .660437.284370@ g43g2000cwa.goo glegroups.com.. .
|
| Thanks for your patience this is the last post in the thread
| It's wrong think that the following code in c# are equivalent?
|
|
| byte* p;
| p=someAddress
|
| ----------------------------------------------------
| IntPtr p=new IntPtr(someAddr ess)
|
|
| The pointers are address container?
|

More or less;
case1: p is a variable that holds a pointer that points to a byte.
case2: p is a variable that holds a pointer to a void type.

Willy.