I want to get the memory address of an object. Can someone tell me how
to do that in C#. Also, I tried using the unsafe and the "&" operator
and could not acheive it. Can you tell me a good way of doing it? I am
new to this and have no clue how to get the memory address.
37  21658  I want to get the memory address of an object.
Why do you need it? In the garbage collected world of .NET it may
change from one moment to the next.
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Could you explain what are you trying to do. Why would you need "memory
address".
"kp******@gmail .com" wrote: I want to get the memory address of an object. Can someone tell me how
to do that in C#. Also, I tried using the unsafe and the "&" operator
and could not acheive it. Can you tell me a good way of doing it? I am
new to this and have no clue how to get the memory address.
We are in someway trying to create a unique id. Though I know we could
use Guid, my supervisors are advising me to use a logic to do it,
whereby the memory address of that instance of a class (object) is used
in this logic. Please help.
kp******@gmail. com wrote: We are in someway trying to create a unique id. Though I know we could
use Guid, my supervisors are advising me to use a logic to do it,
whereby the memory address of that instance of a class (object) is used
in this logic. Please help.
In .NET, you can pin an object and thus get hold of a pointer to it. I
don't know exactly what kind of objects you can pin, but I know you need
to use unsafe code to do it.
What's wrong with a Guid?
--
Lasse Vågsæther Karlsen http://usinglvkblog.blogspot.com/
mailto:la***@vk arlsen.no
PGP KeyID: 0x2A42A1C2
Unfortunately, your supervisors don't know much about .NET.
If you really want something that is unique for each object, you really
have no choice but to use a GUID (it's the easiest way to create something
that is guaranteed to be unique, and doesn't require a manager of your own
to synchronize generation of the unique values).
You would have to associate that guid with the object, and expose it
somehow. This would be best done through a method on your object itself.
If you store it outside your objects, then you will be holding references to
them (in order to do a lookup for the id based on the object) and that will
extend the lifetime of them (and force you to resort to some gnarly lifetime
management code).
You could use a hash, but that isn't guaranteed to generate a unique id
for each object instance.
Besides creating a unique id, what are you trying to do? What is the id
for?
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
<kp******@gmail .com> wrote in message
news:11******** *************@g 49g2000cwa.goog legroups.com... We are in someway trying to create a unique id. Though I know we could
use Guid, my supervisors are advising me to use a logic to do it,
whereby the memory address of that instance of a class (object) is used
in this logic. Please help.
"Memory addresses" in .NET aren't really static. Object can be moved around
as part of memory management. You can fix objects in memory, but I don't
think this is really a good solution to your problem.
If there's no other way to uniquely identify your objects, why not have a
static int which is simply incremented each time an object is created and
assigned to the object? Not much different than assigning a Guid in terms of
there not being any particular logic associated with the objects themselves.
Pete
<kp******@gmail .com> wrote in message
news:11******** *************@g 49g2000cwa.goog legroups.com... We are in someway trying to create a unique id. Though I know we could
use Guid, my supervisors are advising me to use a logic to do it,
whereby the memory address of that instance of a class (object) is used
in this logic. Please help.
Lasse,
This isn't completely correct. You don't need to use unsafe code to pin
an object reference. You can use the GCHandle structure to do it.
Also, this would be a very, very, very, VERY MONUMENTALLY BAD idea. If
you pin the object for a long period of time (and it would have to be, so
that the id remains unique), you will end up fragmenting the heap and make
the GC do WAY more work than it needs to.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Lasse Vågsæther Karlsen" <la***@vkarlsen .no> wrote in message
news:eb******** ************@te lenor.com... kp******@gmail. com wrote: We are in someway trying to create a unique id. Though I know we could
use Guid, my supervisors are advising me to use a logic to do it,
whereby the memory address of that instance of a class (object) is used
in this logic. Please help.
In .NET, you can pin an object and thus get hold of a pointer to it. I
don't know exactly what kind of objects you can pin, but I know you need
to use unsafe code to do it.
What's wrong with a Guid?
--
Lasse Vågsæther Karlsen
http://usinglvkblog.blogspot.com/
mailto:la***@vk arlsen.no
PGP KeyID: 0x2A42A1C2
"kp******@gmail .com" wrote: We are in someway trying to create a unique id. Though I know we could
use Guid, my supervisors are advising me to use a logic to do it,
whereby the memory address of that instance of a class (object) is used
in this logic. Please help.
Niether naturally implementable, nor a good idea. Convince your boss to use
a guid.
The address of an object in the GCed world is mutable and can change with
each successive GC pass. You can pin the address of an object in memory to
keep the GC from moving it, but this is only intended to be used briefly to
sent a pointer to un unmanaged codeblock because doing so will affect the
GCs performance.
As a sidebar question, if a GC pass opens a gap in the heap between the last
movable object and a pinned one with a higher address, does the heap fragment
like in the c/c++ world or is the free memory pointer placed after the pinned
object with the memory between the two temporarily unusable?
How much do your supervisors know about .Net? Did they give you a reason not
to use a Guid?
To use a memory address would be problematic and require unsafe coding. A
Guid is 128 bits in size. Now, the trade-off here is the expense of
resources to get (and use) the memory address, combined with the use of
unsafe code, balanced against using 128 bits of memory. Sounds like a
no-brainer to me. Therefore, I am led to strongly suspect that your
supervisors have no brains.
--
HTH,
Kevin Spencer
Microsoft MVP
..Net Developer
Big things are made up of
lots of little things.
<kp******@gmail .com> wrote in message
news:11******** *************@g 49g2000cwa.goog legroups.com... We are in someway trying to create a unique id. Though I know we could
use Guid, my supervisors are advising me to use a logic to do it,
whereby the memory address of that instance of a class (object) is used
in this logic. Please help. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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