Pointers, Classes, Objects ...

[Tambi]

How can I get an object address as IntPtr ?
Somehow even in unsafe it's not working with objetcs...

I'am trying to compare two objects that are not the same but could be from
some point.

Example :

Let say we have two classes one derived from another

public class A
{
protected h=0;

public virtual func()
{
h=0;
}
}

public class B:A
{
public override func()
{
h=1;
}
}
I created two instance of these classes obj1 and obj2,

obj1=Activator.CreateInstance(t1); //Type t1; class A
obj2=Activator.CreateInstance(t2); //Type t2; class B

After invoking we can see in the debugger somthing like this...

obj1.A.h=0
obj2.B.A.h=1;

I dont whant to compare fieald by GetFieald() and comparing them one by one,
My idea was to try the Marshal.ReadIntPtr(IntPtr,offset) so I can read obj2
after some offset, So I needed my variable Address. (somehow even in unsafe
we cant do object *p=obj1; on objetcs...)

I tried Marshel.ReadByte and it's not working cause my object type could be
anything...
Anyone have some idea ???

Thanks

[Mattias Sjögren]

I'am trying to compare two objects that are not the same but could be from
some point.
You can see if two variables refer to the same object with

if ( (object)obj1 == (object)obj2 )

or

if ( Object.ReferenceEquals( obj1, obj2 ) )

No need to involve pointers.

obj1=Activator.CreateInstance(t1); //Type t1; class A
obj2=Activator.CreateInstance(t2); //Type t2; class B

If you allocate two objects they will always be in different locations
in memory (with the exception of interned strings).

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
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[Tambi]

Simple comparison like this won't work couse they can be similar only after
some offsetting... if ...

obj1.A.h=0
obj2.B.A.h=1;

I will need to bring them to ...

A.h=0 //obj1
A.h=1 //obj2

So ... still I will need the object pointer.

[Mattias Sjögren]

Why don't you just write a comparison method that compares the fields,
what's wrong with that? You could possibly implement IComparable for
this.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.