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unable to recreate a pointer
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rogerdpack  
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 More options Feb 23 2010, 4:49 pm
From: rogerdpack <rogerdp...@gmail.com>
Date: Tue, 23 Feb 2010 13:49:21 -0800 (PST)
Local: Tues, Feb 23 2010 4:49 pm
Subject: unable to recreate a pointer
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In this code:

http://pastie.org/839395

I read in an HWND, attempt to copy it, and use the copy.  However, the
copy doesn't seem to work.
Anyone have any insights here?
Thanks.
-rp


 
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rogerdpack  
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 More options Feb 26 2010, 7:43 pm
From: rogerdpack <rogerpack2...@gmail.com>
Date: Fri, 26 Feb 2010 16:43:07 -0800 (PST)
Local: Fri, Feb 26 2010 7:43 pm
Subject: Re: unable to recreate a pointer
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> http://pastie.org/839395

> I read in an HWND, attempt to copy it, and use the copy.  However, the
> copy doesn't seem to work.

So it appears the problem is that doing a
(HWND).read_int

isn't allowed by windows at all...

a HANDLE maybe is like a pointer into some deep dark internal
(unreadable, unwritable) windows memory structure.

It's a "special" pointer.  It's not what it points to that matters,
but rather that you are pointing to the "right" location.

As a work around you can specify long's for HWND and it works great.
Either that or at least don't try to copy them :)

The only way to copy them (if you're using pointers) is like

new_pointer = FFI::Pointer.new (Top.GetForegroundWindow.address)

Thanks for your patience.

-r


 
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Wayne Meissner  
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 More options Feb 26 2010, 10:51 pm
From: Wayne Meissner <wmeiss...@gmail.com>
Date: Sat, 27 Feb 2010 13:51:11 +1000
Local: Fri, Feb 26 2010 10:51 pm
Subject: Re: [ruby-ffi] Re: unable to recreate a pointer
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On 27 February 2010 10:43, rogerdpack <rogerpack2...@gmail.com> wrote:

> a HANDLE maybe is like a pointer into some deep dark internal
> (unreadable, unwritable) windows memory structure.

> It's a "special" pointer.  It's not what it points to that matters,
> but rather that you are pointing to the "right" location.

> As a work around you can specify long's for HWND and it works great.
> Either that or at least don't try to copy them :)

> The only way to copy them (if you're using pointers) is like

> new_pointer = FFI::Pointer.new (Top.GetForegroundWindow.address)

So, the question is, why are you trying to do this at all?

What is the use case where this causes problems?

fg_window = Top.GetForegroundWindow
new_pointer = fg_window


 
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Arvicco  
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 More options Feb 23 2010, 9:24 pm
From: Arvicco <arvitall...@gmail.com>
Date: Tue, 23 Feb 2010 18:24:08 -0800 (PST)
Local: Tues, Feb 23 2010 9:24 pm
Subject: Re: unable to recreate a pointer
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Since HWND represents window handle (which is never used for pointer
operations),
I just declare it as :ulong and never bother to do any pointer
gymnastics around it.
Everything seems to work well with this approach so far.

Regards,
Arvicco

On Feb 24, 12:49 am, rogerdpack <rogerdp...@gmail.com> wrote:


 
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