Cloning a window

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2 total messages Started by Old Wolf Mon, 29 May 2006 22:57

#3566

Author: Old Wolf
Date: Mon, 29 May 2006 22:57

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If I have the HWND of a top-level window, how can I create another identical window?

The reason for this is the same reason as you would create multiple instances of a TForm-derived dialog, although in this case I only have the HWND to work from.

I suppose I could create a new window with CreateWindowEx, and then recursively go through all of its child windows doing the same. But before I reinvent the wheel I would like to know if anybody has done this before.

Re: Cloning a window

#3567

Author: Remy Lebeau (TeamB)
Date: Tue, 30 May 2006 02:30

29 lines
1950 bytes

"Old Wolf" <oldwolf@inspire.net.nz> wrote in message
news:447b7c4f$1@newsgroups.borland.com...

> If I have the HWND of a top-level window, how can I create another
identical window?

You would have to recersively call GetClassName(), GetWindowLong(), etc to
gather information about the window and all of its child windows, and then
use CreateWindowEx() to recursively create and position new instances of
each one.  Even then, that only duplcates the parent/child hierarchy, but
there is no guarantee that the internal data of the windows can be copied so
that the clones actually function properly.

> The reason for this is the same reason as you would create multiple
instances
> of a TForm-derived dialog, although in this case I only have the HWND to
work from.

Just having the HWND is not enough to guarantee that you can clone
everything that matters.

> I suppose I could create a new window with CreateWindowEx, and then
> recursively go through all of its child windows doing the same.

That is all you can do.


Gambit

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