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From: ed@uunet!dtgcube (Edward Jung)
Newsgroups: comp.sys.next
Subject: Re: Multiple instantiation of windows laid out with IB
Message-ID: <1989Oct22.103111.26875@uunet!dtgcube>
Date: 22 Oct 89 10:31:11 GMT
References: <130030@gore.com>
Organization: The Deep Thought Group, L.P.
Lines: 40
In-Reply-To: jacob@gore.com's message of 21 Oct 89 21:36:33 GMT


>Is there a way to use the Interface Builder to set up a window, and then
>create an arbitrary number of copies of this window from the program, at
>run-time? 

Yes, you can do that with Interface Builder.  Instructions on how to do
it are in the Interface Builder chapter dealing with a multi-window
editor (Project 4, Chapter 8, pp.47 in the on-line manual
/NextLibrary/Documentation/NeXT/SysRefMan/08_IntfBuilder.wn).
The instructions are relatively straight-forward.

There are also other ways:

You might be tempted to use the message 'copy' to make a copy of the
objects, but avoid this.  'copy' makes an exact copy, including all
*references* to other objects (rather than copying those objects), which
is ALMOST CERTAINLY NOT what you want.  Instead, use typed streams to
copy objects:

	#import <objc/typedstream.h>
	id copyObject(id baseObject)
	{
	    id returnValue;
	    int length;
	    char * buffer = NXWriteRootObjectToBuffer(baseObject, &length);
	    returnValue = NXReadObjectFromBuffer(buffer, length);
	    /* error checking here */
	    NXFreeObjectBuffer(buffer, length);
	    return returnValue;
	}

This writes out a graph of the object and then reads it back in, all in
memory.

Hope this helps.
-- 
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Edward Jung			     The Deep Thought Group, L.P.
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